Bield:Farm
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

999 days separate the earliest and latest counties.

The median last spring frost in Solano County is December 31 — 999 days earlier than Los Angeles County at —. 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 dot is a county. Click for full frost-date detail. Color shows last-spring-frost timing — sage = earliest, amber = latest.

ListMap
San Benito County · Spring Mar 12 · Fall Nov 22 · 255-day seasonShasta County · Spring Jan 18 · Fall Jan 4 · 351-day seasonSierra County · Spring Apr 23 · Fall Nov 13 · 204-day seasonFresno County · Spring Jan 4 · Fall Dec 24 · 354-day seasonAmador County · Spring Jan 10 · Fall Dec 27 · 351-day seasonEl Dorado County · Spring Apr 6 · Fall Nov 22 · 230-day seasonMonterey County · Spring Jan 22 · Fall Dec 6 · 318-day seasonSan Bernardino County · Spring Jan 30 · Fall Dec 8 · 312-day seasonTehama County · Spring Jan 13 · Fall Dec 15 · 336-day seasonNevada County · Spring Apr 16 · Fall Nov 23 · 221-day seasonTuolumne County · Spring Apr 16 · Fall Nov 20 · 218-day seasonSanta Barbara County · Spring Feb 27 · Fall Nov 27 · 273-day seasonTrinity County · Spring Mar 17 · Fall Nov 19 · 247-day seasonStanislaus County · Spring Jan 8 · Fall Dec 21 · 347-day seasonColusa County · Spring Jan 8 · Fall Dec 15 · 341-day seasonAlpine County · Spring Apr 24 · Fall Oct 18 · 177-day seasonSiskiyou County · Spring Apr 12 · Fall Nov 1 · 203-day seasonDel Norte County · Spring Jan 17 · Fall Dec 17 · 334-day seasonInyo County · Spring Dec 31 · Fall Dec 28 · 362-day seasonSan Joaquin County · Spring Jan 10 · Fall Dec 16 · 340-day seasonImperial County · Spring Jan 2 · Fall Dec 29 · 361-day seasonCalaveras County · Spring Jan 6 · Fall Dec 24 · 352-day seasonButte County · Spring Jan 5 · Fall Dec 31 · 360-day seasonMadera County · Spring Apr 5 · Fall Nov 20 · 229-day seasonVentura County · Spring Feb 17 · Fall Dec 1 · 287-day seasonOrange County · Spring — · Fall — · 0-day seasonKern County · Spring Mar 28 · Fall Dec 1 · 248-day seasonContra Costa County · Spring Feb 8 · Fall Jan 16 · 342-day seasonKings County · Spring Jan 24 · Fall Dec 12 · 322-day seasonMendocino County · Spring Mar 31 · Fall Oct 30 · 213-day seasonSonoma County · Spring Jan 23 · Fall Dec 5 · 316-day seasonYuba County · Spring Feb 27 · Fall Dec 1 · 277-day seasonMerced County · Spring Feb 12 · Fall Nov 29 · 290-day seasonTulare County · Spring Jan 20 · Fall Dec 14 · 328-day seasonSacramento County · Spring Dec 31 · Fall Dec 25 · 359-day seasonSolano County · Spring Dec 31 · Fall Dec 24 · 358-day seasonSan Francisco County · Spring — · Fall — · 0-day seasonMariposa County · Spring Apr 26 · Fall Nov 13 · 201-day seasonMarin County · Spring Dec 31 · Fall Dec 29 · 363-day seasonSutter County · Spring Jan 12 · Fall Dec 13 · 335-day seasonLassen County · Spring Apr 26 · Fall Oct 21 · 178-day seasonRiverside County · Spring Jan 15 · Fall Dec 13 · 332-day seasonPlumas County · Spring Apr 29 · Fall Oct 9 · 163-day seasonSanta Clara County · Spring Apr 10 · Fall Dec 7 · 241-day seasonPlacer County · Spring Mar 13 · Fall Dec 8 · 270-day seasonSan Luis Obispo County · Spring Jan 9 · Fall Jan 6 · 362-day seasonSan Mateo County · Spring Jan 5 · Fall Dec 31 · 360-day seasonMono County · Spring May 2 · Fall Oct 21 · 172-day seasonSan Diego County · Spring Jan 31 · Fall Dec 19 · 322-day seasonNapa County · Spring Feb 18 · Fall Dec 30 · 315-day seasonAlameda County · Spring Jan 10 · Fall Dec 18 · 342-day seasonYolo County · Spring Jan 10 · Fall Dec 18 · 342-day seasonLake County · Spring Mar 14 · Fall Nov 21 · 252-day seasonLos Angeles County · Spring — · Fall — · 0-day seasonGlenn County · Spring Mar 1 · Fall Nov 29 · 273-day seasonSanta Cruz County · Spring Jan 3 · Fall Dec 27 · 358-day seasonHumboldt County · Spring Jan 3 · Fall Dec 25 · 356-day seasonModoc County · Spring May 11 · Fall Sep 25 · 137-day season
Last spring frostEarliestMedianLatest
58 counties · click any county for full frost data
Alphabetical

All California counties — A to Z.

Frost dates set the calendar. Bield: Farm runs it.

Pair these dates with live forecasts for your specific farm location. Bield: Farm logs your soil tests, planting dates, weather, and yield outcomes year over year.

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