Frost dates · Utah
Utah frost dates, county by county.
Last spring frost and first fall frost probability data for all 29 counties in Utah, 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 Utah
103 days separate the earliest and latest counties.
The median last spring frost in Salt Lake County is March 8 — 103 days earlier than Summit County at June 19. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.
By geography
Utah 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
29 counties · click any county for full frost data