Frost dates for Alturas Muni Airport, CA
At this NOAA station the last spring frost (32°F) usually comes by June 3 and the first fall frost around September 12, giving a growing season of about 97 days.
June 3average last spring frost
September 12average first fall frost
JanAprJulOctDec
Frost odds
| 1 year in 10 the last spring frost is later than | June 24 |
| Half of years the last spring frost is later than | June 3 |
| 9 years in 10 the last spring frost is later than | May 14 |
| 1 year in 10 the first fall frost is earlier than | August 27 |
| Half of years the first fall frost is earlier than | September 12 |
| 9 years in 10 the first fall frost is earlier than | September 27 |
A hard freeze (28°F) usually ends by May 11 and returns around September 25.
Station USW00094299, elevation 1334 m. Based on 21 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