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 frost timing
Counties sorted by last spring frost.
Latest at top, earliest at bottom. In most states this matches the north-to-south gradient.
- Summit CountySpring Jun 19·Fall Sep 982-day season
- Rich CountySpring May 30·Fall Sep 11104-day season
- Wasatch CountySpring May 17·Fall Oct 1137-day season
- Sanpete CountySpring May 12·Fall Sep 29140-day season
- Daggett CountySpring May 10·Fall Oct 3146-day season
- Morgan CountySpring May 8·Fall Oct 4149-day season
- Piute CountySpring May 8·Fall Oct 3148-day season
- Millard CountySpring May 7·Fall Oct 5151-day season
- Sevier CountySpring May 7·Fall Oct 4150-day season
- Iron CountySpring May 6·Fall Oct 9156-day season
- Emery CountySpring May 4·Fall Oct 5154-day season
- Weber CountySpring May 4·Fall Oct 6155-day season
- Box Elder CountySpring May 3·Fall Oct 12162-day season
- Juab CountySpring May 2·Fall Oct 10161-day season
- Beaver CountySpring Apr 28·Fall Oct 12167-day season
- Tooele CountySpring Apr 28·Fall Oct 12167-day season
- San Juan CountySpring Apr 24·Fall Oct 23182-day season
- Garfield CountySpring Apr 23·Fall Oct 23183-day season
- Carbon CountySpring Apr 22·Fall Oct 22183-day season
- Duchesne CountySpring Apr 22·Fall Oct 16177-day season
- Uintah CountySpring Apr 19·Fall Oct 13177-day season
- Cache CountySpring Apr 15·Fall Oct 27195-day season
- Utah CountySpring Apr 9·Fall Oct 30204-day season
- Grand CountySpring Apr 8·Fall Oct 30205-day season
- Kane CountySpring Apr 3·Fall Nov 2213-day season
- Davis CountySpring Apr 1·Fall Nov 1214-day season
- Wayne CountySpring Mar 31·Fall Nov 7221-day season
- Washington CountySpring Mar 18·Fall Nov 16243-day season
- Salt Lake CountySpring Mar 8·Fall Nov 18255-day season
Alphabetical
All Utah counties — A to Z.
- Beaver County
- Box Elder County
- Cache County
- Carbon County
- Daggett County
- Davis County
- Duchesne County
- Emery County
- Garfield County
- Grand County
- Iron County
- Juab County
- Kane County
- Millard County
- Morgan County
- Piute County
- Rich County
- Salt Lake County
- San Juan County
- Sanpete County
- Sevier County
- Summit County
- Tooele County
- Uintah County
- Utah County
- Wasatch County
- Washington County
- Wayne County
- Weber County