Colorado Snow Day Calculator: Chances & Closure Norms
What closes Colorado schools? Snowday's Colorado calculator typically flags a snow day at about 4–6 inches when snow coincides with the 5–9 a.m. commute — Front Range districts stay open in far more than they close. Denver averages about 57 inches a year. Enter your ZIP above for tomorrow's chance.
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Your forecast appears here. Enter a ZIP code or city above and press Calculate snow day chance.
Fun estimate only — always follow your school district’s official announcements.
How Colorado districts decide snow days
A typical Front Range closure happens when 4 to 6 inches falls between 4 a.m. and 8 a.m., before plows complete a pass, or when a storm intensifies through dismissal time. Districts like those in the Denver metro area lean heavily on delayed starts — a 2-hour delay buys the sun an hour or two of melting, which in Colorado often resolves the whole problem.
Cold closures are Colorado-specific: many districts cancel when morning wind chills reach roughly −20 °F, regardless of snow, because students waiting at bus stops face frostbite risk in minutes. Mountain districts in Summit and Park counties have higher snow tolerance and better equipment than metro districts.
Average snowfall in Colorado
| Place | Avg. snow per year |
|---|---|
| Denver | ≈ 57 in/yr |
| Colorado Springs | ≈ 40 in/yr |
| Wolf Creek (resort) | ≈ 400+ in/yr |
Averages are approximate NOAA/NCEI 1991–2020 climate normals, rounded; the Wolf Creek figure is a resort-reported seasonal average — among the highest in North America.
The storm Colorado remembers
The March 2003 blizzard. On March 18–19, 2003, the biggest blizzard in decades shut down the Front Range with about 32 inches in Denver and drifts over 4 feet, closing schools for days and collapsing greenhouse roofs. It remains the modern benchmark Colorado districts mention when a March storm spins up.
Using the calculator in Colorado
Snowday gives Colorado a 5-inch closure baseline but weights commute-hour snow and sub-15 °F cold heavily. Try the snow day calculator with your own ZIP code — 80203 for central Denver — and use the strictness slider for your district. For the full picture, open the snow day calculator and see how commute-hour snowfall, cold, and wind combine into tomorrow’s percent chance — free, instant, no sign-up.
Last updated: October 2026