Wyoming Frost Dates
The median last spring freeze and first fall freeze (32°F) at 129 NOAA stations in Wyoming, 1991-2020, with the growing season between them.
Every station
A median date has an even chance of a later freeze in spring or an earlier one in fall. Each town page gives the dates at 36, 32 and 28°F and every probability from 10 to 90 percent.
| Station | Elevation | Last freeze | First freeze | Season, days | Town page |
|---|---|---|---|---|---|
| Afton | 6,248 ft | June 20 | September 1 | 73 | Afton |
| Albin | 5,345 ft | May 14 | October 2 | 141 | Pine Bluffs |
| Alta 1 Nnw | 6,440 ft | June 14 | September 11 | 89 | |
| Archer | 6,010 ft | May 21 | September 24 | 126 | Fox Farm-College |
| Baggs | 6,319 ft | June 1 | September 18 | 109 | |
| Basin | 3,840 ft | April 28 | October 10 | 165 | Basin |
| Bates Creek #2 | 6,042 ft | May 22 | September 26 | 127 | Mills |
| Big Horn | 4,208 ft | May 17 | September 28 | 134 | Sheridan |
| Billy Creek | 4,975 ft | May 19 | September 21 | 125 | Buffalo |
| Bitter Creek 4 Ne | 6,722 ft | June 1 | September 16 | 107 | Rock Springs |
| Black Mtn | 5,635 ft | May 14 | October 3 | 142 | Lucerne |
| Boysen Dam | 4,875 ft | May 5 | October 7 | 155 | Shoshoni |
| Buckboard Marina | 6,080 ft | May 24 | September 23 | 122 | |
| Buffalo | 4,639 ft | May 24 | September 21 | 120 | Buffalo |
| Buffalo Bill Dam | 5,160 ft | May 17 | October 3 | 139 | Cody |
| Buffalo Johnson CO AP | 4,967 ft | May 13 | October 1 | 141 | Buffalo |
| Burris | 6,125 ft | June 1 | September 14 | 105 | Dubois |
| Carpenter 3N | 5,437 ft | May 14 | September 26 | 135 | Pine Bluffs |
| Casper 1SW | 5,143 ft | May 12 | October 1 | 142 | Evansville |
| Casper Natrona CO AP | 5,338 ft | May 26 | September 22 | 119 | Vista West |
| Casper Wwtp | 5,097 ft | May 10 | September 29 | 142 | Casper |
| Centennial 1NE | 8,170 ft | June 2 | September 19 | 109 | Laramie |
| Cheyenne | 6,128 ft | May 12 | October 1 | 142 | Cheyenne |
| Cheyenne WFO | 6,119 ft | May 14 | October 1 | 140 | Cheyenne |
| Chugwater | 5,304 ft | May 18 | September 24 | 129 | Wheatland |
| Church Buttes Gas Plt | 7,079 ft | May 25 | September 27 | 125 | Lyman |
| Clark 3NE | 4,117 ft | May 18 | September 22 | 127 | |
| Clearmont 5 Sw | 3,995 ft | May 24 | September 16 | 115 | Buffalo |
| Cody | 5,280 ft | May 12 | October 1 | 142 | Cody |
| Cody 12SE | 5,248 ft | May 24 | September 15 | 114 | Cody |
| Cody 21 Sw | 5,840 ft | May 29 | September 18 | 112 | Cody |
| Colony | 3,480 ft | May 7 | October 3 | 149 | |
| Dayton | 3,920 ft | May 24 | September 18 | 117 | Dayton |
| Deaver | 4,105 ft | May 6 | October 1 | 148 | Cowley |
| Devils Twr #2 | 3,862 ft | May 23 | September 20 | 120 | Pine Haven |
| Dillinger | 4,310 ft | May 25 | September 17 | 115 | Moorcroft |
| Diversion Dam | 5,578 ft | May 21 | September 20 | 122 | Fort Washakie |
| Double Four Rch | 6,120 ft | June 2 | September 9 | 99 | Wheatland |
| Douglas 1 Se | 4,870 ft | May 19 | September 23 | 127 | Douglas |
| Douglas Converse CO AP | 4,929 ft | May 23 | September 22 | 122 | Douglas |
| Dull Ctr 1SE | 4,415 ft | May 15 | September 27 | 135 | Wright |
| Echeta 2 Nw | 4,000 ft | May 21 | September 23 | 125 | Gillette |
| Elk Mtn | 7,265 ft | May 28 | September 13 | 108 | Hanna |
| Emblem | 4,448 ft | May 12 | September 28 | 139 | Greybull |
| Evanston 1 E | 6,825 ft | June 12 | September 12 | 92 | Evanston |
| Evanston Burns Fld | 7,163 ft | June 3 | September 25 | 114 | Evanston |
| Gillette 4SE | 4,640 ft | May 15 | October 1 | 139 | Sleepy Hollow |
| Gillette Campbell AP | 4,354 ft | May 22 | September 25 | 126 | Gillette |
| Glendo 6NE | 4,739 ft | May 25 | September 15 | 113 | Guernsey |
| Glendo Rsvr Usbr | 4,780 ft | May 9 | October 5 | 149 | Guernsey |
| Green Rvr | 6,160 ft | May 24 | September 22 | 121 | Green River |
| Greybull | 3,787 ft | May 11 | September 23 | 135 | Greybull |
| Greybull S Big Horn AP | 3,933 ft | May 4 | October 1 | 150 | Greybull |
| Guernsey 2NW | 4,480 ft | May 7 | October 6 | 152 | Guernsey |
| Guernsey Dam #2 | 4,355 ft | May 11 | October 3 | 145 | Guernsey |
| Heart Mtn | 4,790 ft | May 15 | September 25 | 133 | Powell |
| Hecla 1E | 6,690 ft | May 27 | September 19 | 115 | Cheyenne |
| Hulett | 3,758 ft | May 17 | September 23 | 129 | Sundance |
| Jeffrey City | 6,319 ft | June 1 | September 13 | 104 | Riverton |
| Kaycee | 4,660 ft | May 18 | September 25 | 130 | Buffalo |
| La Barge | 6,598 ft | June 9 | September 4 | 87 | La Barge |
| La Grange | 4,590 ft | May 14 | October 1 | 140 | |
| Lance Creek 11NNE | 4,204 ft | May 17 | September 25 | 131 | Lusk |
| Lander 11 Sse | 5,773 ft | May 13 | October 2 | 142 | Lander |
| Lander Hunt Fld AP | 5,592 ft | May 18 | September 27 | 132 | Lander |
| Laramie 2 Nw | 7,140 ft | June 7 | September 4 | 89 | Laramie |
| Laramie 4SE | 7,390 ft | May 22 | September 28 | 129 | Laramie |
| Laramie Rgnl AP | 7,266 ft | June 2 | September 15 | 105 | Laramie |
| Leiter 9N | 4,160 ft | May 14 | September 30 | 139 | Sheridan |
| Leo 6 Sw | 6,035 ft | May 20 | September 28 | 131 | Hanna |
| Lingle 2WSW | 4,158 ft | May 20 | September 22 | 125 | Torrington |
| Lovell | 3,847 ft | May 9 | September 29 | 143 | Lovell |
| Lusk 2 Sw | 5,090 ft | May 23 | September 20 | 120 | Lusk |
| Lusk 25NE | 4,136 ft | May 14 | October 1 | 140 | |
| Medicine Bow | 6,635 ft | June 1 | September 8 | 99 | Hanna |
| Midwest | 4,860 ft | May 22 | September 22 | 123 | Bar Nunn |
| Moorcroft 3S | 4,325 ft | May 22 | September 28 | 129 | Moorcroft |
| Moose | 6,444 ft | June 20 | August 31 | 72 | Moose Wilson Road |
| Moose 1 Nne | 6,466 ft | June 24 | August 28 | 65 | Moose Wilson Road |
| Mtn View | 6,800 ft | June 14 | September 9 | 87 | Mountain View |
| Muddy Gap | 6,248 ft | May 21 | September 27 | 129 | Rawlins |
| Newcastle | 4,415 ft | May 13 | October 3 | 143 | Newcastle |
| Old Ft Laramie | 4,250 ft | May 14 | September 26 | 135 | Guernsey |
| Pathfinder Dam | 5,923 ft | May 9 | October 7 | 151 | Vista West |
| Pavillion | 5,480 ft | May 14 | September 30 | 139 | Ethete |
| Phillips | 4,982 ft | May 21 | September 21 | 123 | Ranchettes |
| Pine Bluffs 1ESE | 5,058 ft | May 10 | October 1 | 144 | Pine Bluffs |
| Pine Bluffs 5W | 5,180 ft | May 16 | September 27 | 134 | Pine Bluffs |
| Powder River #2 | 5,700 ft | May 23 | September 20 | 120 | Vista West |
| Powder Rvr (school) | 5,722 ft | May 30 | September 22 | 115 | Vista West |
| Powell Fld Stn | 4,372 ft | May 19 | September 20 | 124 | Powell |
| Rawlins 1N | 6,908 ft | May 17 | October 2 | 138 | Rawlins |
| Rawlins Muni AP | 6,736 ft | June 1 | September 15 | 106 | Rawlins |
| Redbird | 3,890 ft | May 16 | September 24 | 131 | |
| Riverton | 4,955 ft | May 12 | September 24 | 135 | Riverton |
| Riverton | 5,568 ft | May 16 | September 28 | 135 | Riverton |
| Rochelle 7ENE | 4,239 ft | May 25 | September 14 | 112 | Upton |
| Rock Springs AP | 6,741 ft | May 22 | September 28 | 129 | Rock Springs |
| Rock Springs Fire Dept | 6,270 ft | May 24 | September 24 | 123 | Clearview Acres |
| Saratoga | 6,790 ft | June 2 | September 12 | 102 | Saratoga |
| Saratoga 4N | 6,801 ft | June 12 | September 7 | 87 | Saratoga |
| Seminoe Rsvr Usbr | 6,975 ft | May 12 | October 4 | 145 | Hanna |
| Shell | 4,242 ft | May 16 | September 24 | 131 | Greybull |
| Sheridan CO AP | 3,945 ft | May 21 | September 23 | 125 | Sheridan |
| Sheridan Fld Stn | 3,750 ft | May 18 | September 24 | 129 | Sheridan |
| Shoshoni | 4,837 ft | May 7 | October 3 | 149 | Shoshoni |
| Story | 5,168 ft | May 24 | September 23 | 122 | Story |
| Sundance | 4,695 ft | May 21 | September 25 | 127 | Sundance |
| Sundance 8 Nnw | 5,792 ft | May 23 | September 24 | 124 | Sundance |
| Sybille Rsch Unit | 6,086 ft | May 22 | September 24 | 125 | Wheatland |
| Tensleep 16SSE | 4,680 ft | May 22 | September 18 | 119 | Worland |
| Tensleep 4NE | 4,748 ft | May 10 | October 1 | 144 | Washakie Ten |
| Thermopolis | 4,321 ft | May 5 | October 5 | 153 | Thermopolis |
| Thermopolis 21WNW | 5,510 ft | May 29 | September 17 | 111 | Thermopolis |
| Thermopolis 9NE | 4,282 ft | May 24 | September 16 | 115 | Lucerne |
| Torrington 29N | 4,860 ft | May 17 | September 28 | 134 | |
| Torrington Exp Farm | 4,098 ft | May 14 | September 24 | 133 | Torrington |
| Torrington Muni AP | 4,205 ft | May 11 | September 29 | 141 | Torrington |
| Upton | 4,320 ft | May 20 | September 23 | 126 | Upton |
| Wamsutter | 6,740 ft | June 5 | September 14 | 101 | Rawlins |
| Wapiti 1WSW | 5,558 ft | May 27 | September 25 | 121 | Cody |
| Weston 1 E | 3,738 ft | May 23 | September 18 | 118 | Gillette |
| Whalen Dam Usbr | 4,294 ft | May 7 | October 3 | 149 | Guernsey |
| Wheatland 4 N | 4,638 ft | May 19 | September 22 | 126 | Wheatland |
| Worland | 4,058 ft | May 4 | October 1 | 150 | Worland |
| Worland | 4,172 ft | May 13 | September 26 | 136 | Worland |
| Wright 12W | 5,020 ft | May 25 | September 23 | 121 | Wright |
| Yellowstone Park Mammoth | 6,195 ft | June 3 | September 14 | 103 | |
| Yoder 5 W | 4,330 ft | May 15 | September 27 | 135 | Torrington |
Sources
NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal freeze probabilities. Public domain.