Frost dates for Moorcroft 3S, WY
At this NOAA station the last spring frost (32°F) usually comes by May 22 and the first fall frost around September 28, giving a growing season of about 127 days.
May 22average last spring frost
September 28average first fall frost
JanAprJulOctDec
Frost odds
| 1 year in 10 the last spring frost is later than | June 9 |
| Half of years the last spring frost is later than | May 22 |
| 9 years in 10 the last spring frost is later than | May 8 |
| 1 year in 10 the first fall frost is earlier than | September 11 |
| Half of years the first fall frost is earlier than | September 28 |
| 9 years in 10 the first fall frost is earlier than | October 10 |
A hard freeze (28°F) usually ends by May 10 and returns around October 5.
A light frost (36°F, which can still nip tender plants) usually ends by June 1 and returns around September 16.
Station USW00024088, elevation 1318 m. Based on 13 years of 1991 to 2020 records. A garden higher up, in a hollow or far from this station can freeze later in spring.
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Sources
- U.S. Annual/Seasonal Climate Normals, 1991 to 2020 (freeze probability dates by station), NOAA National Centers for Environmental Information, checked 1 November 2026
- Annual/Seasonal Normals 1991 to 2020 documentation, NOAA National Centers for Environmental Information, checked 1 November 2026
- 2024 Gazetteer Files, ZIP Code Tabulation Areas, US Census Bureau, checked 1 November 2026