Southern Ontario: School Bus Cancellations and Closures for Friday, December 19, 2025

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Cancellation & Closure Map (English Public and Catholic Schools)

Please note: School board boundaries are a rough estimate. Don’t use this map to determine what school board or weather zone you live in as accuracy isn’t guaranteed.

• Green = No Cancellations

• Red = Cancellations (Click for More Details)

• Purple = School Closures (Click for More Details)

List of Cancellations & Closures

English Public and Catholic Schools

• Avon MaitIand Public & Huron-Perth CathoIic: There are several closures/cancellations, please visit this link for more details: https://hpsts.mybusplanner.ca/Alerts

• BIuewater Public & Bruce-Grey Catholic: All busses are cancelled.

• Dufferin-PeeI Catholic: Buses to St. Andrew, St. Peter, St. Benedict as well as ALL buses to Robert F. Hall CSS are cancelled today due to weather and road conditions.

• Kawartha Pine Ridge Public & Peterborough Victoria Northumberland Clarington Catholic: Bus and transportation service is cancelled to ALL schools in the STSCO jurisdiction for the day.

• Near North Public & Nipissing-Parry Sound CathoIic: Bussing for all weather corridors are cancelled today.

• Rainbow Public & Sudbury Catholic: All school related transportation services operating in the districts of SUDBURY, ESPANOLA, MASSEY AND MANITOULIN are cancelled today.

• Simcoe County Public & Simcoe Catholic: Busses are cancelled for Muskoka.

• Thames Valley Public & London CathoIic: Busses are cancelled today for Middlesex, Oxford, and Elgin Counties and Red Zone.

• Trillium Lakelands: All school vehicles to schools in all Zones for Trillium Lakelands District School Board have been cancelled.

• Upper Grand Public & Wellington CathoIic: All busses in Divisions 2, 3, and 4 are cancelled today.

French Schools

• Conseil catholique MonAvenir: Busses are cancelled for schools in Peterborough.

• Conseil scolaire catholique Providence: Busses are cancelled for Oxford, Middlesex, and Bruce-Grey.

• Conseil scolaire public du Grand Nord de l’Ontario (CSPGNO): All school related transportation services operating in the districts of SUDBURY, ESPANOLA, MASSEY AND MANITOULIN are cancelled today.

• Le Conseil scolaire public du Nord-Est de l’Ontario (CSPNE) & Conseil scolaire catholique Franco-Nord: Bussing for all weather corridors are cancelled today.

‘Snow Day’ Forecast: Icy Conditions Could Give Some Students an Early Start to Holiday Break Across Southern Ontario on Friday

For an updated list of school bus cancellations & school closures, please visit our live article: https://instantweatherinc.com/article/2025/12/19/bus-cancellations

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A messy roller coaster of weather is expected across Southern Ontario throughout the day on Friday. It will begin with rain overnight, switching over to heavy snow right around the height of the morning commute. Temperatures will then plunge quickly, leading to the development of icy conditions.

To make things even more complicated, lake effect snow is expected to redevelop east of Lake Huron and Georgian Bay later in the day, with locally 10 to 20 cm of snow possible by Friday evening.

With the rain changing to snow, lining up with the morning commute and temperatures dropping through the freezing mark, there is potential for school bus cancellations, especially in rural areas.

The temperature drop is expected to be fairly gradual, which makes it uncertain whether Environment Canada will issue flash freeze warnings. That uncertainty also makes it harder to determine whether conditions will reach the threshold needed for widespread cancellations.

Our highest confidence lies in two regions that tend to be more sensitive to winter weather due to the large number of rural routes they serve. These include the North Hastings zone under Tri-Board Student Transportation Services and the Parry Sound and East Parry Sound regions within the Near North District School Board.

We have assigned these areas a 75 percent chance of bus cancellations. At this point, we are leaning toward cancellations, but not strongly enough to support a higher probability.

Across the broader rural portions of Central, Eastern and Southwestern Ontario, we have assigned a 50 percent chance of school bus cancellations, as conditions could easily go either way. We do expect several cancellations within this widespread zone.

This includes areas covered by the Avon Maitland District School Board, the Trillium Lakelands District School Board, North Bay under the Near North District School Board, Peterborough County within the Kawartha Pine Ridge District School Board, and much of Tri-Board Student Transportation Services. Kingston and Prince Edward County under Tri-Board sit lower at 25 percent. This zone also includes the Madawaska region within the Renfrew County District School Board.

Outside of these areas, there is still a slight chance of cancellations, although we are leaning toward buses running in most cases. As such, we have assigned a 25 percent chance to Lambton and Chatham-Kent within the Lambton Kent District School Board, Middlesex and Oxford counties under the Thames Valley District School Board, Dufferin and Wellington counties within the Upper Grand District School Board, the Simcoe West and Simcoe North weather zones, as well as the remaining portions of the Renfrew County District School Board and the Upper Canada District School Board.

For the rest of Southern Ontario, which is largely covered by more urban school boards, cancellations are unlikely. This includes Windsor under the Greater Essex County District School Board, London and Waterloo under the Thames Valley District School Board and Waterloo Region District School Board, the Greater Toronto Area including Toronto, Peel, York, Durham and Halton, the Simcoe Central and Simcoe South zones, and the Ottawa region.

Conditions in these areas are not expected to meet typical cancellation thresholds. Still, we have assigned a small 5 to 10 percent chance to account for the possibility of a few surprise decisions if icy conditions become more impactful than currently expected.

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Disclaimer: Instant Weather has zero authority when it comes to bus and school closures.

It is completely up to the school boards, bus companies, local authorities, and parents to decide what is best for their children. This is our best guess based on our forecast.

Southern Ontario: ‘Snow/Ice Day’ Forecast for Thursday, December 18, 2025

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No major winter weather is expected across Southern Ontario on Thursday, and because of this, widespread school bus cancellations are unlikely.

That said, many areas have seen temperatures climb above freezing during the day on Wednesday, followed by an expected drop back below freezing later tonight and into early Thursday morning. This setup could allow for some localized icy conditions to develop, especially on rural roads.

Because of this possibility, we have assigned a widespread low to very low chance for an “ice day” across parts of Central and Eastern Ontario, as well as higher elevation areas of Southwestern Ontario.

We are not expecting cancellations, but if back roads become icy enough in a few localized spots, a surprise decision cannot be completely ruled out.

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Disclaimer: Instant Weather has zero authority when it comes to bus and school closures.

It is completely up to the school boards, bus companies, local authorities, and parents to decide what is best for their children. This is our best guess based on our forecast.

Southern Ontario: ‘Snow/Ice Day’ Forecast for Wednesday, December 17, 2025

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Patchy freezing drizzle or light freezing rain is expected to develop across portions of Southwestern, Central and Eastern Ontario overnight Tuesday and into Wednesday morning.

While this freezing rain risk is not expected to be particularly impactful or widespread, it could still lead to a thin glaze of ice forming on untreated surfaces. This includes rural roads, sidewalks and vehicles, especially in areas where temperatures hover near the freezing mark through the night.

At this time, conditions are not expected to reach the threshold that would normally prompt widespread school bus cancellations. However, we cannot completely rule it out, especially if Environment Canada issues advisories overnight or if the freezing rain ends up being more widespread than currently forecast.

The most likely region to see an “ice day” is the North Hastings zone within Tri-Board Student Transportation Services. This area has a long history of being particularly cautious, largely due to its extensive network of rural routes where back road conditions can deteriorate quickly, even during relatively minor icing events. We have assigned this region a 25 percent chance to reflect that slightly elevated risk, though the overall lean remains toward buses running without major issues.

Elsewhere across the rural portions of Eastern, Central and Southwestern Ontario, we have assigned a low 5 to 10 percent chance of cancellations. Most school boards are expected to operate normally on Wednesday, but a few localized decisions cannot be ruled out depending on overnight road conditions.

This includes areas covered by Tri-Board, the Renfrew County District School Board, the Upper Canada District School Board, the Kawartha Pine Ridge District School Board, the Trillium Lakelands District School Board, the Near North District School Board, the Simcoe County District School Board, the northern portion of the Durham District School Board, the Upper Grand District School Board, the Bluewater District School Board and the Avon Maitland District School Board.

Outside of these regions, no weather-related school bus cancellations are expected on Wednesday. So for now, it looks like homework remains on the schedule.

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Disclaimer: Instant Weather has zero authority when it comes to bus and school closures.

It is completely up to the school boards, bus companies, local authorities, and parents to decide what is best for their children. This is our best guess based on our forecast.

ONTARIO: Environment Canada Forecasting Snow, Flash Freezing, Heavy Rain, Strong Winds and Extreme Cold This Week

A very active stretch of weather is expected across Ontario this week, with strong winds, snow, blowing snow, ice, heavy rain, and extreme cold all making appearances. Below is a day-by-day breakdown summary based on the latest Environment Canada forecast.

Tuesday, December 16:

- Strong southwest winds gusting up to 70 km/h for areas northeast of Lake Superior, Lake Huron and Georgian Bay, including parts of Manitoulin Island.

- Risk of flash freeze in northwestern Ontario as temperatures drop quickly, creating hidden ice on roads and walkways.

- Winds ease by late Tuesday night into early Wednesday.

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Wednesday, December 17:

- Significant wind chills near -40°C in far northwestern Ontario.

- Strong winds along the northeastern shores of Lake Erie and Lake Ontario, with gusts up to 80 km/h.

- Brief burst of snow and blowing snow across northeastern Ontario as a cold front sweeps through.

- Snow spreads into northwestern Ontario later in the day and continues overnight.

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Thursday, December 18:

- Strengthening low-pressure system brings 20–30 cm of heavy snow north of Lake Superior toward the Quebec border.

- Additional 5–15 cm of snow across northern Ontario.

- 15–25 mm of rain in southern Ontario on frozen ground, increasing localized flooding risk.

- Rain transitions to snow Thursday evening as temperatures fall.

- Extreme wind chills near -45°C in far northwestern Ontario.

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Friday, December 19:

- A flash freeze risk across southern Ontario during the morning commute as temperatures plunge.

- Snow squalls east of Lake Huron and Georgian Bay may deliver 5‑15 cm of snow and create near-zero visibility at times.

- Additional 5‑10 cm of snow possible across northeastern Ontario.

- Extreme wind chills of -40 to -45°C persist across northwestern and far northern Ontario.

- Continued risk of frostbite and hypothermia due to the bitter cold in the northwest.

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Long story slightly longer, a prolonged stretch of active weather is expected with high winds, snow, flash freezing, rain and extreme cold affecting different parts of Ontario. Stay safe and warm, everyone and make sure to download our free app InstantWeather to get the most up-to-date, detailed forecast for your specific location.

Southern Ontario: ‘Snow Day’ Forecast for Tuesday, December 16, 2025

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We are expecting a fairly quiet day weather-wise on Tuesday across Southern Ontario, with no major weather in place to cause widespread travel issues.

Because of this, there is nothing in the forecast that would suggest a strong likelihood of school bus cancellations.

The only area with any notable chance is the Parry Sound region under the Near North District School Board, where a snow squall warning remains in effect. That activity is expected to weaken overnight, making it questionable whether it will have any meaningful impact on the morning commute.

Even so, given this school board’s history of being particularly sensitive to weather conditions, we cannot completely rule out a surprise decision. As a result, we have assigned Parry Sound a 10 percent chance.

Outside of the Parry Sound area, no weather-related school bus cancellations are expected on Tuesday.

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Disclaimer: Instant Weather has zero authority when it comes to bus and school closures.

It is completely up to the school boards, bus companies, local authorities, and parents to decide what is best for their children. This is our best guess based on our forecast.

Southern Ontario: ‘Snow Day’ Forecast for Monday, December 15, 2025

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After an active weekend that featured periods of snow squall activity across portions of Southern Ontario’s snowbelt, conditions are expected to steadily improve later Sunday evening as the lake effect weakens and winds begin to ease.

Because of this, there are no major weather concerns expected overnight that would normally keep school buses off the roads on Monday. Most regions should see calmer conditions by the time the morning bus run begins.

That said, we cannot completely rule out a few isolated cancellations tied to lingering blowing snow and rural roads that may remain snow covered following Sunday’s squalls. Any issues would be highly localized and mainly confined to areas that saw the most persistent snowfall.

If cancellations do occur, they would most likely be found in Huron County under the Avon Maitland District School Board, Middlesex County within the Thames Valley District School Board, and Lambton County for the Lambton Kent District School Board.

We have assigned these regions a 25 percent chance of a snow day on Monday to account for the potential for rural route issues. Widespread cancellations are not expected.

Elsewhere across the snowbelt, we have maintained a low to very low chance simply to account for the outside possibility of a surprise decision.

If a surprise cancellation does occur outside of the regions mentioned above, the most likely candidate would be the Near North District School Board. Some light snow and lake effect activity may redevelop there later in the day, and this board has a history of being proactive when Environment Canada issues alerts. If any alerts are in place by early Monday morning, some cancellations are possible.

For the rest of Southern Ontario, no school bus cancellations are expected on Monday. So for now, it looks like homework is back on the menu.

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Disclaimer: Instant Weather has zero authority when it comes to bus and school closures.

It is completely up to the school boards, bus companies, local authorities, and parents to decide what is best for their children. This is our best guess based on our forecast.

Southern Ontario’s Never-Ending Winter Continues This Weekend as Squalls Threaten to Bring Up to 50cm of More Snow

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With a steady parade of system after system, along with lake effect snow in between, it’s certainly understandable that some parts of Southern Ontario are getting pretty fed up with all the snow. The snow continues to pile up, especially across the snowbelt regions!

It was only a few days ago that the Barrie area was slammed with intense lake effect snow, with up to 70cm reported in the hardest hit community of Angus. And that doesn’t even include what was already on the ground before this round of squalls moved through.

Regions east of Lake Huron, including Grey, Bruce, Huron and Perth counties, have also seen their fair share of snow so far this winter, with frequent lake effect events adding to an already deep snowpack.

Fortunately for snow lovers, and perhaps unfortunately for everyone else, the squalls are far from finished. The lakes remain wide open, and we are just getting into the heart of colder Arctic air. That combination will continue to provide plenty of fuel for additional rounds of lake effect snow in the coming weeks.

The next round of squalls is just around the corner, with activity expected to ramp up again as early as Saturday morning. The good news for areas that were recently hammered by the Georgian Bay squall, including Barrie and Wasaga Beach, is that you should catch a bit of a break this weekend. The bulk of the activity will focus farther north and west.

Those east of Lake Huron, including Huron, Bruce and Grey counties, are not as lucky. Lake effect snow off Lake Huron is expected to target these areas once again with repeated rounds of snow through the weekend.

This is shaping up to be a multi-day lake effect event, with squalls persisting through the weekend and possibly into Monday. Winds are expected to be somewhat unstable, which means the squalls will tend to drift around rather than remain locked over one specific area. Because of this, it’s unlikely we’ll see extreme localized totals like the 50 to 75cm that fell southwest of Barrie earlier this week.

That said, snowfall totals will still add up. The hardest hit areas, including Parry Sound, Bracebridge, Tobermory, Owen Sound, Hanover, Collingwood, Goderich and Grand Bend, can generally expect 25 to 40cm. Some pockets, particularly across Muskoka, could push closer to the 50cm mark.

PRECIP TYPE - MAP FROM WEATHERBELL

The event is expected to get underway early Saturday morning as a brief southwesterly wind develops. A weak system moving through the region will become enhanced by the lakes, producing short bursts of heavy snow.

This could impact areas northeast of Georgian Bay as well as regions northeast of Lake Erie and Lake Ontario. Places like Parry Sound, North Bay, Niagara and Kingston could see a quick 5 to 10cm early Saturday morning, along with near-zero visibility at times.

Hourly snowfall rates (cm) - MAP FROM WEATHERBELL

As that system exits, winds will become more westerly, shifting the focus back to Georgian Bay and Lake Huron through Saturday afternoon and evening.

Current model guidance shows a fairly potent and narrow band setting up near the northern tip of the Bruce Peninsula, stretching across Georgian Bay and coming inland near Port Carling and Bracebridge. Keep in mind that even small shifts in wind direction could push the heaviest snow several dozen kilometres north or south.

Very poor to hazardous driving conditions are expected along the Highway 400 and Highway 11 corridors in this area. Highway closures are not out of the question, especially given how quickly conditions can deteriorate.

Additionally, somewhat weaker bands are also expected to develop off Lake Huron, impacting the Owen Sound to Goderich corridor. There remains uncertainty regarding exactly where these bands will set up and whether they consolidate into a more dominant squall.

Hourly snowfall rates (cm) - MAP FROM WEATHERBELL

Later Saturday, a subtle wind shift will cause the main Georgian Bay squall affecting Muskoka to briefly drift south into Simcoe County. This could bring a short period of heavy snow overnight Saturday to Midland, Orillia and Barrie. Accumulation here should be limited, generally around 5 to 10cm, as the squall will be moving through fairly quickly.

A similar evolution will occur east of Lake Huron, with the squall drifting from Tobermory down through the Bruce Peninsula and into southern Bruce and Grey counties overnight. This activity will continue as the squall settles farther south and west of London under a more north-northwest flow.

PRECIP TYPE - MAP FROM WEATHERBELL

By Sunday morning, the strongest lake effect activity is expected to be found off Lake Huron, affecting the Grand Bend to London corridor. At this point, it appears the core of the squall should remain just west of London, impacting areas like Strathroy, though brief pushes into the city are still possible.

The Georgian Bay squall will temporarily weaken as winds become less favourable for a strong lake fetch. This should restrict activity mainly to shoreline areas near Meaford and Collingwood for a time.

Hourly snowfall rates (cm) - MAP FROM WEATHERBELL

That break will be short-lived. By Sunday evening, increasing winds will allow lake effect snow off Georgian Bay to intensify once again. Some models show moderate to heavy snow developing from Meaford through Collingwood and extending toward the Orangeville region overnight, before the lake effect machine is shut down by an approaching system on Monday morning.

Lake Huron squalls will continue through this time, remaining heavy at times across Huron County, Grand Bend and areas west of London. As with earlier periods, most of the heaviest snow should stay just to the west of the city.

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Because the squalls will be shifting around, snowfall will be more evenly distributed across a wider area. We aren’t expecting extremely high localized totals, but many communities will still share in the heavy snowfall. By the end of the weekend, most areas east of Lake Huron and Georgian Bay could see totals ranging from 25 to 50cm.

The usual lake effect disclaimer applies. Some locations will inevitably end up just outside the heaviest bands, but the contrast should be less dramatic this time since most snowbelt areas will be impacted at some point.

The main target zones include areas east of Georgian Bay, such as Parry Sound, Rosseau, Port Carling, Bracebridge and Port Sydney, along with much of Bruce, Grey, Huron and Middlesex counties east and southeast of Lake Huron. This includes communities like Tobermory, Wiarton, Lion’s Head, Owen Sound, Meaford, Collingwood, Flesherton, Hanover, Chatsworth, Port Elgin, Kincardine, Mildmay, Point Clark, Wingham, Goderich, Clinton, Exeter, Lucan, Grand Bend and Strathroy.

Snowfall totals will drop off quickly outside of these regions, as lake effect snow remains highly localized. However, as mentioned earlier, a brief 5 to 10cm is still possible Saturday morning for parts of Niagara and the Kingston area due to lake-enhanced snow from the passing system.

For the rest of Southern Ontario, expect around 2 to 5cm from that system on Saturday, with most locations likely closer to the lower end of that range outside of the snowbelt.

Southern Ontario: ‘Snow Day’ Forecast for Friday, December 12, 2025

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Snow squalls that remained locked in place east of Lake Huron and southeast of Georgian Bay brought a second straight snow day to many students across the snowbelt, with school buses cancelled both Wednesday and Thursday. But for anyone hoping to turn this into a rare three-day streak and stretch the weekend a little further, the chances are not looking nearly as promising.

Through Thursday evening, the squalls have already begun to weaken, with intensity dropping off compared to earlier in the day. That downward trend is expected to continue overnight as winds ease and the lake effect snow machine gradually winds down. By morning, conditions should look much calmer, at least in terms of new snowfall.

However, despite the improvement in weather, many communities have spent the past 12 to 24 hours getting buried in persistent snow squalls. Road crews will be working hard overnight, but in the hardest-hit areas, it is unlikely that every rural route will be fully cleared by the time the morning bus run begins. Even without active squalls on Friday morning, the snow already on the ground may be enough for some school boards to consider keeping buses off the road for a third day.

Confidence in widespread cancellations is not particularly high, so we have capped the maximum at a 50 percent chance. This zone includes Huron County under the Avon Maitland District School Board, southern Bruce County within the Bluewater District School Board, and the Simcoe West zone under the Simcoe County District School Board. These regions experienced the most persistent squall activity today, and their large number of rural routes increases the likelihood that cleanup may not be fully completed by morning.

Outside this core area, a slight chance (25 percent) has been assigned to several surrounding regions. This includes Middlesex and Oxford counties within the Thames Valley District School Board, Perth County for AMDSB, the remainder of Bluewater, including northern Bruce County and all of Grey County, as well as Simcoe Central and Simcoe South. While buses should be able to run in most of these locations, the final decision will depend heavily on how effective overnight cleanup efforts are. Simcoe’s Central and South zones are also more urban, and historically, these areas require more severe conditions before cancellations are considered.

For the remainder of Southern Ontario, a snow day on Friday appears unlikely. Most regions fall into the very low to low category, with no significant weather expected overnight or Friday morning that would normally prompt cancellations. Unless there are unexpected localized issues left behind from today’s squalls, most students should plan for a regular school day.

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Disclaimer: Instant Weather has zero authority when it comes to bus and school closures.

It is completely up to the school boards, bus companies, local authorities, and parents to decide what is best for their children. This is our best guess based on our forecast.

Southern Ontario: School Bus Cancellations and Closures for Thursday, December 11, 2025

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Cancellation & Closure Map (English Public and Catholic Schools)

Please note: School board boundaries are a rough estimate. Don’t use this map to determine what school board or weather zone you live in as accuracy isn’t guaranteed.

• Green = No Cancellations

• Red = Cancellations (Click for More Details)

• Purple = School Closures (Click for More Details)

List of Cancellations & Closures

English Public and Catholic Schools

• Avon MaitIand Public & Huron-Perth CathoIic: There are multiple closures/cancellations, please visit this link for more details: https://hpsts.mybusplanner.ca/Alerts

• BIuewater Public & Bruce-Grey Catholic: All busses are cancelled.

• Kawartha Pine Ridge Public & Peterborough Victoria Northumberland Clarington Catholic: all busing and school transportation is cancelled today for all of the STSCO jurisdiction

• Renfrew County Public & Renfrew County Catholic: Zone 4 Madawaska area transportation services ONLY are cancelled due to observed poor road conditions.

• Simcoe County Public & Simcoe Catholic: Busses are cancelled for the West, Central, and South Zones.

• Thames Valley Public & London CathoIic: Busses are cancelled and schools are CLOSED for Middlesex, Oxford, and Elgin Counties, and Red Zone.

• Tri-Board: transportation is cancelled in North Hastings, Centre Hastings, North Lennox & Addington, Central Lennox & Addington, North & Central Frontenac and South Frontenac weather zones today.

• Upper Canada Public & Eastern Ontario CathoIic: All transportation is cancelled due to forecasted severe weather and road conditions.

French Schools

• Conseil des écoles publiques de l’Est de l’Ontario (CEPEO): Busses are cancelled for Brockville, Carleton Place, Arnprior, Prescott-Russell, Marionville, and Merrickville & Kemptville

• Conseil catholique MonAvenir: Busses are cancelled for schools in Simcoe and Peterborough

• Conseil scolaire de district catholique de l'Est Ontarien (CSDCEO): All busses are cancelled

• Conseil des écoles catholiques de langue française du Centre-Est: Busses are cancelled for Brockville, Carleton Place, Arnprior, Prescott-Russell, Marionville, and Merrickville & Kemptville

• Conseil scolaire catholique Providence: Busses are cancelled for Simcoe West, Central, and South Zones, Oxford, Middlesex rural routes, and Bruce-Grey

• Conseil scolaire Viamonde: Busses are cancelled for Simcoe West, Central, and South Zones, Oxford, Middlesex rural routes, and Bruce-Grey

Barrie Area to Be Buried in Up to 40 to 75 cm of Snow on Thursday as Arctic Air Fuels Dangerous Snow Squalls

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Snowfall from the Alberta Clipper that slid through Southern Ontario earlier on Wednesday is beginning to taper off. The system has left its mark across the region with a widespread 10 to 20cm of snow in some areas, while others saw a slushy mix.

While the clipper may be done, the snowfall story is not. As the system pulls away, it ushers in a polar blast of cold air overnight on Wednesday. This air, combined with strong northwesterly winds, will kick the lake effect snow machine back into gear off Lake Huron and Georgian Bay.

Intense snow squalls across Simcoe, Huron and Perth counties throughout Thursday are likely to create dangerous conditions. Frigid wind chills paired with near-zero visibility will make travel extremely difficult and even life-threatening if you become stranded.

The Georgian Bay squall is expected to be particularly intense. A narrow corridor from Wasaga Beach through southwest Barrie, including Angus, Innisfil and into Bradford, may see the band lock in place for more than six hours. Snowfall rates could exceed 5cm per hour.

Localized totals around the Barrie area could approach 50 to 75cm in the hardest hit pocket. Some high resolution models even suggest 100cm is not completely off the table.

East of Lake Huron, activity will be persistent from Thursday morning through the evening. The lake effect here appears more spread out rather than focused on one specific pocket. The heaviest totals are expected across Huron and Perth counties, where up to 50cm is locally possible.

PRECIP TYPE - MAP FROM WEATHERBELL

As of Wednesday evening, we are already seeing some activity begin ramping up off the southeast shoreline of Lake Huron and Georgian Bay. This will continue to organize after midnight into the early hours of Thursday.

By early morning, we expect the most focused squalls to target the Goderich to London corridor off Lake Huron and the Collingwood to Bradford stretch off Georgian Bay.

Keep in mind, this is a rough idea from the models, and the exact placement can shift if the wind direction changes even slightly.

Hourly snowfall rates (cm) - MAP FROM WEATHERBELL

By the time the morning commute begins around 6 AM, snow squall activity will intensify as the Georgian Bay band becomes extremely narrow and focused. Some model runs have it stretching from Wasaga Beach through Angus and into the Innisfil to the Newmarket area.

There remains uncertainty in how much snow the City of Barrie itself will receive. The gradient between limited snow and a huge dumping will be very tight. The south and west ends are most likely to see major impacts, although it would not take much of a shift for the band to slide directly into the city.

The Lake Huron activity will begin to spread out with moderate snowfall covering much of Huron and Perth counties, including Goderich, Wingham, Stratford and Listowel. Because the band is more diffuse, there will not be one intense pocket as we expect with the Georgian Bay squall.

ESTIMATED WIND CHILL - MAP FROM WEATHERBELL

A major factor with this round of squalls that makes the situation more dangerous is the very cold wind chills. When you wake up Thursday, wind chills will make it feel like the -20s. Combined with squalls at the same time, the risk to anyone stranded on the roads increases significantly.

Aside from the cold creating hazards, it will also boost snowfall rates. Colder air produces drier, fluffier snow, which allows the same amount of moisture to create a larger volume of accumulation.

Hourly snowfall rates (cm) - MAP FROM WEATHERBELL

Little will change heading into the late morning as the Georgian Bay squall remains locked in place near the Barrie area. The band could edge far enough north to put the city core into the bullseye. Keswick may also be brought into the heavy snow as the band wobbles.

For the Lake Huron squall, the band may briefly become more focused as a single strong line cutting through Goderich and into Stratford and Woodstock. Depending on slight track shifts, Kitchener or Hamilton could also be affected at times.

Hourly snowfall rates (cm) - MAP FROM WEATHERBELL

Conditions are expected to deteriorate further into the afternoon. The Georgian Bay squall appears to strengthen with hourly snowfall rates easily exceeding 5cm and possibly pushing 10cm. At this point, the most intense pocket is shown just southwest of Barrie, with Angus being hit hardest.

The Lake Huron squall will also become more organized with an impressive fetch stretching all the way toward Lake Erie and impacting Woodstock and Norfolk.

Hourly snowfall rates (cm) - MAP FROM WEATHERBELL

There is significant concern for the Hwy 400 corridor during the afternoon and evening commute from just south of Barrie to roughly Aurora. This section of highway will likely become snow covered with road crews struggling to keep up with extreme snowfall rates. Combined with whiteout conditions, travel in this zone should be avoided unless absolutely necessary.

Hourly snowfall rates (cm) - MAP FROM WEATHERBELL

As we head into the evening and just past midnight, the squalls will retreat closer to the lakeshores as winds weaken and moisture supply cuts off. This will lead to activity tapering to lake effect flurries overnight into Friday morning.

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As always with snow squalls, snowfall forecasts should be taken with a large grain of salt. While models are in good agreement on placement and intensity, nothing is guaranteed as conditions need to align perfectly.

With that being said, we believe the hardest hit zone will be along the southeastern Georgian Bay shoreline from Wasaga Beach through Angus and into northern York Region. Barrie sits right on the edge but could easily end up inside the bullseye. Snowfall totals here are likely to exceed 40cm and may approach 75cm. Around Angus is where models show the strongest signal.

A tight gradient will set up with the north and east sides of Barrie, along with Keswick, Bradford and Collingwood, likely seeing 25 to 40cm of snow.

East of Lake Huron including Kincardine, Minto, Point Clark, Wingham, Listowel, Mitchell, Stratford, Exeter and Goderich, totals of 25 to 40cm are expected. Localized amounts up to 55cm are possible if a squall locks in place for several hours.

Totals of 15 to 25cm are possible for Midland and into central York Region including Newmarket and Aurora as well as Durham Region around Uxbridge. These areas will see occasional bursts of heavy snow near the edge of the main bands.

Southern Bruce and Grey counties along with Wellington County including Arthur and Oxford County may also see 15 to 25cm but totals depend on how far inland the bands extend.

Between 5 and 15cm is possible across the rest of York and Durham Region as well as northern Simcoe County including Orillia, Owen Sound, Shelburne, Fergus, Kitchener, Brantford and London. These locations sit farther from the core activity so most will see closer to 5cm with higher amounts only if a band stretches farther inland.

Less than 5cm is expected outside the snowbelt regions including Eastern Ontario, Deep Southwestern Ontario and the Golden Horseshoe.

‘Snow Day’ Forecast: Snow Squalls May Deliver a Second Snow Day to Some Students in Southern Ontario on Thursday

For an updated list of school bus cancellations & school closures, please visit our live article: https://instantweatherinc.com/article/2025/12/11/bus-cancellations

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

As snowfall from the Alberta clipper tapers off across Southern Ontario, attention quickly shifts to the next round of winter weather. Snow squalls are expected to develop off Lake Huron and Georgian Bay as early as Wednesday evening, continuing through the night and into Thursday morning.

These squalls have the potential to create dangerous travel conditions in portions of the traditional snowbelt, including Huron County, Grey-Bruce and Simcoe County. Intense snowfall rates combined with near-zero visibility may make it difficult for rural routes to be cleared in time for the morning commute. Because of this, some regions could be facing the possibility of a second straight snow day on Thursday.

The highest chance for another round of bus cancellations includes Huron County within the Avon Maitland District School Board, the Kincardine area within the Bluewater District School Board and the Simcoe West weather zone under the Simcoe County District School Board.

We have assigned these regions a 75 percent chance. While confidence is fairly strong that conditions will be poor enough to warrant cancellations, these boards have been more hesitant this season, even with strongly worded alerts from Environment Canada. That hesitation keeps this group just below the highest tier.

Surrounding regions sit in our 50 percent category, where conditions could genuinely go either way. This includes Middlesex and Oxford counties within the Thames Valley District School Board, Perth County under AMDSB and the Hanover, Southampton and Meaford areas within Bluewater. It also includes the Simcoe Central and Simcoe South weather zones. For these regions, much will depend on where the most persistent squalls set up Thursday morning. Given how lake effect snow can shift quickly, confidence stays right in the middle.

We have also assigned a 50 percent chance to parts of Eastern Ontario, including North Hastings, North Lennox and Addington and North and Central Frontenac within Tri-Board Student Transportation Services. The Madawaska zone within the Renfrew County District School Board also sits at 50 percent. Snow from the Alberta clipper may linger long enough to leave rural roads snow-covered into the morning, and these school boards tend to be more sensitive to deteriorating conditions.

A broader 25 percent zone covers the remaining rural portions of Eastern and Central Ontario. This includes the Upper Canada District School Board, the rest of the Renfrew County District School Board, the southern portions of Tri-Board, Peterborough County within the Kawartha Pine Ridge District School Board and regions covered by the Trillium Lakelands District School Board.

Snow should be wrapping up well before the bus run, but with temperatures dropping overnight and the potential for icy patches, we cannot completely rule out a few isolated cancellations. It remains questionable, but still possible.

We have also assigned a 25 percent chance to some snowbelt-adjacent communities that may be brushed by squalls at times but are expected to remain outside the core impact zone.

This includes Owen Sound and the Bruce Peninsula within the Bluewater District School Board, Dufferin County under the Upper Grand District School Board, the York Region District School Board and the Simcoe North weather zone. Occasional bursts of heavier snow are possible, but sustained conditions leading to cancellations are less likely.

Elsewhere across Southern Ontario, most school boards fall into the very low to low category. A few urban boards may keep a slight chance simply to account for any delays in overnight cleanup from Wednesday’s storm, but given that these same boards did not cancel on Wednesday, it is very unlikely they will decide to cancel on Thursday.

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Disclaimer: Instant Weather has zero authority when it comes to bus and school closures.

It is completely up to the school boards, bus companies, local authorities, and parents to decide what is best for their children. This is our best guess based on our forecast.

Southern Ontario: School Bus Cancellations and Closures for Wednesday, December 10, 2025

**Please refresh your page every few minutes to receive the latest update**

Cancellation & Closure Map (English Public and Catholic Schools)

Please note: School board boundaries are a rough estimate. Don’t use this map to determine what school board or weather zone you live in as accuracy isn’t guaranteed.

• Green = No Cancellations

• Red = Cancellations (Click for More Details)

• Purple = School Closures (Click for More Details)

List of Cancellations & Closures

English Public and Catholic Schools

• Avon MaitIand Public & Huron-Perth CathoIic: There are several closures/cancellations, please visit this link for more details: https://hpsts.mybusplanner.ca/Alerts

• BIuewater Public & Bruce-Grey Catholic: All busses are cancelled.

• Dufferin-PeeI Catholic: Buses to St. Andrew, St. Peter, St. Benedict AND in STOPR Zone 3 including ALL buses to Robert F. Hall CSS are cancelled today

• Durham Public & Durham Catholic: DSTS has cancelled all transportation for today due to inclement weather.

• Greater Essex Public & Windsor Essex CathoIic: All Board Provided Transportation is Cancelled for the day for County of Essex

• HaIton Public & Halton Catholic: transportation services in Zone 2 and Zone 3 are cancelled for the day.

• Kawartha Pine Ridge Public & Peterborough Victoria Northumberland Clarington Catholic: busing and school transportation is cancelled today.

• Lambton Kent Public & St. CIair Catholic: Busses cancelled in all zones today.

• Near North Public & Nipissing-Parry Sound CathoIic: School Bussing is cancelled in the Weather Zones of West Parry Sound and East Parry Sound South

• PeeI Public: All Transportation in Zone 3 (Caledon) is cancelled today.

• Renfrew County Public & Renfrew County Catholic: Transportation services are CANCELLED for ALL AREAS Wednesday December 10th, 2025 due to forecasted snowfall amounts throughout the day.

• Simcoe County Public & Simcoe Catholic: All busses are cancelled.

• Thames Valley Public & London CathoIic: Busses are cancelled for Middlesex, Oxford, and Elgin Counties, and Red Zone. Schools in the Middlesex, Oxford, and Elgin are CLOSED.

• Tri-Board: Due to significant snowfall expected across our region, all school bus and taxi transportation is cancelled in the Tri-Board Student Transportation Services area today.

• Trillium Lakelands: All school vehicles to schools in all Zones for Trillium Lakelands District School Board have been cancelled.

• Upper Canada Public & Eastern Ontario CathoIic: All transportation is cancelled due to forecasted severe weather and road conditions.

• Upper Grand Public & Wellington CathoIic: All busses are cancelled.

• WaterIoo Public & WaterIoo Catholic: All busses are cancelled.

• York Public & York Catholic: all school bus and taxi transportation serving the York Region District School Board and the York Catholic District School Board has been cancelled region-wide for today

French Schools

• Conseil des écoles publiques de l’Est de l’Ontario (CEPEO): All busses are cancelled EXCEPT for the City of Ottawa.

• Conseil catholique MonAvenir: Busses are cancelled for schools in Wellington, Simcoe, Peterborough, and Halton

• Conseil scolaire de district catholique de l'Est Ontarien (CSDCEO): All busses are cancelled

• Conseil des écoles catholiques de langue française du Centre-Est: All busses are cancelled EXCEPT for the City of Ottawa.

• Conseil scolaire catholique Providence: Busses are cancelled for Essex, York, SImcoe, Oxford, Middlesex, Lambton, Kitchener-Waterloo, Halton (Zones 2 & 3), Durham, Chatham-Kent, and Bruce-Grey

• Conseil scolaire Viamonde: Busses are cancelled for Essex, York, SImcoe, Oxford, Middlesex, Lambton, Kitchener-Waterloo, Halton (Zones 2 & 3), Durham, Chatham-Kent, and Bruce-Grey

• Le Conseil scolaire public du Nord-Est de l’Ontario (CSPNE) & Conseil scolaire catholique Franco-Nord: School Bussing is cancelled in the Weather Zones of West Parry Sound and East Parry Sound South

‘Snow Day’ Forecast: Many School Bus Cancellations Likely Across Southern Ontario on Wednesday as Clipper Threatens to Dump Up to 20cm of Snow

For an updated list of school bus cancellations & school closures, please visit our live article: https://instantweatherinc.com/article/2025/12/10/bus-cancellations

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

A strong Alberta clipper is expected to track across Southern Ontario overnight and into Wednesday. This system will bring a widespread area of heavy snowfall along with pockets of blowing snow that may significantly reduce visibility during the morning and afternoon hours.

Environment Canada has issued broad snowfall warnings ahead of the system, highlighting the potential for hazardous travel conditions throughout the day. With the most intense snowfall expected during the key morning commute window, many school boards, especially in rural regions, are likely to consider cancelling buses for Wednesday.

The highest confidence for a snow day lies across the Parry Sound and West Parry Sound regions within the Near North District School Board, along with Peterborough County under the Kawartha Pine Ridge District School Board and all regions covered by Tri-Board Student Transportation Services. These school boards have a well-established track record of cancelling when Environment Canada issues any form of winter weather warning. Because of this, we have assigned them a 90 percent chance of bus cancellations.

A large swath of Southwestern, Central and Eastern Ontario follows closely behind with a 75 percent chance of a snow day. This includes the Greater Essex County District School Board, all of the Lambton Kent District School Board, Middlesex County within the Thames Valley District School Board and both Huron and Perth counties under the Avon Maitland District School Board.

It also includes the full Bluewater District School Board, Wellington and Dufferin under the Upper Grand District School Board, Simcoe West and Simcoe North within the Simcoe County District School Board, all of the Trillium Lakelands District School Board, Northumberland County for KPR, and the full Renfrew County and Upper Canada District School Boards.

We expect most of these boards to cancel buses, although there remains a small possibility that a few may choose to operate. Snowfall amounts of 10 to 20 cm sit right on the line where some boards become hesitant, and this season, we have seen several take a stricter approach to cancellations. That uncertainty keeps this group slightly below the 90 percent tier.

For many of the province’s more urban school boards, the picture becomes less clear. These include Ottawa under the Ottawa Student Transportation Authority, Barrie and surrounding communities within Simcoe Central and Simcoe South, northern portions of the Durham District School Board, Guelph within the Upper Grand District School Board, northern Halton under Halton Student Transportation, Waterloo under Student Transportation Services of Waterloo Region, and parts of the Thames Valley District School Board covering Oxford County, Elgin County and the City of London.

Urban boards tend to require closer to 15-20 cm of snow on the ground before cancelling, and the clipper’s expected totals may fall just shy of that threshold in some neighbourhoods. Because of this, we expect roughly half of these boards to cancel and half to continue running.

For the Greater Toronto Area, confidence drops even further. Environment Canada has opted to issue a special weather statement rather than a snowfall warning, and the potential for mixing may limit totals during the morning commute. These boards, including Durham South, York Region, Toronto, Peel Region, southern Halton and Hamilton, along with Niagara, tend to be the strictest in the province when it comes to cancellations due to their lower reliance on bused students.

Here, the chance of a snow day ranges from around 10 percent in Toronto to up to 25 percent in the surrounding boards. Surprise cancellations are not impossible, but the overall lean is toward buses running.

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Disclaimer: Instant Weather has zero authority when it comes to bus and school closures.

It is completely up to the school boards, bus companies, local authorities, and parents to decide what is best for their children. This is our best guess based on our forecast.

Back-to-Back Clippers To Deliver Up to 20cm of Snow Across Southern Ontario by Wednesday

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

It has certainly been feeling a lot like winter over the last few weeks across Southern Ontario as the snow continues to pile up. Several clippers and rounds of lake effect snow have already delivered a healthy start to the season.

That trend shows no signs of slowing down as we enter the second week of December.

An Alberta clipper duo is set to slide through Southern Ontario back-to-back over the coming days. The second clipper arriving on Wednesday is expected to be the stronger of the two. Current indications suggest heavy snow combined with strong wind gusts may heavily impact the Wednesday morning commute.

By the time the second clipper wraps up late Wednesday, combined snowfall totals are expected to range from 10 to 20cm across a wide swath of Central, Eastern and Southwestern Ontario. Localized totals up to 25cm cannot be ruled out, especially if there is some lake enhancement.

Lower totals are expected along the Lake Ontario and Lake Erie shorelines where temperatures may climb just enough for some rain to mix in later Wednesday morning. Around 4 to 8cm is possible for Deep Southwestern Ontario and the Golden Horseshoe.

In the wake of the clippers, we are also monitoring a potential prolonged snow squall risk beginning Wednesday evening and potentially continuing through the rest of the week and into the weekend. Snowbelt regions around Lake Huron and Georgian Bay could be dealing with significant snowfall totals. There is still uncertainty regarding the exact placement of these bands.

PRECIP TYPE - MAP FROM WEATHERBELL

Things will begin to kick off late Tuesday morning into early Tuesday afternoon as precipitation from our first clipper enters from the west. Widespread light to moderate snow will spread across Southwestern Ontario, the Lake Huron shoreline and into portions of Central Ontario and the GTA.

This snow is not expected to be particularly intense, although locally heavier pockets are possible through the Bruce Peninsula and into Sudbury where lake enhancement may add extra moisture to an otherwise dry system.

Hourly snowfall rates (cm) - MAP FROM WEATHERBELL

Steady snow will continue throughout the afternoon on Tuesday and into the evening. The story with this first clipper will be the steadiness of the snowfall rather than the intensity. Major routes should remain drivable, but expect a slower evening commute with light snow ongoing at the time.

TOTAL SNOWFALL (CM) FROM CLIPPER #1 - MAP FROM WEATHERBELL

This clipper will begin to wind down later in the day on Tuesday with final amounts ranging from 2 to 8cm. The heaviest pockets will be east of Lake Huron and Georgian Bay. For the rest of Southern Ontario, accumulation will fall on the lower end of that range.

PRECIP TYPE - MAP FROM WEATHERBELL

However, do not let the lower totals by Tuesday evening lead you to let your guard down. Our next clipper is not far behind and will track toward Southern Ontario from the Midwest by late Tuesday evening.

Ahead of it, we may see a few hours of heavy snow squalls develop northeast of Georgian Bay and Lake Ontario. This could bring brief but heavy snow to areas like Parry Sound, Muskoka and Kingston.

PRECIP TYPE - MAP FROM WEATHERBELL

Conditions will really begin to deteriorate with the second clipper as the bulk of the precipitation spreads into Southwestern Ontario and the Golden Horseshoe right at the height of the Wednesday morning commute.

Some wet snow or even rain may mix in along the Lake Ontario and Erie shorelines which could suppress totals around the GTA and Niagara region.

Hourly snowfall rates (cm) - MAP FROM WEATHERBELL

The key difference with this clipper compared to the one 24 hours earlier is that the snowfall will arrive in a much shorter window instead of being spread throughout the day.

Hourly snowfall rates may reach 2 to 4cm through the London to Kitchener corridor. While the intense snow will not last long, just a few hours of that kind of snowfall can add up fast.

Winds are also expected to gust up to 60 km/h which combined with heavy snowfall could produce blowing snow and significantly reduced visibility. The morning commute is likely to be heavily impacted and school bus cancellations are quite possible on Wednesday.

Hourly snowfall rates (cm) - MAP FROM WEATHERBELL

The heaviest snowfall rates will not last long for Southwestern Ontario and the GTA as the 1+cm per hour rates shift into Central and Eastern Ontario by late morning.

Temperatures will also rise through the late morning and early afternoon which may allow some rain to mix in around the GTA and the Lake Erie shoreline.

PRECIP TYPE - MAP FROM WEATHERBELL

And yet, that is only the beginning because as the second clipper exits the region late Wednesday, the lake effect snow machine is expected to fire back up quickly by Wednesday evening.

Current data shows a focus on the London, Huron, Grey-Bruce, Collingwood and Barrie areas Wednesday night. The lake effect risk may carry into Thursday and possibly into the weekend as very cold air settles across Southern Ontario.

It remains unclear whether the wind direction will become stable enough to allow long-lasting snow squalls, but if it does, we could be looking at staggering snowfall totals by next week.

We will have a more precise breakdown of the snow squall risk closer to Thursday once high resolution model data is available to pinpoint where the bands may focus.

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

Turning back to the combined snowfall totals from the two clippers, we expect a wide zone stretching across much of Central and Eastern Ontario and into Southwestern Ontario east of Lake Huron to end up around 10 to 20cm. There is potential for over-performance as some recent models have trended upward showing widespread 20 to 25cm. As clippers can sometimes struggle with moisture, we have undercut that slightly to better reflect the consensus.

One area where that moisture struggle may occur is southeast of Georgian Bay, including Barrie and York Region. Models show slightly lower totals of 6 to 8cm here, so we have placed those regions in a 5 to 10cm range. This 5 to 10cm zone also extends along the Hwy 401 corridor into Deep Southwestern Ontario and into the Ottawa region.

For regions directly along the Lake Ontario and Erie shorelines like Toronto, Mississauga, Oakville, Burlington, Hamilton and St Catharines, snowfall may struggle to reach 5cm due to mixing potential and above freezing temperatures limiting accumulation.

Keep in mind that these are combined snowfall totals from both systems. Roughly 50-75 percent of the total will likely fall within a 6 hour period on Wednesday which is when conditions will be at their worst.

Additional snowfall is possible later Wednesday into Thursday with snow squall activity. Those amounts are not included in this map. A separate forecast will be issued on Wednesday for that.

Southern Ontario: ‘Snow Day’ Forecast for Tuesday, December 9, 2025

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

There are unlikely to be any school bus cancellations on Tuesday across Southern Ontario.

The only regions with any notable chance are the Bruce Peninsula under the Bluewater District School Board and areas within the Rainbow District School Board, where Environment Canada has issued a snow squall watch. However, the expected timing of the heaviest squall activity appears to fall later in the day on Tuesday, making it uncertain whether it will have much influence on the morning bus run. As a result, we have assigned a 10 to 25 percent chance for these regions.

Elsewhere, an Alberta Clipper will bring periods of light snow into Southwestern Ontario beginning Tuesday morning. Accumulation is expected to be minor and well below the threshold at which school boards typically consider cancelling buses. Even so, we have assigned a 5 to 10 percent chance to account for the outside possibility that Environment Canada issues an advisory before the morning decisions are made.

For the rest of Southern Ontario, no impacts are expected. So for now, it looks like you should plan to do your homework.

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Disclaimer: Instant Weather has zero authority when it comes to bus and school closures.

It is completely up to the school boards, bus companies, local authorities, and parents to decide what is best for their children. This is our best guess based on our forecast.

Southern Ontario: ‘Snow Day’ Forecast for Monday, December 8, 2025

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

With no major winter weather expected across Southern Ontario on Monday, we are not anticipating any widespread school bus cancellations.

There is, however, a low to slight chance (10 to 25 percent) for parts of Central Ontario, including regions under the Near North District School Board, as well as Muskoka and Haliburton within the Trillium Lakelands District School Board, and North Hastings under Tri-Board Student Transportation Services.

This is tied to the small possibility of cold-related cancellations. While current forecasts do not show temperatures dropping to levels that typically prompt a cancellation, if conditions trend colder overnight, a surprise decision cannot be ruled out.

We have also assigned a low to very low chance for areas near Lake Huron and Georgian Bay, where lake effect snow is still ongoing. Accumulation should taper off through the next few hours, and with totals expected to remain manageable, the likelihood of cancellations here is quite limited.

Everywhere else, we do not expect any disruptions to bus service on Monday. So tonight’s forecast is looking like you should plan to do your homework.

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Disclaimer: Instant Weather has zero authority when it comes to bus and school closures.

It is completely up to the school boards, bus companies, local authorities, and parents to decide what is best for their children. This is our best guess based on our forecast.

Southern Ontario: School Bus Cancellations and Closures for Friday, December 5, 2025

**Please refresh your page every few minutes to receive the latest update**

Cancellation & Closure Map (English Public and Catholic Schools)

Please note: School board boundaries are a rough estimate. Don’t use this map to determine what school board or weather zone you live in as accuracy isn’t guaranteed.

• Green = No Cancellations

• Red = Cancellations (Click for More Details)

• Purple = School Closures (Click for More Details)

List of Cancellations & Closures

English Public and Catholic Schools

• Near North Public & Nipissing-Parry Sound CathoIic: Bussing for all weather corridors are cancelled today.

French Schools

• Le Conseil scolaire public du Nord-Est de l’Ontario (CSPNE) & Conseil scolaire catholique Franco-Nord: Bussing for all weather corridors are cancelled today.

Southern Ontario: ‘Snow Day’ Forecast for Friday, December 5, 2025

For an updated list of school bus cancellations & school closures, please visit our live article: https://instantweatherinc.com/article/2025/12/5/bus-cancellations

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

Regions northeast of Georgian Bay are expected to see another round of snow squalls developing Friday morning and continuing throughout the day. These bands may intensify at times, creating reduced visibility and rapid snowfall accumulation.

Environment Canada has issued a snow squall watch for the area, noting the potential for 20 to 40 cm of snow. Given that setup, there is a reasonable chance that the Near North District School Board will choose to cancel buses in the hardest hit regions.

The highest likelihood is in the Parry Sound zone, which sits closest to where the squalls are expected to come ashore. We have assigned this area a 75 percent chance of cancellations. The remainder of Near North, including East Parry Sound and North Bay, is sitting at 50 percent as it is still unclear how far inland the strongest bands will extend.

We have also included a 25 percent chance for the Rainbow District School Board, focused mainly on Manitoulin Island, where the snow squall watch is also in effect. It is unlikely that the board would cancel across the entire district, so those in Greater Sudbury should expect buses to run as usual.

Elsewhere across Southern Ontario, no significant weather impacts are expected. This leaves the chances of a snow day in the low to very low range for most regions, so it may be a good idea to plan on doing your homework.

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Disclaimer: Instant Weather has zero authority when it comes to bus and school closures.

It is completely up to the school boards, bus companies, local authorities, and parents to decide what is best for their children. This is our best guess based on our forecast.

Southern Ontario: School Bus Cancellations and Closures for Thursday, December 4, 2025

**Please refresh your page every few minutes to receive the latest update**

Cancellation & Closure Map (English Public and Catholic Schools)

Please note: School board boundaries are a rough estimate. Don’t use this map to determine what school board or weather zone you live in as accuracy isn’t guaranteed.

• Green = No Cancellations

• Red = Cancellations (Click for More Details)

• Purple = School Closures (Click for More Details)

List of Cancellations & Closures

English Public and Catholic Schools

• Avon MaitIand Public & Huron-Perth CathoIic: There are several cancellations/closures, please visit this link for more details: https://hpsts.mybusplanner.ca/Alerts

• BIuewater Public & Bruce-Grey Catholic: All busses are cancelled.

• Lambton Kent Public & St. CIair Catholic: Buses in Zone 7 Cancelled Due to Road Conditions

• Simcoe County Public & Simcoe Catholic: Busses are cancelled for the North Zone.

French Schools

• Conseil scolaire catholique Providence: Busses are cancelled for Simcoe Zone North, Middlesex Region of Huron Perth, Chatham-Kent Zone 7, and Bruce-Grey Region.

• Conseil scolaire Viamonde: Busses are cancelled for Simcoe Zone North, Middlesex Region of Huron Perth, Chatham-Kent Zone 7, and Bruce-Grey Region.