First and last frost dates in Wyoming
Compare median spring and fall freeze dates for 30 locations in Wyoming. Open a city guide for station details and risk levels.
| Location | Last spring freeze | First fall freeze | Days between | Guide |
|---|---|---|---|---|
| Afton | June 20 | September 1 | 73 days | |
| Antelope Valley-Crestview | May 15 | October 1 | 139 days | |
| Arapahoe | May 16 | September 28 | 135 days | |
| Bar Nunn | May 10 | September 29 | 142 days | |
| Basin | April 28 | October 10 | 165 days | |
| Buffalo | May 24 | September 21 | 120 days | |
| Casper | May 10 | September 29 | 142 days | |
| Douglas | May 19 | September 23 | 127 days | |
| Evanston | June 12 | September 12 | 92 days | |
| Evansville | May 12 | October 1 | 142 days | |
| Glenrock | May 12 | October 1 | 142 days | |
| Green River | May 24 | September 22 | 121 days | |
| Greybull | May 11 | September 23 | 135 days | |
| Guernsey | May 7 | October 6 | 152 days | |
| Lovell | May 9 | September 29 | 143 days | |
| Lusk | May 23 | September 20 | 120 days | |
| Lyman | June 14 | September 9 | 87 days | |
| Moorcroft | May 22 | September 28 | 129 days | |
| Mountain View | June 14 | September 9 | 87 days | |
| Newcastle | May 13 | October 3 | 143 days | |
| Pine Bluffs | May 10 | October 1 | 144 days | |
| Rawlins | May 17 | October 2 | 138 days | |
| Riverton | May 12 | September 24 | 135 days | |
| Saratoga | June 2 | September 12 | 102 days | |
| Sleepy Hollow | May 15 | October 1 | 139 days | |
| Sundance | May 21 | September 25 | 127 days | |
| Thermopolis | May 5 | October 5 | 153 days | |
| Upton | May 20 | September 23 | 126 days | |
| Wheatland | May 19 | September 22 | 126 days | |
| Wright | May 25 | September 23 | 121 days |
Median dates at nearby stations, using a 32°F (0°C) threshold. The interval is calculated from the two median dates, not a guarantee of frost-free weather. Read the methodology.