Bield:Farm
Frost dates · Washington

Washington frost dates,
county by county.

Last spring frost and first fall frost probability data for all 39 counties in Washington, 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 Washington

83 days separate the earliest and latest counties.

The median last spring frost in Grays Harbor County is February 18 — 83 days earlier than Ferry County at May 12. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.

By geography

Washington 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
Pierce County · Spring Mar 16 · Fall Nov 14 · 243-day seasonAdams County · Spring Apr 23 · Fall Oct 17 · 177-day seasonPend Oreille County · Spring May 4 · Fall Sep 28 · 147-day seasonKing County · Spring Feb 27 · Fall Nov 29 · 275-day seasonChelan County · Spring May 3 · Fall Oct 4 · 154-day seasonKittitas County · Spring Apr 11 · Fall Oct 20 · 192-day seasonGarfield County · Spring Apr 11 · Fall Oct 19 · 191-day seasonGrant County · Spring Apr 6 · Fall Oct 27 · 204-day seasonOkanogan County · Spring Apr 14 · Fall Oct 19 · 188-day seasonFranklin County · Spring Apr 10 · Fall Oct 24 · 197-day seasonKlickitat County · Spring May 1 · Fall Oct 7 · 159-day seasonClark County · Spring Mar 29 · Fall Nov 5 · 221-day seasonSkagit County · Spring Feb 25 · Fall Dec 2 · 280-day seasonWalla Walla County · Spring Mar 4 · Fall Nov 14 · 255-day seasonPacific County · Spring Mar 27 · Fall Nov 7 · 225-day seasonCowlitz County · Spring Mar 6 · Fall Nov 24 · 263-day seasonWahkiakum County · Spring Mar 25 · Fall Nov 12 · 232-day seasonLewis County · Spring Mar 6 · Fall Dec 1 · 270-day seasonClallam County · Spring Mar 4 · Fall Nov 24 · 265-day seasonGrays Harbor County · Spring Feb 18 · Fall Dec 6 · 291-day seasonJefferson County · Spring Mar 4 · Fall Nov 24 · 265-day seasonLincoln County · Spring May 9 · Fall Oct 1 · 145-day seasonMason County · Spring Feb 20 · Fall Dec 7 · 290-day seasonSan Juan County · Spring Feb 22 · Fall Dec 1 · 282-day seasonStevens County · Spring Apr 30 · Fall Sep 28 · 151-day seasonWhatcom County · Spring Mar 28 · Fall Nov 17 · 234-day seasonDouglas County · Spring Mar 29 · Fall Nov 4 · 220-day seasonSnohomish County · Spring Mar 18 · Fall Nov 12 · 239-day seasonThurston County · Spring Apr 5 · Fall Nov 1 · 210-day seasonColumbia County · Spring Apr 6 · Fall Oct 25 · 202-day seasonYakima County · Spring Mar 16 · Fall Nov 3 · 232-day seasonBenton County · Spring Mar 23 · Fall Nov 2 · 224-day seasonIsland County · Spring Feb 21 · Fall Nov 28 · 280-day seasonSpokane County · Spring Apr 4 · Fall Oct 27 · 206-day seasonWhitman County · Spring Apr 5 · Fall Oct 20 · 198-day seasonFerry County · Spring May 12 · Fall Sep 24 · 135-day seasonSkamania County · Spring Apr 7 · Fall Oct 30 · 206-day seasonAsotin County · Spring Mar 15 · Fall Nov 8 · 238-day seasonKitsap County · Spring Feb 27 · Fall Nov 30 · 276-day season
Last spring frostEarliestMedianLatest
39 counties · click any county for full frost data
Alphabetical

All Washington 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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