Snow Day Superstitions Kids Swear By (and the Real Science)
Pajamas inside out, ice cubes down the toilet and a spoon under the pillow. Here are the most famous snow day rituals plus what really makes it snow.
Live forecasts for the 2026-27 school year
Will You Get a Snow Day Tomorrow?
Type your ZIP or postal code. We check every hour of the forecast from 3 AM to 7 AM, look for black ice and adjust for how your area handles snow. One tap. No sliders.
Answers in about a second Hourly forecast, updated all night NOAA and Environment Canada weather models
Updated every hour
Trending Snow Day Cities
Live chances for big winter cities in the United States and Canada.
Live snow day map
Where Snow Days Could Happen Next
Every dot is a real forecast for the next school morning across the United States and Canada. Bigger colored dots mean a higher chance. The map refreshes every hour.
How it works
Three Steps. Zero Guesswork.
Other calculators make you move sliders and guess the weather. Ours reads the real forecast for you in about a second.
STEP 01
Geocode
Type a ZIP code, postal code or city. We find the exact spot on the map plus your state or province. ZIP and postal codes load almost instantly.
STEP 02
Pre-Dawn Analysis
We pull the hour by hour forecast and zoom in on 3 AM to 7 AM. That is when buses warm up and plows fall behind. We check for snow, freezing rain, wind and deep cold.
STEP 03
Regional Scaling
Last we adjust for where you live. Schools in Georgia close with less snow than schools in Minnesota. We also add a small bump for Mondays and Fridays.
Reading your result
What Your Percentage Really Means
The ring color tells you the story at a glance. Here is what each color means for your morning.
Very unlikely0 to 20%
Normal school day. Pack your backpack.
Unlikely21 to 40%
Small chance. A late start is more likely than a day off.
Possible41 to 60%
Coin flip. Have a backup plan for the morning.
Likely61 to 80%
Good odds. Watch for the call early in the morning.
Very likely81 to 99%
Big storm. Many schools will close or go remote.
Regional resilience
Why 2 Inches Closes Atlanta but Not Buffalo
Same snow, different answer. A town that gets snow all winter has more plows, more salt and more practice. Our calculator knows where you live and adjusts the chance for you. No sliders needed.
| Region | Typical snow to close | Biggest trigger | How tough |
|---|---|---|---|
| Deep South GA, AL, TX, FL, MS, LA, TN, the Carolinas | 1 to 2 in (3 to 5 cm) | Any ice, even a thin glaze | Closes easily |
| Mid-Atlantic and South Central VA, MD, DC, KY, MO, KS | 2 to 4 in (5 to 10 cm) | Ice on hills and bridges | Middle |
| Ohio Valley and Plains OH, IN, IL, IA, NE, CO | 4 to 6 in (10 to 15 cm) | Snow at bus time or blowing snow | Middle |
| Great Lakes and Northeast NY, MA, MI, WI, MN, VT, NH, ME | 6 to 12 in (15 to 30 cm) | Wind chill or lake-effect bands | Very tough |
| Ontario and Quebec Toronto, Ottawa, Montreal, Québec City | 15 cm or more | Freezing rain (buses cancelled first) | Very tough |
| The Prairies AB, SK, MB | Rarely closes for snow | Extreme cold and ground blizzards | Very tough |
| Atlantic Canada NS, NB, PE, NL | 10 to 20 cm | Messy mix of snow, ice pellets and rain | Middle |
| Pacific Coast WA, OR, coastal BC | 1 to 3 in (3 to 8 cm) | Hills plus few winter tires | Middle |
These are common patterns, not official rules. Every district sets its own limits.
Same 3 cm pre-dawn storm, four different cities
We ran one pretend storm through our real scoring engine. Only the location changed.
Atlanta, GA
Likely
Denver, CO
Possible
Vancouver, BC
Possible
Buffalo, NY
Possible
The complete guide
Snow Day Calculator: How School Closures Really Work
A snow day calculator answers one big question: will school be closed tomorrow? A normal weather app tells you how much snow will fall. It does not tell you what your school will do about it. Our tool connects the two. It reads the forecast the same way a school leader does and turns it into one simple number.
Why the hours between 3 AM and 7 AM matter most
Most school buses leave the lot between 6 AM and 7 AM. Drivers start checking roads even earlier. If snow stops at midnight, plows have all night to clean up. If snow is falling hard at 5 AM, roads are at their worst right when kids need to travel. That is why we look at every single hour in that window instead of just the daily total.
What happens the night before a snow day
Here is a normal timeline for a school district when a storm is coming:
- Afternoon: Leaders watch the forecast. Some districts announce an early closing for very big storms.
- Evening: Road crews spread salt or brine on main roads before the snow starts.
- 3 AM to 4:30 AM: Transportation staff drive bus routes to see the real road conditions.
- 4:30 AM to 5:30 AM: The superintendent talks with road crews and nearby districts. Then they make the call.
- 5:30 AM to 6:30 AM: Families get a text, email or phone call. Local TV and radio post the list.
Lake-effect snow: the surprise storm
If you live near the Great Lakes, you know this one. Cold air blows across warmer lake water. The air picks up moisture and dumps it as snow on land downwind. These snow bands can be very narrow. One side of town can get a foot of snow while the other side gets a dusting. Buffalo, Syracuse, Cleveland, Erie and parts of Ontario see this a lot. Our forecast uses high resolution weather models that can pick up many of these bands. For the most exact number, search your own ZIP or postal code instead of the nearest big city.
Weather alerts in plain words
In the United States, the National Weather Service uses three main levels for winter storms:
- Winter Weather Advisory: Snow or ice will make travel annoying and a bit risky. Delays are common.
- Winter Storm Watch: A big storm might hit in the next day or two. Stay tuned.
- Winter Storm Warning or Blizzard Warning: A dangerous storm is coming or already here. Closures are very likely.
When one of these is active for a US location, we show it right in your result. In Canada, Environment Canada posts its own warnings for snowfall, freezing rain, blizzards and extreme cold on its weather website.
Snow day or remote day?
Many districts can now switch to online classes instead of closing. If your school does this, a high chance on our calculator may mean a laptop day at home. In Ontario and other parts of Canada, boards often cancel school buses but keep buildings open for kids who can walk. Check your district's winter weather policy so you know which one to expect.
Good to know: our percentage predicts what school leaders are likely to do. The official decision always comes from your district or board. Sign up for their text alerts before winter starts.
Be ready
Your Snow Day Game Plan
A high chance tonight? Here is how to be ready whether school closes or not.
For parents
- Sign up for your district's text or email alerts today.
- Line up a backup sitter or a work from home plan the night before.
- Charge phones and laptops in case school goes remote.
- Set out warm layers, boots, hats and gloves by the door.
- Plan a few extra minutes for the drive if school stays open.
For kids
- Finish your homework anyway. A snow day is never a sure thing.
- Pack your bag so you are ready either way.
- Dress in layers when you go out to play in the snow.
- Come inside if your fingers or toes start to go numb.
- Stay away from roads where plows are working.
FAQ
Snow Day Questions, Answered
Short answers to the things parents, students and teachers ask us most.
How accurate is the Snow Day Calculator?
Our number is only as good as the weather forecast behind it. We use the same weather models that NOAA and Environment Canada run, served through Open-Meteo. Forecasts for the next 12 to 24 hours are usually very good.
Still, no one can read a superintendent's mind. Bus driver shortages, a broken boiler or a last minute storm shift can change the call. Treat our percentage as a smart guess, not a promise.
When is the best time to check?
Check between 8 PM and 10 PM the night before. That is when the forecast for the next morning is the most reliable. Check once more around 5 AM if the storm is close. Most districts announce their decision between 5 AM and 6:30 AM.
Why does my friend in another state get a different number for the same storm?
Because where you live changes how schools react. We multiply the score by 1.35 in places like Georgia and Texas where snow is rare. We multiply by 0.75 in places like New York, Minnesota, Ontario and Quebec where schools are built for winter. Everywhere else in the US stays at 1.0. The rest of Canada uses 0.85.
Does it work with Canadian postal codes?
Yes. Type your full postal code (like M5V 3L9) or just the first three characters. You can also type a city with its province, like "Halifax, NS" or "Calgary Alberta".
What does the Pre-Dawn Peak badge mean?
It means at least 2 cm (about 0.8 inches) of snow is forecast to fall between 3 AM and 7 AM. This is the worst time for snow. Bus drivers are starting their routes and plows have not caught up yet. It adds 25 points to the score.
What does the Black Ice Alert mean?
The hourly forecast shows freezing rain or freezing drizzle before sunrise. That can coat roads in thin ice that is hard to see. It adds 30 points because ice is the number one cause of school closures.
What does Blizzard Synergy mean?
It shows up when pre-dawn snow and strong wind (35 km/h or about 22 mph and up) happen at the same time. Wind blows fresh snow into drifts and makes it hard to see. Together they are much worse than either one alone so we add 25 extra points.
Can very cold weather close schools with no snow?
Yes. In the northern states and much of Canada, districts cancel buses or school when the wind chill gets dangerous. We add 20 points when the low drops below -15°C (5°F) because frostbite becomes a real risk for kids at bus stops.
What is the difference between a snow day and a two hour delay?
A snow day means no school at all. A two hour delay means school starts later so roads have time to improve. If your chance is between about 20% and 50%, a delay is quite possible even if a full closure is not.
Why is the top score 99% and not 100%?
Because nothing is certain until your district makes the call. Even in a huge storm some schools switch to remote learning or stay open. 99% means "about as sure as a forecast can get."
Why are there no sliders to adjust the weather?
Other calculators ask you to guess the snow total and the temperature. That only works if you already know the forecast. We read the real hour by hour forecast for you so you get an honest answer in one tap.
Does the calculator work on weekends?
It still shows how strong the storm is. It also tells you clearly that there is no school that day. On a Sunday night it looks ahead to Monday morning.
Is it free? Do you save my location?
It is 100% free with no sign up. We use your ZIP, postal code or city only to look up the forecast. We do not save it to an account or sell it.
From the blog
Winter Guides for Families
Simple reads about snow, ice and how schools decide.
Black Ice: Why a Little Freezing Rain Closes So Many Schools
Freezing rain is the sneakiest winter weather. Learn what black ice is, why plows cannot fix it and why school leaders fear it more than snow.
Snow Day, Delay or Bus Cancellation: What Is the Difference?
A two hour delay, a closed school, a remote learning day and a bus cancellation are not the same thing. Here is what each one means for your family.
City forecasts
Snow Day Predictions by City
Pick a city for its live chance, local school notes and hour by hour storm timing.
United States (31 cities)
- Buffalo, NY
- Rochester, NY
- Syracuse, NY
- New York City, NY
- Boston, MA
- Burlington, VT
- Philadelphia, PA
- Pittsburgh, PA
- Baltimore, MD
- Washington, DC
- Cleveland, OH
- Columbus, OH
- Detroit, MI
- Chicago, IL
- Milwaukee, WI
- Minneapolis, MN
- Fargo, ND
- Des Moines, IA
- Omaha, NE
- Indianapolis, IN
- St. Louis, MO
- Kansas City, MO
- Denver, CO
- Salt Lake City, UT
- Anchorage, AK
- Seattle, WA
- Portland, OR
- Nashville, TN
- Atlanta, GA
- Charlotte, NC
- Dallas, TX