Frost dates · California
California frost dates, county by county.
Last spring frost and first fall frost probability data for all 58 counties in California, computed from the NOAA 1991–2020 Climate Normals. Every county page surfaces the full probability table at three temperature thresholds plus crop-specific planting guidance.
Variation across California
131 days separate the earliest and latest counties.
The median last spring frost in Solano County is December 31 — 131 days earlier than Modoc County at May 11. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.
By geography
California counties on the map.
Each polygon is a county. Click for full frost-date detail. Color shows last-spring-frost timing — sage = earliest, amber = latest.
MapList
Last spring frostEarliestMedianLatest
58 counties · click any county for full frost data