Snow Day Predictor Canada — Will School Be Closed Tomorrow?
SnowDayCA is a free snow day predictor and snow day calculator for Canada. Enter your city or postal code to get the live probability of a snow day or bus cancellation tomorrow — scored from current weather with a transparent four-factor formula.
What Is a Snow Day Predictor?
A snow day predictor is a free online tool that estimates the chance your school will close because of snow, ice, or extreme cold. SnowDayCA reads live Canadian weather — temperature, snowfall, wind, and snow probability — and turns it into one clear percentage before any official announcement.
Every winter, parents, students, teachers, and bus drivers ask the same question the night before a storm: will there be school tomorrow? Instead of waiting for the 6 a.m. call, you can check your odds early. SnowDayCA is made only for Canada, so it works with metric units and Canadian cities and postal codes, from Ontario to Alberta and British Columbia.
Snow Day Calculator: How the Probability Score Works
Think of SnowDayCA as a snow day calculator: it takes live weather for your exact location and turns it into a single probability score from 0 to 100 percent. No black box — the four factors below are the whole formula.
1. Live Weather Data
We read current temperature, expected snowfall, wind speed, and snow probability for your city or postal code, refreshing as the storm develops.
2. Four Scored Factors
Expected snowfall carries the most weight, then extreme cold, then strong winds, then the chance of snow. Every location uses the same fixed thresholds.
3. One Clear Percentage
You get one score from 0 to 100. A higher score means worse winter travel conditions. It is a planning estimate — final decisions always rest with your school board.
How accurate is the snow day calculator? Accuracy is highest 12 to 24 hours before a storm, when overnight weather is easier to forecast. Longer-range checks help you plan but carry more uncertainty — and no score can see road conditions, bus-driver reports, or staffing, so always confirm with your board.
Want the full method? See how the popular AccuWeather snow day calculator works and how accurate it is.
Will There Be a Snow Day Tomorrow?
What is the chance of a snow day tomorrow? Enter your city or postal code in the live forecast above and you will get a probability score for tomorrow based on current weather. For the clearest read, check the evening before and again early in the morning once overnight snow has actually fallen.
What are the chances of a snow day tomorrow in Ontario? Ontario boards weigh timing and ice as well as totals. A few centimetres of freezing rain can shut down buses faster than a much larger snowfall, because ice coats roads and sidewalks and takes longer to clear than snow.
Will there be school tomorrow? If your score is high, plan as if travel will be difficult: charge devices, line up childcare, and check whether your board uses remote learning days instead of full closures. Then confirm with your school board's official announcement in the morning.
Can I check the odds for a specific day, like Monday? Yes. The tool reflects current conditions and the next 24 to 48 hours — the most reliable window. For a day further out, use it for early planning and recheck the night before, since forecasts sharpen as the storm gets closer.
Bus Cancellation Predictor: Closures vs Cancellations
What is a bus cancellation predictor? It answers a narrower question than a snow day predictor: will the buses run tomorrow, even if school stays open? A snow day means the school itself is closed and no one attends. A bus cancellation means buses do not run, but the school stays open for students who can get there another way. Bus cancellations are far more common than full closures — most moderate storms cancel buses without closing schools.
Will buses be cancelled tomorrow? Check the live forecast above and look at the breakdown: high wind or extreme cold with little snow often means buses are the question, not a full closure. Our school bus safety in snowstorms guide explains what boards look at before pulling buses off the road.
How do schools decide between a snow day and a bus cancellation? Boards decide around 5–6 a.m. based on road conditions, police reports, and whether buses can run safely on rural routes. Our guide on how Canadian schools decide snow days walks through the full decision process.
Snow Day Predictor by City and Province
Winter is very different across Canada, so we build local pages with regional school-board context and storm patterns:
Prefer alerts on your phone? Our roundup of the best snow day predictor apps for Canada covers iOS, Android, and web. A snow day map view is coming soon.
Winter Safety and Snow Day Resources
A snow day is about more than a day off. These guides help families stay safe, warm, and productive when winter weather hits:
Why You Can Trust SnowDayCA
Canada-first and transparent. Built only for Canadian winters — metric units and Canadian cities and postal codes — with a published scoring formula instead of a black box.
Live, sourced weather. Your score reflects the storm as it develops, from live Open-Meteo weather data — not a stale estimate.
Honest about limits. We are a planning aid, not an official source. Final closure and bus decisions always rest with your local school board. Read our disclaimer and about page, or contact us with questions.
Snow Day Predictor: Frequently Asked Questions
Are snow day predictors accurate?
Most accurate 12 to 24 hours before a storm, where a good tool closely matches real closures. Accuracy drops several days out. Treat the score as a strong planning estimate and confirm with your school board.
What is a snow day calculator?
A snow day calculator is another name for a snow day predictor: you enter your location, it scores live weather — snowfall, temperature, wind, and snow probability — and returns the chance of a snow day as a percentage. SnowDayCA works as both.
How accurate is the snow day calculator?
Highest in the 12–24 hours before a storm. It is a planning estimate based on live weather — it cannot see road conditions or staffing, so confirm with your board.
Is it going to be a snow day tomorrow?
Enter your city or postal code in the live forecast at the top of the page for a probability score for tomorrow. Check the evening before and again early morning for the clearest read.
What is the difference between a snow day and a bus cancellation?
A snow day closes the school for everyone; a bus cancellation stops buses while school stays open. Cancellations happen far more often than full closures.
Will buses be cancelled tomorrow in Ontario?
When the forecast points to morning ice, high winds, or poor rural road conditions rather than heavy snow, Ontario boards often cancel buses while keeping schools open. Check the live score above — and your board's announcement by 6 a.m.
How do schools decide snow days in Canada?
Boards decide around 5–6 a.m. using road conditions, police and bus-driver reports, and weather timing — not snowfall totals alone.
How much snow does it take for a snow day?
There is no fixed amount. Some boards close at 5–10 cm if it falls during the morning commute; others stay open through 20 cm if roads are cleared. Timing, ice, and wind matter more than totals.
Can school close because of freezing rain?
Yes — freezing rain often causes closures with far less accumulation than snow, because ice coats roads and sidewalks and is slow to clear.
How much snow is too much to drive in?
Driving gets risky once snow reduces traction and visibility, generally from about 5–10 cm of fresh snow — though ice and wind matter as much as depth.
Why is snow dangerous?
Snow itself is rarely dangerous; the conditions are — slippery roads, low visibility, and cold exposure. Ice under fresh snow and driving too fast for conditions cause most winter collisions.
Is shoveling snow dangerous?
It can be: shoveling spikes heart rate and blood pressure in cold air, with a small but real heart-strain risk, plus back injuries from poor form. Pace yourself and push rather than lift where possible.
How long will it snow today?
Depends on the storm system — from a few hours to over a day. Check Environment Canada's forecast for your region and recheck here as conditions develop.
What is a remote learning day?
School stays officially open but students learn from home instead of commuting in poor weather — used by some boards instead of a full snow day. Not all boards use them.
Is the snow day predictor free?
Yes — completely free, no sign-up, no account. Enter a city or postal code and get your forecast.
Why is my score low in summer?
The tool reads live weather, so outside winter there is little snow risk and scores sit near zero. Probabilities become meaningful roughly December through March.