Frost dates for Healdsburg, CA
At this NOAA station the last spring frost (32°F) usually comes by February 15 and the first fall frost around December 2, giving a growing season of about 292 days.
February 15average last spring frost
December 2average first fall frost
JanAprJulOctDec
Frost odds
| 1 year in 10 the last spring frost is later than | March 17 |
| Half of years the last spring frost is later than | February 15 |
| 9 years in 10 the last spring frost is later than | January 4 |
| 1 year in 10 the first fall frost is earlier than | November 14 |
| Half of years the first fall frost is earlier than | December 2 |
| 9 years in 10 the first fall frost is earlier than | January 1 |
A hard freeze (28°F) usually ends by January 7 and returns around December 17.
A light frost (36°F, which can still nip tender plants) usually ends by March 29 and returns around November 16.
Station USC00043875, elevation 54 m. Based on 22 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