Frost dates · 2 cities · zones 5a–5b
Wyoming frost dates, city by city
Median last spring frost across 2 Wyoming cities runs from May 10 in Casper to May 14 in Cheyenne.
| City | Zone | Last frost median | First frost median | Season | Jan → Dec |
|---|---|---|---|---|---|
| Cheyenne | 5b | May 14 | Oct 1 | 139 d | |
| Casper | 5a | May 10 | Sep 29 | 138 d |
Medians from NOAA NCEI 1991–2020 U.S. Climate Normals at each city's nearest qualifying station; zones from the 2023 USDA Plant Hardiness Zone Map. Open a city for the 1-in-10-year dates, the station, and a planting calendar for every sauce crop.
All states →Build a plan from your ZIP →Earliest: Casper (May 10) · Latest: Cheyenne (May 14)