Last frost dates in Wyoming

Typical last frost
May 14

That is the date for the typical Wyoming resident, weighted by city population. Across the state the average last frost runs from May 10 to June 7, so look up your own town below.

Earliest city
May 10
Latest city
Jun 7
Typical first frost
Sep 29
Cities
6
This week in Wyoming

Frost in the forecast for 6 of 6 cities

National Weather Service forecast, updated Oct 22, 11:10 UTC

Jun 1May 15NSCheyenne: May 14CheyenneCasper: May 10CasperGillette: May 15GilletteLaramie: Jun 7LaramieRock Springs: May 24Rock SpringsSheridan: May 21Sheridan
Each dot is a city: further right means a later last frost, higher up means further north. Bigger dots are bigger cities.

Frost dates by city

CityLast frostSafe afterFirst frostSeason
CheyenneMay 14May 28Oct 1139 days
CasperMay 10May 24Sep 29138 days
GilletteMay 15May 27Oct 1136 days
LaramieJun 7Jun 29Sep 488 days
Rock SpringsMay 24Jun 9Sep 24121 days
SheridanMay 21Jun 6Sep 23123 days

When to plant in Wyoming

Questions

When is the last frost in Wyoming?

It depends on where you are. Across the 6 cities we track, the average last frost runs from May 10 to June 7. In Cheyenne, the largest, it is May 14.

When is the first frost in Wyoming?

For a typical resident, around September 29. Higher and more northern towns get it earlier.