Frost dates in Wyoming
Across 129 NOAA stations in Wyoming, the average last spring frost ranges from April 28 at Basin to June 24 at Moose 1 Nne.
| Afton | June 20 | September 1 | 71 |
| Albin | May 14 | October 2 | 142 |
| Alta 1 Nnw | June 14 | September 11 | 85 |
| Archer | May 21 | September 24 | 124 |
| Baggs | June 1 | September 18 | 108 |
| Basin | April 28 | October 10 | 164 |
| Bates Creek #2 | May 22 | September 26 | 125 |
| Big Horn | May 17 | September 28 | 132 |
| Billy Creek | May 19 | September 21 | 123 |
| Bitter Creek 4 Ne | June 1 | September 16 | 106 |
| Black Mtn | May 14 | October 3 | 140 |
| Boysen Dam | May 5 | October 7 | 153 |
| Buckboard Marina | May 24 | September 23 | 118 |
| Buffalo | May 24 | September 21 | 118 |
| Buffalo Bill Dam | May 17 | October 3 | 136 |
| Buffalo Johnson Co Airport | May 13 | October 1 | 141 |
| Burris | June 1 | September 14 | 104 |
| Carpenter 3N | May 14 | September 26 | 133 |
| Casper 1Sw | May 12 | October 1 | 143 |
| Casper Natrona Co Airport | May 26 | September 22 | 117 |
| Casper Wwtp | May 10 | September 29 | 138 |
| Centennial 1Ne | June 2 | September 19 | 106 |
| Cheyenne | May 12 | October 1 | 141 |
| Cheyenne Wfo | May 14 | October 1 | 139 |
| Chugwater | May 18 | September 24 | 129 |
| Church Buttes Gas Plt | May 25 | September 27 | 124 |
| Clark 3Ne | May 18 | September 22 | 125 |
| Clearmont 5 Sw | May 24 | September 16 | 114 |
| Cody | May 12 | October 1 | 140 |
| Cody 12Se | May 24 | September 15 | 114 |
| Cody 21 Sw | May 29 | September 18 | 110 |
| Colony | May 7 | October 3 | 149 |
| Dayton | May 24 | September 18 | 114 |
| Deaver | May 6 | October 1 | 148 |
| Devils Twr #2 | May 23 | September 20 | 118 |
| Dillinger | May 25 | September 17 | 113 |
| Diversion Dam | May 21 | September 20 | 119 |
| Double Four Rch | June 2 | September 9 | 99 |
| Douglas 1 Se | May 19 | September 23 | 126 |
| Douglas Converse Co Airport | May 23 | September 22 | 122 |
| Dull Ctr 1Se | May 15 | September 27 | 133 |
| Echeta 2 Nw | May 21 | September 23 | 123 |
| Elk Mtn | May 28 | September 13 | 108 |
| Emblem | May 12 | September 28 | 136 |
| Evanston 1 E | June 12 | September 12 | 90 |
| Evanston Burns Fld | June 3 | September 25 | 113 |
| Gillette 4Se | May 15 | October 1 | 136 |
| Gillette Campbell Airport | May 22 | September 25 | 125 |
| Glendo 6Ne | May 25 | September 15 | 112 |
| Glendo Rsvr Usbr | May 9 | October 5 | 148 |
| Green Rvr | May 24 | September 22 | 120 |
| Greybull | May 11 | September 23 | 133 |
| Greybull S Big Horn Airport | May 4 | October 1 | 149 |
| Guernsey 2Nw | May 7 | October 6 | 152 |
| Guernsey Dam #2 | May 11 | October 3 | 144 |
| Heart Mtn | May 15 | September 25 | 132 |
| Hecla 1E | May 27 | September 19 | 115 |
| Hulett | May 17 | September 23 | 128 |
| Jeffrey City | June 1 | September 13 | 104 |
| Kaycee | May 18 | September 25 | 129 |
| La Barge | June 9 | September 4 | 84 |
| La Grange | May 14 | October 1 | 137 |
| Lance Creek 11Nne | May 17 | September 25 | 129 |
| Lander 11 Sse | May 13 | October 2 | 140 |
| Lander Hunt Fld Airport | May 18 | September 27 | 131 |
| Laramie 2 Nw | June 7 | September 4 | 88 |
| Laramie 4Se | May 22 | September 28 | 126 |
| Laramie Rgnl Airport | June 2 | September 15 | 102 |
| Leiter 9N | May 14 | September 30 | 137 |
| Leo 6 Sw | May 20 | September 28 | 128 |
| Lingle 2Wsw | May 20 | September 22 | 122 |
| Lovell | May 9 | September 29 | 142 |
| Lusk 2 Sw | May 23 | September 20 | 119 |
| Lusk 25Ne | May 14 | October 1 | 139 |
| Medicine Bow | June 1 | September 8 | 97 |
| Midwest | May 22 | September 22 | 121 |
| Moorcroft 3S | May 22 | September 28 | 127 |
| Moose | June 20 | August 31 | 70 |
| Moose 1 Nne | June 24 | August 28 | 63 |
| Mtn View | June 14 | September 9 | 84 |
| Muddy Gap | May 21 | September 27 | 126 |
| Newcastle | May 13 | October 3 | 143 |
| Old Ft Laramie | May 14 | September 26 | 134 |
| Pathfinder Dam | May 9 | October 7 | 148 |
| Pavillion | May 14 | September 30 | 139 |
| Phillips | May 21 | September 21 | 121 |
| Pine Bluffs 1Ese | May 10 | October 1 | 142 |
| Pine Bluffs 5W | May 16 | September 27 | 132 |
| Powder River #2 | May 23 | September 20 | 121 |
| Powder Rvr (School) | May 30 | September 22 | 115 |
| Powell Fld Stn | May 19 | September 20 | 123 |
| Rawlins 1N | May 17 | October 2 | 138 |
| Rawlins Muni Airport | June 1 | September 15 | 105 |
| Redbird | May 16 | September 24 | 130 |
| Riverton | May 12 | September 24 | 132 |
| Riverton | May 16 | September 28 | 133 |
| Rochelle 7Ene | May 25 | September 14 | 110 |
| Rock Springs Airport | May 22 | September 28 | 126 |
| Rock Springs Fire Dept | May 24 | September 24 | 121 |
| Saratoga | June 2 | September 12 | 101 |
| Saratoga 4N | June 12 | September 7 | 83 |
| Seminoe Rsvr Usbr | May 12 | October 4 | 143 |
| Shell | May 16 | September 24 | 130 |
| Sheridan Co Airport | May 21 | September 23 | 123 |
| Sheridan Fld Stn | May 18 | September 24 | 127 |
| Shoshoni | May 7 | October 3 | 145 |
| Story | May 24 | September 23 | 120 |
| Sundance | May 21 | September 25 | 124 |
| Sundance 8 Nnw | May 23 | September 24 | 121 |
| Sybille Rsch Unit | May 22 | September 24 | 125 |
| Tensleep 16Sse | May 22 | September 18 | 117 |
| Tensleep 4Ne | May 10 | October 1 | 141 |
| Thermopolis | May 5 | October 5 | 152 |
| Thermopolis 21Wnw | May 29 | September 17 | 110 |
| Thermopolis 9Ne | May 24 | September 16 | 112 |
| Torrington 29N | May 17 | September 28 | 133 |
| Torrington Exp Farm | May 14 | September 24 | 130 |
| Torrington Muni Airport | May 11 | September 29 | 139 |
| Upton | May 20 | September 23 | 123 |
| Wamsutter | June 5 | September 14 | 101 |
| Wapiti 1Wsw | May 27 | September 25 | 121 |
| Weston 1 E | May 23 | September 18 | 118 |
| Whalen Dam Usbr | May 7 | October 3 | 146 |
| Wheatland 4 N | May 19 | September 22 | 125 |
| Worland | May 13 | September 26 | 133 |
| Worland | May 4 | October 1 | 149 |
| Wright 12W | May 25 | September 23 | 120 |
| Yellowstone Park Mammoth | June 3 | September 14 | 102 |
| Yoder 5 W | May 15 | September 27 | 132 |
Sources
- U.S. Annual/Seasonal Climate Normals, 1991 to 2020 (freeze probability dates by station), NOAA National Centers for Environmental Information, checked 1 November 2026
- Annual/Seasonal Normals 1991 to 2020 documentation, NOAA National Centers for Environmental Information, checked 1 November 2026
- 2024 Gazetteer Files, ZIP Code Tabulation Areas, US Census Bureau, checked 1 November 2026