Frost dates for Rancho Bernardo, CA
At this NOAA station the last spring frost (32°F) usually comes by January 5 and the first fall frost around January 2, giving a growing season of about 365 days.
January 5average last spring frost
January 2average first fall frost
Frost odds
| 1 year in 10 the last spring frost is later than | February 1 |
| Half of years the last spring frost is later than | January 5 |
| 9 years in 10 the last spring frost is later than | December 13 |
| 1 year in 10 the first fall frost is earlier than | December 13 |
| Half of years the first fall frost is earlier than | January 2 |
| 9 years in 10 the first fall frost is earlier than | January 31 |
A light frost (36°F, which can still nip tender plants) usually ends by January 23 and returns around December 23.
Station USC00047248, elevation 210 m. Based on 7 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