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 polygon is a county. Click for full frost-date detail. Color shows last-spring-frost timing — sage = earliest, amber = latest.
MapList
Last spring frostEarliestMedianLatest
39 counties · click any county for full frost data