Frost dates for Rudyard 19S, MT
At this NOAA station the last spring frost (32°F) usually comes by May 23 and the first fall frost around September 19, giving a growing season of about 119 days.
May 23average last spring frost
September 19average first fall frost
JanAprJulOctDec
Frost odds
| 1 year in 10 the last spring frost is later than | June 3 |
| Half of years the last spring frost is later than | May 23 |
| 9 years in 10 the last spring frost is later than | May 12 |
| 1 year in 10 the first fall frost is earlier than | September 5 |
| Half of years the first fall frost is earlier than | September 19 |
| 9 years in 10 the first fall frost is earlier than | October 1 |
A hard freeze (28°F) usually ends by May 12 and returns around September 27.
A light frost (36°F, which can still nip tender plants) usually ends by June 5 and returns around September 8.
Station USC00247247, elevation 877 m. Based on 19 years of 1991 to 2020 records. A garden higher up, in a hollow or far from this station can freeze later in spring.
Check another ZIP
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