Colorado Frost Dates
The median last spring freeze and first fall freeze (32°F) at 210 NOAA stations in Colorado, 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 |
|---|---|---|---|---|---|
| Akron 4 E | 4,542 ft | May 8 | October 6 | 151 | Akron |
| Akron Washington CO AP | 4,663 ft | May 6 | October 8 | 155 | Akron |
| Alamosa 1E | 7,540 ft | May 30 | September 17 | 110 | Alamosa |
| Alamosa San Luis AP | 7,534 ft | June 7 | September 15 | 100 | Alamosa |
| Allenspark 3NW | 8,500 ft | June 14 | September 12 | 90 | Allenspark |
| Altenbern | 5,637 ft | May 25 | September 25 | 123 | Parachute |
| Arapahoe 12S | 4,065 ft | May 5 | October 9 | 157 | Cheyenne Wells |
| Arapahoe 14N | 4,142 ft | May 9 | October 7 | 151 | Cheyenne Wells |
| Aspen 1SW | 8,175 ft | June 2 | September 23 | 113 | Aspen |
| Aspen Pitkin CO AP | 7,721 ft | May 31 | September 23 | 115 | Aspen |
| Bailey | 7,752 ft | June 16 | September 8 | 84 | Bailey |
| Black Canyon Of The Gunnison | 8,151 ft | May 23 | October 1 | 131 | Montrose |
| Black Forest 6WNW | 6,957 ft | May 11 | October 6 | 148 | Gleneagle |
| Blanca 4 Nw | 7,709 ft | May 25 | September 22 | 120 | Alamosa East |
| Blue Mesa Lake | 7,568 ft | June 9 | September 16 | 99 | Gunnison |
| Bonny Dam 2NE | 3,717 ft | May 5 | October 10 | 158 | |
| Boulder | 5,484 ft | May 6 | October 5 | 152 | Boulder |
| Boulder 14 W | 9,829 ft | June 21 | September 2 | 73 | Nederland |
| Briggsdale | 4,862 ft | May 12 | September 28 | 139 | Kersey |
| Brighton 3 Se | 5,016 ft | May 3 | October 7 | 157 | Brighton |
| Buckhorn Mtn 1 E | 7,400 ft | May 21 | September 29 | 131 | Laporte |
| Buena Vista 2S | 7,954 ft | May 27 | September 23 | 119 | Buena Vista |
| Burlington | 4,162 ft | May 6 | October 9 | 156 | Burlington |
| Burlington Carson AP | 4,192 ft | May 2 | October 10 | 161 | Burlington |
| Byers 5 Ene | 5,101 ft | May 13 | October 2 | 142 | Byers |
| Cabin Creek | 10,021 ft | June 6 | September 19 | 105 | Georgetown |
| Campo 7 S | 4,105 ft | April 29 | October 13 | 167 | |
| Canon City | 5,378 ft | May 4 | October 7 | 156 | Cañon City |
| Castle Rock | 6,185 ft | May 9 | October 2 | 146 | Castle Pines |
| Cedaredge 3E | 6,838 ft | May 3 | October 9 | 159 | Cedaredge |
| Center 4 Ssw | 7,673 ft | May 24 | September 24 | 123 | Center |
| Cheesman | 6,880 ft | May 17 | October 1 | 137 | Perry Park |
| Cheraw 1 N | 4,147 ft | April 30 | October 10 | 163 | North La Junta |
| Cherry Creek Dam | 5,647 ft | May 7 | October 8 | 154 | Cherry Creek |
| Cheyenne Wells 2NE | 4,203 ft | May 1 | October 14 | 166 | Cheyenne Wells |
| Cimarron | 6,890 ft | June 20 | September 10 | 82 | Montrose |
| Coal Creek Canyon | 8,951 ft | June 5 | September 16 | 103 | Coal Creek |
| Cochetopa Creek | 8,006 ft | June 21 | September 5 | 76 | Gunnison |
| Collbran 1WSW | 6,009 ft | May 17 | September 30 | 136 | Collbran |
| Colorado Nm | 5,781 ft | April 26 | October 16 | 173 | Fruita |
| Colorado Springs Muni AP | 6,181 ft | May 3 | October 8 | 158 | Cimarron Hills |
| Cortez | 6,167 ft | May 12 | October 7 | 148 | Cortez |
| Cortez 8 Se | 8,035 ft | May 6 | October 14 | 161 | Cortez |
| Cortez Montezuma CO AP | 5,914 ft | May 27 | September 28 | 124 | Cortez |
| Craig 4SW | 6,496 ft | May 29 | September 20 | 114 | Craig |
| Craig Moffat CO AP | 6,186 ft | June 6 | September 12 | 98 | Craig |
| Crestone 2 Se | 8,004 ft | May 26 | September 26 | 123 | Westcliffe |
| Cripple Creek 3NNW | 9,235 ft | May 26 | September 26 | 123 | Cripple Creek |
| Crook | 3,709 ft | May 11 | October 4 | 146 | Haxtun |
| Cumbre Vista - Colorado Spgs 1 | 6,942 ft | May 9 | October 6 | 150 | Black Forest |
| Del Norte 3ENE | 7,846 ft | May 23 | September 25 | 125 | Del Norte |
| Delta 3E | 5,027 ft | May 1 | October 7 | 159 | Delta |
| Denver Centennial AP | 5,883 ft | May 5 | October 8 | 156 | Inverness |
| Denver Intl AP | 5,414 ft | May 5 | October 9 | 157 | Aetna Estates |
| Denver Water Dept | 5,228 ft | April 30 | October 12 | 165 | Denver |
| Denver-Stapleton | 5,286 ft | May 4 | October 8 | 157 | Aurora |
| Dinosaur 2 E | 6,062 ft | May 2 | October 14 | 165 | Rangely |
| Dinosaur Nm | 5,960 ft | May 12 | October 5 | 146 | Rangely |
| Divide 4NW | 9,134 ft | June 1 | September 21 | 112 | Woodland Park |
| Dove Creek | 6,863 ft | May 11 | October 12 | 154 | Dove Creek |
| Durango | 6,761 ft | May 21 | October 2 | 134 | Durango |
| Durango La Plata CO AP | 6,660 ft | June 1 | September 27 | 118 | Ignacio |
| Eads | 4,212 ft | April 30 | October 13 | 166 | Eads |
| Eastonville 2 Nnw | 7,210 ft | May 29 | September 21 | 115 | Black Forest |
| Elizabeth 2NW | 6,611 ft | May 16 | October 2 | 139 | Elizabeth |
| Ellicott 7S | 5,739 ft | May 6 | October 3 | 150 | Ellicott |
| Estes Park 3 Sse | 7,812 ft | May 30 | September 17 | 110 | Estes Park |
| Evergreen | 6,985 ft | May 23 | September 22 | 122 | Evergreen |
| Fairplay S Park Rd | 9,996 ft | June 16 | September 9 | 85 | Fairplay |
| Flagler 1S | 4,921 ft | May 5 | October 8 | 156 | Flagler |
| Fleming 3SW | 4,256 ft | May 4 | October 11 | 160 | Haxtun |
| Fruita | 4,498 ft | April 27 | October 11 | 167 | Fruita |
| Ft Collins | 5,004 ft | May 2 | October 7 | 158 | Fort Collins |
| Ft Collins 4 E | 4,920 ft | May 3 | October 6 | 156 | Fort Collins |
| Ft Lewis | 7,614 ft | June 1 | September 27 | 118 | Durango |
| Ft Morgan | 4,376 ft | May 6 | October 6 | 153 | Log Lane Village |
| Gateway 1ENE | 4,671 ft | April 20 | October 21 | 184 | Redlands |
| Genoa | 5,593 ft | May 8 | October 10 | 155 | Hugo |
| Georgetown | 8,520 ft | May 30 | September 19 | 112 | Georgetown |
| Glade Park 17W | 6,323 ft | May 21 | September 26 | 128 | Loma |
| Glenwood Spgs #2 | 5,895 ft | May 13 | October 3 | 143 | Glenwood Springs |
| Grand Junction 6ESE | 4,760 ft | April 23 | October 20 | 180 | Fruitvale |
| Grand Junction Walker Fld | 4,858 ft | April 28 | October 16 | 171 | Fruitvale |
| Grand Junction WFO | 4,826 ft | April 14 | October 23 | 192 | Fruitvale |
| Grand Lake 6 Ssw | 8,288 ft | June 13 | September 7 | 86 | Granby |
| Grant | 8,675 ft | June 15 | September 9 | 86 | Bailey |
| Great Sand Dunes Np & Preserve | 8,183 ft | May 21 | October 1 | 133 | Alamosa East |
| Greeley Unc | 4,715 ft | May 2 | October 8 | 159 | Greeley |
| Green Mt Dam | 7,741 ft | June 6 | September 14 | 100 | Kremmling |
| Gross Rsvr | 7,971 ft | May 24 | September 23 | 122 | Coal Creek |
| Guffey 9SE | 8,915 ft | May 19 | October 2 | 136 | Cripple Creek |
| Hayden | 6,467 ft | June 1 | September 20 | 111 | Hayden |
| Holly | 3,401 ft | May 1 | October 12 | 164 | Holly |
| Holyoke | 3,780 ft | May 11 | October 3 | 145 | Holyoke |
| Hugo 1 Nw | 5,025 ft | May 10 | October 2 | 145 | Hugo |
| Idalia | 3,965 ft | May 4 | October 9 | 158 | Wray |
| Ignacio 6ESE | 6,548 ft | May 23 | September 29 | 129 | Ignacio |
| Joes | 4,275 ft | May 3 | October 9 | 159 | Stratton |
| John Martin Dam | 3,814 ft | April 24 | October 15 | 174 | Las Animas |
| Julesburg | 3,477 ft | May 7 | October 6 | 152 | Julesburg |
| Karval | 5,075 ft | May 9 | October 6 | 150 | Hugo |
| Kassler | 5,587 ft | May 8 | October 3 | 148 | Roxborough Park |
| Kim 10SSE | 5,257 ft | April 24 | October 18 | 177 | Springfield |
| Kim 15 Nne | 5,190 ft | May 5 | October 9 | 157 | La Junta |
| Kit Carson | 4,302 ft | May 10 | October 1 | 144 | Eads |
| Kit Carson 9NNE | 4,346 ft | May 7 | October 6 | 152 | Cheyenne Wells |
| Kremmling | 7,460 ft | June 14 | September 5 | 83 | Kremmling |
| La Junta | 4,089 ft | April 26 | October 15 | 172 | La Junta |
| La Junta 17 Wsw | 4,386 ft | May 8 | October 4 | 149 | Rocky Ford |
| La Junta 20 S | 4,210 ft | April 27 | October 14 | 170 | La Junta |
| La Junta Muni AP | 4,194 ft | April 24 | October 15 | 174 | North La Junta |
| Lake City | 8,667 ft | June 8 | September 17 | 101 | Lake City |
| Lake City 1NNE | 8,714 ft | June 9 | September 17 | 100 | Lake City |
| Lake George 8 Sw | 8,550 ft | June 2 | September 19 | 109 | Cripple Creek |
| Lakewood | 5,640 ft | May 3 | October 7 | 157 | Applewood |
| Lamar | 3,627 ft | April 30 | October 10 | 163 | Lamar |
| Lamar Muni AP | 3,704 ft | May 2 | October 7 | 158 | Lamar |
| Las Animas | 3,890 ft | April 29 | October 12 | 166 | Las Animas |
| Lemon Dam | 8,110 ft | May 28 | September 30 | 125 | Bayfield |
| Leroy 5 Wsw | 4,467 ft | May 10 | October 6 | 149 | Sterling |
| Limon Wsmo | 5,364 ft | May 21 | September 26 | 128 | Limon |
| Lindon 5 Wnw | 4,851 ft | May 15 | October 2 | 140 | Deer Trail |
| Longmont 2 Ese | 4,950 ft | May 7 | October 5 | 151 | Longmont |
| Loveland 2N | 5,080 ft | May 10 | October 1 | 144 | Loveland |
| Manassa | 7,695 ft | May 28 | September 21 | 116 | Manassa |
| Mancos 1SW | 6,897 ft | June 4 | September 24 | 112 | Mancos |
| Marston Fltr Plt | 5,610 ft | May 2 | October 11 | 162 | Bow Mar |
| Massadona 3E | 6,140 ft | May 10 | October 4 | 147 | Rangely |
| Matheson 8 Se | 5,830 ft | May 12 | October 2 | 143 | Limon |
| Maybell | 5,944 ft | June 16 | September 9 | 85 | Craig |
| Meeker | 6,229 ft | June 4 | September 16 | 104 | Meeker |
| Meeker AP | 6,390 ft | May 30 | September 22 | 115 | Meeker |
| Mesa Verde Np | 7,142 ft | May 9 | October 14 | 158 | Cortez |
| Monte Vista 2W | 7,695 ft | June 11 | September 13 | 94 | Monte Vista |
| Montrose #2 | 5,789 ft | April 28 | October 14 | 169 | Montrose |
| Montrose 11 Ene | 8,402 ft | May 20 | October 1 | 134 | Montrose |
| Montrose Rgnl AP | 5,759 ft | May 2 | October 8 | 159 | Montrose |
| Monument | 7,080 ft | May 14 | October 1 | 140 | Monument |
| Monument 3S | 6,821 ft | May 17 | October 1 | 137 | Monument |
| New Raymer | 4,783 ft | May 9 | October 4 | 148 | Log Lane Village |
| New Raymer 21 N | 5,180 ft | May 18 | September 29 | 134 | |
| Northdale | 6,681 ft | June 3 | September 25 | 114 | Dove Creek |
| Northglenn | 5,407 ft | May 2 | October 11 | 162 | Northglenn |
| Norwood | 7,020 ft | May 25 | October 1 | 129 | Norwood |
| Norwood #2 | 7,011 ft | May 21 | October 1 | 133 | Norwood |
| Nunn 7 Nne | 5,390 ft | May 13 | September 27 | 137 | Pierce |
| Ordway 1 Ene | 4,312 ft | May 2 | October 8 | 159 | Ordway |
| Ordway 21 N | 4,767 ft | May 3 | October 7 | 157 | Ordway |
| Ouray | 7,840 ft | May 17 | October 1 | 137 | Ouray |
| Ouray #2 | 7,718 ft | May 18 | October 4 | 139 | Ouray |
| Palisade | 4,751 ft | April 17 | October 26 | 192 | Palisade |
| Paonia 1SW | 5,581 ft | May 3 | October 12 | 162 | Paonia |
| Paradox 2N | 5,447 ft | May 11 | October 5 | 147 | Nucla |
| Parker | 5,904 ft | May 9 | October 3 | 147 | Parker |
| Placerville | 7,383 ft | May 26 | September 29 | 126 | Mountain Village |
| Pueblo Mem AP | 4,720 ft | April 30 | October 9 | 162 | Blende |
| Pueblo Rsvr | 4,861 ft | April 26 | October 13 | 170 | Pueblo |
| Ralston Rsvr | 5,900 ft | May 3 | October 14 | 164 | Golden |
| Rangely 1E | 5,277 ft | May 15 | October 1 | 139 | Rangely |
| Ridgway | 7,049 ft | June 11 | September 13 | 94 | Ridgway |
| Rifle 3ENE | 5,469 ft | May 23 | September 25 | 125 | Rifle |
| Rifle Garfield CO AP | 5,530 ft | May 11 | October 4 | 146 | Rifle |
| Rio Grande Rsvr | 9,493 ft | June 15 | September 11 | 88 | Creede |
| Rocky Ford 2 Se | 4,170 ft | May 1 | October 8 | 160 | Rocky Ford |
| Roxborough SP | 6,117 ft | May 16 | October 1 | 138 | Roxborough Park |
| Rush 1N | 6,054 ft | May 9 | October 4 | 148 | Ellicott |
| Rustic 9WSW | 7,701 ft | June 5 | September 16 | 103 | Estes Park |
| Ruxton Park | 9,060 ft | June 3 | September 17 | 106 | Manitou Springs |
| Rye 1SW | 7,141 ft | May 5 | October 10 | 158 | Colorado City |
| Saguache | 7,701 ft | May 16 | September 28 | 135 | Saguache |
| Salida | 7,160 ft | May 29 | September 20 | 114 | Salida |
| San Luis 1 S | 7,943 ft | May 31 | September 23 | 115 | San Luis |
| Sedgwick 5 S | 3,996 ft | May 6 | October 7 | 154 | Julesburg |
| Seibert | 4,706 ft | May 4 | October 11 | 160 | Flagler |
| Shaw 4ENE | 5,000 ft | May 12 | October 4 | 145 | Flagler |
| Sheep Mtn | 7,744 ft | May 27 | September 25 | 121 | La Veta |
| Sheridan Lake | 4,070 ft | April 27 | October 15 | 171 | Cheyenne Wells |
| Sheridan Lake 4E | 4,039 ft | April 28 | October 13 | 168 | |
| Shoshone | 5,992 ft | May 1 | October 14 | 166 | Glenwood Springs |
| Springfield Comanche | 4,383 ft | May 3 | October 10 | 160 | Springfield |
| Steamboat Springs | 6,866 ft | June 9 | September 12 | 95 | Steamboat Springs |
| Sterling | 3,974 ft | April 30 | October 9 | 162 | Sterling |
| Stratton | 4,399 ft | May 6 | October 9 | 156 | Stratton |
| Strontia Springs Dam | 5,840 ft | May 16 | September 29 | 136 | Roxborough Park |
| Tacony 13 Se | 4,882 ft | May 5 | October 6 | 154 | Fowler |
| Taylor Park | 9,180 ft | June 20 | September 8 | 80 | Mount Crested Butte |
| Trinidad | 6,030 ft | April 30 | October 15 | 168 | Trinidad |
| Trinidad Lake | 6,310 ft | May 11 | October 4 | 146 | Trinidad |
| Trinidad Perry Stokes AP | 5,741 ft | May 4 | October 9 | 158 | Trinidad |
| Twin Lakes Rsvr | 9,236 ft | June 16 | September 10 | 86 | Leadville |
| Uravan | 5,021 ft | April 26 | October 18 | 175 | Nucla |
| Vail | 8,305 ft | June 21 | September 7 | 78 | Vail |
| Vallecito Dam | 7,644 ft | May 31 | September 26 | 118 | Bayfield |
| Vallecito Reservoir | 7,673 ft | May 18 | October 11 | 146 | Bayfield |
| Virginia Dale 7 Ene | 7,015 ft | May 31 | September 19 | 111 | Wellington |
| Walsenburg 1 Nw | 6,292 ft | May 6 | October 4 | 151 | Walsenburg |
| Walsh 1 W | 3,978 ft | April 30 | October 14 | 167 | Walsh |
| Waterdale | 5,230 ft | May 12 | October 1 | 142 | Loveland |
| Waverly 1W | 7,603 ft | June 6 | September 15 | 101 | Alamosa |
| Westcliffe | 7,873 ft | June 11 | September 9 | 90 | Westcliffe |
| WFO Pueblo | 4,653 ft | April 30 | October 9 | 162 | Blende |
| Wheat Ridge 2 | 5,398 ft | May 5 | October 5 | 153 | Wheat Ridge |
| Wild Horse 6N | 4,654 ft | May 4 | October 8 | 157 | Flagler |
| Williams Fork Dam | 7,618 ft | June 12 | September 10 | 90 | Hot Sulphur Springs |
| Woodrow 6NNE | 4,374 ft | May 15 | October 1 | 139 | Brush |
| Wray | 3,553 ft | May 7 | October 6 | 152 | Wray |
| Yampa | 7,857 ft | June 14 | September 11 | 89 | Oak Creek |
| Yellow Jacket 2W | 6,933 ft | May 17 | October 9 | 145 | Dolores |
| Yellow Jacket 4NE | 7,090 ft | May 15 | October 8 | 146 | Dolores |
| Yuma | 4,134 ft | May 1 | October 12 | 164 | Yuma |
Sources
NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal freeze probabilities. Public domain.