Will school be cancelled tomorrow?

Use our Snow Day Predictor to check the probability of school cancellation. Enter your postal code or ZIP code to get an instant prediction based on real-time weather data and historical closure patterns for your area.

How accurate is the Snow Day Predictor?

Our predictions are approximately 95% accurate for short-term forecasts (within 24 hours). We use machine learning trained on historical HDSB closure data combined with real-time weather forecasts from Environment Canada and Open-Meteo.

When does HDSB announce school closures?

Halton Student Transportation Services (HSTS) begins monitoring weather conditions at 4:00 AM. School closure decisions are typically announced by 6:30 AM through the official HDSB website, Twitter/X (@HDSB), mobile app, and local news stations like CP24 and CTV.

How much snow does it take to cancel school in Ontario?

Based on our analysis of historical HDSB closures, schools have been cancelled with as little as 10cm of snow when combined with other factors. Generally, 15cm+ of snowfall during morning hours, combined with poor visibility, high winds, or extreme cold (-20°C), significantly increases closure probability.

Does this work for TDSB, PDSB, and other school boards?

Yes! While originally optimized for HDSB (Halton District School Board), our calculator works for any school in Canada or the United States. Simply enter your postal code or ZIP code. Supported boards include HCDSB, TDSB, PDSB, YRDSB, DDSB, DPCDSB, and more.

Is the Snow Day Predictor free to use?

Yes, the Snow Day Predictor is completely free with no registration required. Simply enter your postal code or ZIP code and get instant predictions. No ads, no account needed, no personal data collected.

What factors determine if school will be cancelled?

School closure decisions consider: total snowfall amount, snowfall intensity (how fast it falls), timing of precipitation (morning rush hour is critical), temperature and wind chill, visibility conditions, road safety for school buses, and municipal plowing capacity. Our algorithm weighs all these factors.

Snow Day Predictor | Halton Region HDSB School Closures

Enter Your Postal/ZIP Code

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Snow Day Chance

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Analyzing weather data...

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Total Snowfall

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Peak Intensity

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8 AM Temp

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8 AM Wind

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How It Works

We analyze real-time weather data including snowfall, temperature, wind speed, and visibility to predict the likelihood of a snow day.

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Data-Driven

Our predictions are based on historical school closure data from the HDSB and current weather forecasts from Environment Canada.

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Real-Time Updates

Weather conditions change rapidly. Check back frequently for the most up-to-date snow day predictions.

❓ Frequently Asked Questions

When does HDSB announce snow days?

Halton Student Transportation Services (HSTS) begins monitoring conditions at 4:00 AM. Decisions are typically announced by 6:30 AM through the official HDSB website, Twitter/X, and local news stations.

How much snow causes school closures?

Based on historical data, HDSB has closed schools with as little as 10cm of snow. Key factors include snowfall timing, intensity (how fast it falls), temperature, wind chill, and road conditions.

Does this work for other school boards?

While optimized for HDSB, our calculator works for HCDSB (Halton Catholic), PDSB (Peel), TDSB (Toronto), and other GTA school boards. Enter any Canadian postal code or US ZIP code.

How accurate are the predictions?

Our model is trained on real HDSB closure data and uses machine learning to analyze weather patterns. Accuracy improves as we get closer to the decision time (6:30 AM).

📝 Snow Day Tips & Updates

January 2026

Understanding HDSB's Snow Day Decision Process

Learn how Halton Student Transportation Services evaluates weather conditions and makes the call to close schools...

December 2025

Top 5 Activities for an Unexpected Snow Day

School's cancelled! Here are the best ways to make the most of your snow day in Halton Region...

November 2025

Historical Snow Day Trends: What the Data Shows

We analyzed 10 years of HDSB closures to find patterns in when and why schools close...