Frost dates by state
Colorado Frost Dates
Across Colorado's 272 cities and towns, the average last spring frost runs from April 14 in Grand Junction to June 21 in Ward. Average last frost elsewhere: Denver May 4, Colorado Springs May 3 and Fort Collins May 3. In 25 towns, frost is possible in any month.
Frost dates for every city and town in Colorado
Dates are for 32°F at the NOAA station nearest the ZIP code at each Colorado town's center. "Safer date" is when only 1 year in 10 still gets a frost, a good target for tomatoes and peppers.
| City | Average last frost | Safer date | Average first frost | Frost-free days |
|---|---|---|---|---|
| Aguilar | May 11 | May 25 | Oct 4 | 146 |
| Akron | May 6 | May 19 | Oct 8 | 155 |
| Alamosa | May 30 | Jun 13 | Sep 17 | 110 |
| Alma | Frost possible any month | |||
| Antonito | May 28 | Jun 11 | Sep 21 | 116 |
| Arriba | May 5 | May 20 | Oct 8 | 156 |
| Arvada | May 5 | May 18 | Oct 5 | 153 |
| Aspen | Jun 2 | Jun 17 | Sep 23 | 113 |
| Ault | May 3 | May 15 | Oct 6 | 156 |
| Aurora | May 7 | May 21 | Oct 8 | 154 |
| Avon | Jun 21 | Jul 9 | Sep 7 | 78 |
| Basalt | May 31 | Jun 14 | Sep 23 | 115 |
| Bayfield | May 31 | Jun 14 | Sep 26 | 118 |
| Bennett | May 5 | May 19 | Oct 9 | 157 |
| Berthoud | May 10 | May 22 | Oct 1 | 144 |
| Bethune | May 6 | May 17 | Oct 9 | 156 |
| Black Hawk | Jun 5 | Jun 19 | Sep 16 | 103 |
| Blanca | May 25 | Jun 12 | Sep 22 | 120 |
| Blue River | Frost possible any month | |||
| Bonanza | May 16 | May 31 | Sep 28 | 135 |
| Boone | Apr 30 | May 12 | Oct 9 | 162 |
| Boulder | May 6 | May 18 | Oct 5 | 152 |
| Bow Mar | May 2 | May 17 | Oct 11 | 162 |
| Branson | Apr 24 | May 6 | Oct 18 | 177 |
| Breckenridge | Frost possible any month | |||
| Brighton | May 3 | May 16 | Oct 7 | 157 |
| Brookside | May 4 | May 18 | Oct 7 | 156 |
| Broomfield | May 2 | May 14 | Oct 11 | 162 |
| Brush | May 15 | May 28 | Oct 1 | 139 |
| Buena Vista | May 27 | Jun 11 | Sep 23 | 119 |
| Burlington | May 6 | May 19 | Oct 9 | 156 |
| Calhan | May 9 | May 22 | Oct 4 | 148 |
| Campo | Apr 29 | May 12 | Oct 13 | 167 |
| Canon City | May 4 | May 18 | Oct 7 | 156 |
| Carbonate | May 1 | May 14 | Oct 14 | 166 |
| Carbondale | May 31 | Jun 14 | Sep 23 | 115 |
| Castle Pines | May 9 | May 24 | Oct 2 | 146 |
| Castle Rock | May 9 | May 24 | Oct 2 | 146 |
| Cedaredge | May 3 | May 21 | Oct 9 | 159 |
| Centennial | May 5 | May 17 | Oct 8 | 156 |
| Center | May 24 | Jun 8 | Sep 24 | 123 |
| Central | Jun 5 | Jun 19 | Sep 16 | 103 |
| Cheraw | Apr 30 | May 13 | Oct 10 | 163 |
| Cherry Hills Village | May 2 | May 17 | Oct 11 | 162 |
| Cheyenne Wells | May 1 | May 17 | Oct 14 | 166 |
| City of Creede | Frost possible any month | |||
| Coal Creek | May 4 | May 18 | Oct 7 | 156 |
| Cokedale | Apr 30 | May 11 | Oct 15 | 168 |
| Collbran | Frost possible any month | |||
| Colorado Springs | May 3 | May 15 | Oct 8 | 158 |
| Columbine Valley | May 2 | May 17 | Oct 11 | 162 |
| Commerce City | May 3 | May 16 | Oct 7 | 157 |
| Cortez | May 27 | Jun 11 | Sep 28 | 124 |
| Craig | May 29 | Jun 13 | Sep 20 | 114 |
| Crawford | May 23 | Jun 9 | Oct 1 | 131 |
| Crested Butte | Frost possible any month | |||
| Crestone | May 26 | Jun 9 | Sep 26 | 123 |
| Cripple Creek | May 26 | Jun 9 | Sep 26 | 123 |
| Crook | May 11 | May 23 | Oct 4 | 146 |
| Crowley | May 2 | May 14 | Oct 8 | 159 |
| Dacono | May 7 | May 22 | Oct 5 | 151 |
| De Beque | May 11 | May 27 | Oct 4 | 146 |
| Deer Trail | May 13 | May 30 | Oct 2 | 142 |
| Del Norte | May 23 | Jun 8 | Sep 25 | 125 |
| Delta | May 1 | May 14 | Oct 7 | 159 |
| Denver | May 4 | May 16 | Oct 8 | 157 |
| Dillon | Frost possible any month | |||
| Dinosaur | May 10 | May 27 | Oct 4 | 147 |
| Dolores | May 15 | May 31 | Oct 8 | 146 |
| Dove Creek | May 11 | May 25 | Oct 12 | 154 |
| Durango | Jun 1 | Jun 15 | Sep 27 | 118 |
| Eads | Apr 30 | May 12 | Oct 13 | 166 |
| Eagle | Frost possible any month | |||
| Eaton | May 2 | May 14 | Oct 8 | 159 |
| Eckley | May 1 | May 13 | Oct 12 | 164 |
| Edgewater | May 3 | May 18 | Oct 7 | 157 |
| Elizabeth | May 16 | Jun 1 | Oct 2 | 139 |
| Empire | May 30 | Jun 14 | Sep 19 | 112 |
| Englewood | May 2 | May 17 | Oct 11 | 162 |
| Erie | May 7 | May 22 | Oct 5 | 151 |
| Estes Park | May 30 | Jun 14 | Sep 17 | 110 |
| Evans | May 2 | May 14 | Oct 8 | 159 |
| Fairplay | Jun 16 | Jun 30 | Sep 9 | 85 |
| Federal Heights | May 2 | May 14 | Oct 11 | 162 |
| Firestone | May 7 | May 22 | Oct 5 | 151 |
| Flagler | May 5 | May 20 | Oct 8 | 156 |
| Fleming | May 4 | May 16 | Oct 11 | 160 |
| Florence | May 4 | May 18 | Oct 7 | 156 |
| Fort Collins | May 3 | May 15 | Oct 6 | 156 |
| Fort Lupton | May 3 | May 16 | Oct 7 | 157 |
| Fort Morgan | May 6 | May 19 | Oct 6 | 153 |
| Fountain | May 3 | May 15 | Oct 8 | 158 |
| Fowler | May 1 | May 14 | Oct 8 | 160 |
| Foxfield | May 7 | May 21 | Oct 8 | 154 |
| Fraser | Frost possible any month | |||
| Frederick | May 7 | May 22 | Oct 5 | 151 |
| Frisco | Frost possible any month | |||
| Fruita | Apr 27 | May 7 | Oct 11 | 167 |
| Garden City | May 2 | May 14 | Oct 8 | 159 |
| Genoa | May 8 | May 22 | Oct 10 | 155 |
| Georgetown | May 30 | Jun 14 | Sep 19 | 112 |
| Gilcrest | May 2 | May 14 | Oct 8 | 159 |
| Glendale | Apr 30 | May 13 | Oct 12 | 165 |
| Glenwood Springs | May 1 | May 14 | Oct 14 | 166 |
| Golden | May 3 | May 18 | Oct 7 | 157 |
| Granada | May 1 | May 14 | Oct 12 | 164 |
| Granby | Frost possible any month | |||
| Grand Junction | Apr 14 | Apr 28 | Oct 23 | 192 |
| Grand Lake | Frost possible any month | |||
| Greeley | May 2 | May 14 | Oct 8 | 159 |
| Green Mountain Falls | Jun 3 | Jun 23 | Sep 17 | 106 |
| Greenwood Village | May 7 | May 21 | Oct 8 | 154 |
| Grover | May 14 | May 27 | Sep 26 | 135 |
| Gunnison | Frost possible any month | |||
| Gypsum | Frost possible any month | |||
| Hartman | May 1 | May 14 | Oct 12 | 164 |
| Haswell | Apr 30 | May 12 | Oct 13 | 166 |
| Haxtun | May 11 | May 23 | Oct 3 | 145 |
| Hayden | Jun 1 | Jun 16 | Sep 20 | 111 |
| Hillrose | May 6 | May 19 | Oct 8 | 155 |
| Holly | May 1 | May 14 | Oct 12 | 164 |
| Holyoke | May 11 | May 23 | Oct 3 | 145 |
| Hooper | May 21 | Jun 3 | Oct 1 | 133 |
| Hot Sulphur Springs | Jun 12 | Jun 25 | Sep 10 | 90 |
| Hotchkiss | May 3 | May 18 | Oct 12 | 162 |
| Hudson | May 3 | May 16 | Oct 7 | 157 |
| Hugo | May 10 | May 25 | Oct 2 | 145 |
| Idaho Springs | Jun 5 | Jun 19 | Sep 16 | 103 |
| Ignacio | May 23 | Jun 7 | Sep 29 | 129 |
| Iliff | May 11 | May 23 | Oct 4 | 146 |
| Jamestown | Jun 21 | Jul 4 | Sep 2 | 73 |
| Johnstown | May 10 | May 22 | Oct 1 | 144 |
| Julesburg | May 7 | May 18 | Oct 6 | 152 |
| Keenesburg | May 5 | May 19 | Oct 9 | 157 |
| Kersey | May 2 | May 14 | Oct 8 | 159 |
| Kim | May 5 | May 19 | Oct 9 | 157 |
| Kiowa | May 16 | Jun 1 | Oct 2 | 139 |
| Kit Carson | May 10 | May 24 | Oct 1 | 144 |
| Kremmling | Jun 14 | Jun 30 | Sep 5 | 83 |
| La Jara | May 28 | Jun 11 | Sep 21 | 116 |
| La Junta | Apr 26 | May 9 | Oct 15 | 172 |
| La Salle | May 2 | May 14 | Oct 8 | 159 |
| La Veta | May 27 | Jun 10 | Sep 25 | 121 |
| Lafayette | May 6 | May 18 | Oct 5 | 152 |
| Lake City | Jun 8 | Jun 24 | Sep 17 | 101 |
| Lakeside | Apr 30 | May 13 | Oct 12 | 165 |
| Lakewood | May 3 | May 18 | Oct 7 | 157 |
| Lamar | May 2 | May 17 | Oct 7 | 158 |
| Larkspur | May 14 | May 31 | Oct 1 | 140 |
| Las Animas | Apr 29 | May 11 | Oct 12 | 166 |
| Leadville | Frost possible any month | |||
| Limon | May 21 | Jun 4 | Sep 26 | 128 |
| Littleton | May 2 | May 17 | Oct 11 | 162 |
| Lochbuie | May 3 | May 16 | Oct 7 | 157 |
| Log Lane Village | May 6 | May 19 | Oct 6 | 153 |
| Lone Tree | May 5 | May 17 | Oct 8 | 156 |
| Longmont | May 7 | May 22 | Oct 5 | 151 |
| Louisville | May 6 | May 18 | Oct 5 | 152 |
| Loveland | May 10 | May 22 | Oct 1 | 144 |
| Lyons | May 7 | May 22 | Oct 5 | 151 |
| Manassa | May 28 | Jun 11 | Sep 21 | 116 |
| Mancos | Jun 4 | Jun 19 | Sep 24 | 112 |
| Manitou Springs | Jun 3 | Jun 23 | Sep 17 | 106 |
| Manzanola | May 1 | May 14 | Oct 8 | 160 |
| Marble | May 31 | Jun 14 | Sep 23 | 115 |
| Mead | May 7 | May 22 | Oct 5 | 151 |
| Meeker | May 30 | Jun 13 | Sep 22 | 115 |
| Merino | Apr 30 | May 12 | Oct 9 | 162 |
| Milliken | May 2 | May 14 | Oct 8 | 159 |
| Minturn | Jun 21 | Jul 9 | Sep 7 | 78 |
| Moffat | May 26 | Jun 9 | Sep 26 | 123 |
| Monte Vista | Jun 11 | Jun 25 | Sep 13 | 94 |
| Montezuma | Frost possible any month | |||
| Montrose | Apr 28 | May 12 | Oct 14 | 169 |
| Monument | May 14 | May 31 | Oct 1 | 140 |
| Morrison | May 23 | Jun 10 | Sep 22 | 122 |
| Mount Crested Butte | Frost possible any month | |||
| Mountain View | Apr 30 | May 13 | Oct 12 | 165 |
| Mountain Village | Frost possible any month | |||
| Naturita | May 25 | Jun 13 | Oct 1 | 129 |
| Nederland | Jun 21 | Jul 4 | Sep 2 | 73 |
| New Castle | May 23 | Jun 6 | Sep 25 | 125 |
| Northglenn | May 2 | May 14 | Oct 11 | 162 |
| Norwood | May 25 | Jun 13 | Oct 1 | 129 |
| Nucla | May 25 | Jun 13 | Oct 1 | 129 |
| Nunn | May 13 | May 27 | Sep 27 | 137 |
| Oak Creek | Jun 14 | Jun 28 | Sep 11 | 89 |
| Olathe | May 1 | May 14 | Oct 7 | 159 |
| Olney Springs | May 2 | May 14 | Oct 8 | 159 |
| Ophir | Frost possible any month | |||
| Orchard City | May 1 | May 14 | Oct 7 | 159 |
| Ordway | May 2 | May 14 | Oct 8 | 159 |
| Otis | May 8 | May 22 | Oct 6 | 151 |
| Ouray | May 17 | Jun 3 | Oct 1 | 137 |
| Ovid | May 6 | May 18 | Oct 7 | 154 |
| Pagosa Springs | Jun 9 | Jun 27 | Sep 22 | 105 |
| Palisade | Apr 17 | May 3 | Oct 26 | 192 |
| Palmer Lake | May 14 | May 31 | Oct 1 | 140 |
| Paoli | May 11 | May 23 | Oct 3 | 145 |
| Paonia | May 3 | May 18 | Oct 12 | 162 |
| Parachute | May 11 | May 27 | Oct 4 | 146 |
| Parker | May 9 | May 23 | Oct 3 | 147 |
| Peetz | May 15 | May 30 | Sep 30 | 138 |
| Pierce | May 3 | May 15 | Oct 6 | 156 |
| Pitkin | Jun 20 | Jul 2 | Sep 8 | 80 |
| Platteville | May 2 | May 14 | Oct 8 | 159 |
| Poncha Springs | May 29 | Jun 12 | Sep 20 | 114 |
| Pritchett | May 3 | May 17 | Oct 10 | 160 |
| Pueblo | Apr 26 | May 8 | Oct 13 | 170 |
| Ramah | May 12 | May 26 | Oct 2 | 143 |
| Rangely | May 15 | Jun 2 | Oct 1 | 139 |
| Raymer (New Raymer) | May 9 | May 22 | Oct 4 | 148 |
| Red Cliff | Jun 21 | Jul 9 | Sep 7 | 78 |
| Rico | Frost possible any month | |||
| Ridgway | Jun 11 | Jun 30 | Sep 13 | 94 |
| Rifle | May 11 | May 27 | Oct 4 | 146 |
| Rockvale | May 4 | May 18 | Oct 7 | 156 |
| Rocky Ford | May 1 | May 14 | Oct 8 | 160 |
| Romeo | May 28 | Jun 11 | Sep 21 | 116 |
| Rye | May 5 | May 20 | Oct 10 | 158 |
| Saguache | May 16 | May 31 | Sep 28 | 135 |
| Salida | May 29 | Jun 12 | Sep 20 | 114 |
| San Luis | May 31 | Jun 14 | Sep 23 | 115 |
| Sanford | May 28 | Jun 11 | Sep 21 | 116 |
| Sawpit | May 26 | Jun 6 | Sep 29 | 126 |
| Sedgwick | May 6 | May 18 | Oct 7 | 154 |
| Seibert | May 4 | May 17 | Oct 11 | 160 |
| Severance | May 3 | May 15 | Oct 6 | 156 |
| Sheridan | May 2 | May 17 | Oct 11 | 162 |
| Sheridan Lake | Apr 27 | May 10 | Oct 15 | 171 |
| Silt | May 11 | May 27 | Oct 4 | 146 |
| Silver Cliff | Jun 11 | Jun 28 | Sep 9 | 90 |
| Silver Plume | May 30 | Jun 14 | Sep 19 | 112 |
| Silverthorne | Frost possible any month | |||
| Silverton | Frost possible any month | |||
| Simla | May 12 | May 26 | Oct 2 | 143 |
| Snowmass Village | May 31 | Jun 14 | Sep 23 | 115 |
| South Fork | May 23 | Jun 8 | Sep 25 | 125 |
| Springfield | May 3 | May 17 | Oct 10 | 160 |
| Starkville | Apr 30 | May 11 | Oct 15 | 168 |
| Steamboat Springs | Jun 9 | Jun 24 | Sep 12 | 95 |
| Sterling | Apr 30 | May 12 | Oct 9 | 162 |
| Stratton | May 6 | May 17 | Oct 9 | 156 |
| Sugar City | May 2 | May 14 | Oct 8 | 159 |
| Superior | May 6 | May 18 | Oct 5 | 152 |
| Swink | May 1 | May 14 | Oct 8 | 160 |
| Telluride | Frost possible any month | |||
| Thornton | May 2 | May 14 | Oct 11 | 162 |
| Timnath | May 3 | May 15 | Oct 6 | 156 |
| Trinidad | Apr 30 | May 11 | Oct 15 | 168 |
| Two Buttes | Apr 30 | May 12 | Oct 14 | 167 |
| Vail | Jun 21 | Jul 9 | Sep 7 | 78 |
| Victor | May 26 | Jun 9 | Sep 26 | 123 |
| Vilas | Apr 30 | May 12 | Oct 14 | 167 |
| Vona | May 6 | May 17 | Oct 9 | 156 |
| Walden | Frost possible any month | |||
| Walsenburg | May 6 | May 20 | Oct 4 | 151 |
| Walsh | Apr 30 | May 12 | Oct 14 | 167 |
| Ward | Jun 21 | Jul 4 | Sep 2 | 73 |
| Wellington | May 3 | May 15 | Oct 6 | 156 |
| Westcliffe | Jun 11 | Jun 28 | Sep 9 | 90 |
| Westminster | May 2 | May 14 | Oct 11 | 162 |
| Wheat Ridge | May 5 | May 18 | Oct 5 | 153 |
| Wiggins | May 6 | May 19 | Oct 6 | 153 |
| Wiley | May 2 | May 17 | Oct 7 | 158 |
| Williamsburg | May 4 | May 18 | Oct 7 | 156 |
| Windsor | May 3 | May 15 | Oct 6 | 156 |
| Winter Park | Frost possible any month | |||
| Woodland Park | Jun 1 | Jun 17 | Sep 21 | 112 |
| Wray | May 7 | May 19 | Oct 6 | 152 |
| Yampa | Jun 14 | Jun 28 | Sep 11 | 89 |
| Yuma | May 1 | May 13 | Oct 12 | 164 |
Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020. City centers from the US Census Bureau. Click a city for its nearest station and, where it has frost dates, hard-freeze dates and a vegetable planting calendar. See how we calculate.
Frequently asked questions
When is the last frost in Denver, CO?
The average last spring frost in Denver is May 4, and only 1 year in 10 has a frost after May 16. The average first fall frost is October 8. These come from NOAA's 1991–2020 records at the Denver-Stapleton station.
When should I plant tomatoes in Colorado?
UNH Extension times tomato transplants for 1 to 2 weeks after the average last frost. In Denver that's about May 11 to May 18. Look up your ZIP code for your own dates and a full vegetable planting calendar.
More for Colorado: Colorado climate zones (insulation) · Colorado planting zones · Frost line depth by state