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School Closing Predictions
Will school be cancelled tomorrow?
Pick a day and a location. This scores the forecast against the criteria districts actually use to decide — snowfall, storm timing, temperature, wind and how much your area normally tolerates — and returns a closure probability for that district, not a national average.
Your Closure Chance
Buses are a separate decision — check the bus cancellation predictor for that.
Closure, Delay and Cancellation Are Not the Same Thing
"School is cancelled" gets used for five genuinely different outcomes, and knowing which one you are facing changes what you need to arrange. A high probability above does not tell you which of these your district will pick — only that conditions are bad enough for one of them.
| Outcome | What happens | When districts choose it |
|---|---|---|
| Full closure | The building does not open. The day is usually made up later in the year. | Roads are genuinely unsafe, or conditions will worsen through the morning. |
| Two-hour delay | Everything starts late. Buses run on a shifted schedule. | Conditions are borderline and two hours of daylight and traffic will fix them. Costs nothing on the calendar, so it is the default on marginal mornings. |
| Early dismissal | Students are sent home mid-day. | A storm arrives faster than forecast after school has already opened. Used reluctantly — sending children to empty houses creates its own problems. |
| Remote / e-learning day | Instruction continues from home. No buses, no building. | Increasingly common. Protects the calendar without putting buses on ice, so districts reach for it before spending a snow day. |
| Bus cancellation only | School opens; transportation does not. | Rural routes are unsafe but the building and main roads are fine. Standard across most of Ontario. |
The last one catches people out most often. If your real question is whether a bus is coming rather than whether the school is open, the bus cancellation predictor answers that separately — it weights blowing snow and open rural roads far more heavily, because that is what actually pulls buses.
How Districts Actually Make the Call
Predicting a closure is easier once you know it is not a weather decision. It is an operations decision that happens on a fixed timetable.
- Evening before. Transportation and facilities staff watch the forecast. If a major storm is already locked in, some districts announce here — but only when it is close to certain, because reversing an early call is far worse than making a late one.
- 3:00 to 4:30am. Road crews and transportation supervisors physically drive the worst routes. This is the part no forecast can replace, and it is why the decision cannot come earlier.
- 4:30 to 5:30am. Supervisors report back. The superintendent weighs road conditions against staffing, whether neighbouring districts have called it, how many snow days remain, and whether the storm is ending or building.
- 5:00 to 6:00am. The decision goes out — automated calls and texts first, then the website, social media and local media.
- After 6:30am. Silence means school is running. Districts almost never announce a closure this late unless something has gone genuinely wrong.
This timetable is why storm timing beats snowfall total in every prediction that is worth reading. A storm that finishes at midnight gives crews a clean overnight run and the 4am patrol finds passable roads. The identical total still falling at 5am finds crews losing ground exactly as the decision is being made.
Why the District Next Door Decided Differently
Two boards ten miles apart routinely make opposite calls on the same storm, and it is not arbitrary. The variables that differ between them are usually invisible from outside:
- Road network. Sixty miles of unpaved concession road is a different problem from a grid of plowed city streets, even under identical snowfall.
- Plow capacity. Fleet size per road mile varies enormously between neighbouring boards, and it is the single biggest driver of how much snow a district can absorb.
- How students travel. A district where most children walk faces a sidewalk-and-ice problem. A district that buses everyone faces a rural-road problem. Ice closes the first; drifting closes the second.
- Snow days remaining. A board that has already spent its allowance pushes much harder to stay open, because every further closure extends the school year.
- Remote-learning capability. Districts set up for e-learning convert closures into remote days, so their raw "closure" count looks lower than a neighbour's.
- Hills. Genuinely decisive and almost never discussed. A loaded bus that cannot climb an iced grade closes a route on a day the flat district beside it runs normally.
The calculator lets you set district type, regional tolerance and snow days used precisely because these are the variables that separate two towns getting the same forecast.
How Far Ahead Can Closings Be Predicted?
| Lead time | How much to trust it |
|---|---|
| Same morning | The decision usually already exists. Check your district first — a prediction cannot override an announcement. |
| Tomorrow | The most reliable window. Snowfall forecasts inside 24 hours are typically accurate to about an inch, so the probability is genuinely meaningful. |
| 2–3 days | Useful for planning. Totals can still shift by a couple of inches, which is enough to move a borderline call either way. |
| 4–7 days | A rough signal only. A small change in storm track turns six inches into rain, and any specific number at this range is overconfident. |
The part that never becomes predictable is the human one. Two superintendents can read identical road reports and decide differently, and no model can account for a burst pipe, a power failure, or a board that simply has a lower tolerance than its neighbours. Treat any prediction as a well-informed estimate of risk, never as an announcement.
School Closing Questions
Will school be cancelled tomorrow?
Enter your city or zip code above and select the day. The calculator reads the hourly forecast for your coordinates and scores it against the criteria districts actually use: snowfall total, how much of it lands during the morning commute, temperature, wind, and how much snow your area normally tolerates. It returns a closure probability rather than a raw forecast.
How are school closings predicted?
A prediction combines the forecast with the district's own behaviour. The forecast supplies snowfall, timing, temperature and wind; the district supplies a threshold, which varies enormously by region, road network and how many snow days it has already spent. A prediction that ignores the second half is just a weather report.
What is the difference between a closure, a delay and a cancellation?
A closure means the building does not open at all. A delay, usually two hours, opens late so crews get extra daylight to clear roads. An early dismissal sends students home mid-day when a storm arrives faster than forecast. A remote or e-learning day keeps instruction running from home without buses. A bus cancellation pulls transportation while the school itself stays open.
Why do neighbouring districts make different decisions?
Because they face different problems. A rural district running sixty miles of unpaved back roads has a completely different risk profile from an urban district where most children walk. Plow budgets, hill grades, the number of snow days already used, and whether the district has a remote-learning option all push neighbouring boards to opposite calls in the same storm.
How accurate are school closing predictions?
Inside 24 to 48 hours they are reasonably reliable, because the underlying snowfall forecast is reliable that close in. Beyond three days the forecast itself can swing by several inches and the prediction becomes a rough signal at best. The irreducible uncertainty is human: a superintendent weighing staffing, timing and the calendar can decide either way on identical conditions.
What time are school closings announced?
Most districts announce between 4:30am and 6:00am, after road crews have driven the routes at first light. A minority call it the evening before when a major storm is already certain. If nothing has been posted by 6:30am, school is almost always running.
Do snow days still happen now that remote learning exists?
Less often than they used to. Many districts now convert what would have been a closure into a remote-learning day, which protects the calendar without putting buses on ice. True closures still happen when power is out or the storm is severe enough that families cannot get online either.
How many centimetres of snow does it take to cancel school?
There is no fixed figure. Across most of Canada roughly 15 to 25 cm overnight puts a closure in play, while in the UK and Ireland 3 to 8 cm can be enough. Timing matters as much as depth: 8 cm falling between 3am and 7am closes more districts than 20 cm that finishes before midnight.
Where should I check for the actual announcement?
Your district's own website is authoritative and updates first, followed by their automated phone, text and social media alerts. Local radio and TV read from the same feed a few minutes later. A friend in the next town is not a reliable source — neighbouring districts routinely disagree.
One Important Caveat
This is a prediction for planning, not an official notice. Only your school district can close a school. Always check their website, phone system or social media before assuming anything — and never make a travel decision based on this page instead of an official weather warning.