Bield:Farm
Frost dates · Wyoming

Wyoming frost dates,
county by county.

Last spring frost and first fall frost probability data for all 23 counties in Wyoming, 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 Wyoming

886 days separate the earliest and latest counties.

The median last spring frost in Hot Springs County is April 23 — 886 days earlier than Teton County at —. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.

By geography

Wyoming 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
Natrona County · Spring May 10 · Fall Oct 1 · 144-day seasonConverse County · Spring May 8 · Fall Oct 1 · 146-day seasonPark County · Spring May 11 · Fall Oct 5 · 147-day seasonLincoln County · Spring May 24 · Fall Sep 15 · 114-day seasonSublette County · Spring Jun 5 · Fall Sep 4 · 91-day seasonAlbany County · Spring May 7 · Fall Oct 4 · 150-day seasonPlatte County · Spring May 9 · Fall Oct 1 · 145-day seasonCrook County · Spring May 6 · Fall Oct 3 · 150-day seasonGoshen County · Spring May 9 · Fall Oct 1 · 145-day seasonJohnson County · Spring May 8 · Fall Sep 30 · 145-day seasonSweetwater County · Spring May 7 · Fall Oct 5 · 151-day seasonTeton County · Spring — · Fall — · 0-day seasonSheridan County · Spring May 7 · Fall Oct 3 · 149-day seasonNiobrara County · Spring May 5 · Fall Oct 5 · 153-day seasonUinta County · Spring May 30 · Fall Sep 20 · 113-day seasonWashakie County · Spring May 1 · Fall Oct 5 · 157-day seasonFremont County · Spring May 3 · Fall Oct 7 · 157-day seasonWeston County · Spring May 9 · Fall Oct 2 · 146-day seasonBig Horn County · Spring May 2 · Fall Oct 3 · 154-day seasonHot Springs County · Spring Apr 23 · Fall Oct 15 · 175-day seasonLaramie County · Spring May 9 · Fall Oct 1 · 145-day seasonCarbon County · Spring May 17 · Fall Sep 26 · 132-day seasonCampbell County · Spring May 2 · Fall Oct 10 · 161-day season
Last spring frostEarliestMedianLatest
23 counties · click any county for full frost data
Alphabetical

All Wyoming 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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