Wyoming Snow Day Calculator: Chances & Closure Norms
What closes Wyoming schools? Wind, more than snow — Snowday's Wyoming calculator still needs about 4–6 inches for a base score, but 20+ mph wind hours push it fast because blowing snow closes I-80 and bus routes outright. Cheyenne averages about 60 inches a year. Enter your ZIP above.
Snow day calculator
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Result
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 Wyoming districts decide snow days
The typical closure pattern: 4 to 6 inches of snow combined with sustained winds above about 25 mph, or any storm that shuts the interstates. Rural districts covering 1,000+ square miles close when WYDOT pulls buses off I-25, I-80, or I-90, which happens repeatedly every winter.
Districts like those in Laramie County build roughly five closure days into the calendar and use them freely — the culture treats closure as routine safety management, not an event. Cold closures join the mix in the Basin: wind chills near −25 °F close districts from Casper to Gillette.
Average snowfall in Wyoming
| Place | Avg. snow per year |
|---|---|
| Cheyenne | ≈ 60 in/yr |
| Casper | ≈ 75 in/yr |
| Laramie | ≈ 65 in/yr |
Averages are approximate NOAA/NCEI 1991–2020 climate normals, rounded. Cheyenne’s elevation (just over 6,000 feet) means its snow often arrives as fast-moving fall and spring cyclones rather than long lake-effect events.
The storm Wyoming remembers
The March 2021 Cheyenne blizzard. On March 13–14, 2021, a slow-moving storm buried Cheyenne under roughly two feet of snow — one of the city’s biggest single-storm totals on record — closing Interstate 80 and schools across southeast Wyoming for days. It was the rare Wyoming storm where depth, not wind, did the closing.
Using the calculator in Wyoming
Snowday’s wind bonus (hours at or above 20 mph) is the factor to watch in Wyoming, layered on a 5-inch baseline. Try the snow day calculator with ZIP 82001 and see how wind hours move tomorrow’s score. 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