Snow Day Calculator for Boulder, CO
Will Boulder schools be closed tomorrow?
Tomorrow by school district
| District | Closure | Link |
|---|---|---|
| Boulder Valley School District No. Re2 | — | — |
Districts serving Boulder ZIP codes (NCES). Chances from the National Weather Service forecast.
Not listed? Enter your ZIP
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Snow by hour
From the National Weather Service forecast, updated hourly. Estimate only. Your district makes the call.
Snow in Boulder: what is normal
- Snow a year
- 85 in.
- Days with 3+ in.
- 9.7
- Days with 1+ in.
- 20.8
NOAA NCEI U.S. Climate Normals 1991–2020, Boulder 2.9 S, CO station. Averages per year.
Boulder gets snow most winters, so districts plan for it. The calculator scales each storm by this local normal: in Boulder, closures usually take about 11 inches overnight, or ice, or snow at the worst time of the morning. How the calculator works.
What closes schools in Boulder (our model)
| Overnight snow | about 11 inches |
|---|---|
| Ice (freezing rain) | about 0.21 in. |
| Wind chill at bus time | −23°F |
| Normal winter low | 22°F |
Levels where a closure becomes likely in our model, from NOAA normals. Not a district policy.
ZIP codes covered
80310, 80304
ZIP codes inside or near Boulder. Each has its own forecast; enter yours above for your district.
Boulder snow day questions
Will Boulder, CO schools be closed tomorrow?
The calculator above shows tomorrow's chance of a closure and of a delay for each Boulder-area school district, from tonight's National Weather Service forecast. It updates every hour from the afternoon until morning. It is an estimate: your district makes and announces the decision, often early in the morning or the evening before a big storm.
How much snow does Boulder, CO get?
Boulder averages 85 inches of snow a year, with about 9.7 days a year of 3 inches or more and 20.8 days of an inch or more (NOAA 1991–2020 climate normals, Boulder 2.9 S, CO station).
How much snow does it take to close schools in Boulder, CO?
Our model treats about 11 inches of snow falling overnight as the level where closures become likely in Boulder, because the area sees 9.7 days a year with 3+ inches and is used to plowing. Ice, a winter storm warning, or heavy snow right at bus time can close schools with less.
Guides
- How much snow cancels school?
From one inch in Atlanta to a foot in Buffalo: what it takes in every state, with NOAA data.
- What time are snow days announced?
When districts decide, how they tell families, and when to check the calculator.
- Signs of a snow day tomorrow
The forecast signs that really matter, and the folklore that doesn't.
Nearby
Boulder: did school close today?
Your report improves tomorrow's estimate.