Utah frost dates
Across 169 weather stations in Utah, the median last spring frost runs from Mar 9 in Hite Ranger Station to Jun 21 in Brian Head, and the first fall frost from Sep 1 to Nov 20.
Utah at a glance
- Weather stations
- 169
- Earliest last frost
- Mar 9 Hite Ranger Station
- Latest last frost
- Jun 21 Brian Head
- Longest season
- 253 days Hite Ranger Station
- Typical season
- about 144 frost-free days
- Hardiness zones
- Zones 4a to 8b
Frost dates by weather station
| Weather station | Last spring frost | First fall frost | Frost-free days | Zone |
|---|---|---|---|---|
| Alpine | May 3 | Oct 12 | 159 | 7a |
| Alta | Jun 11 | Sep 18 | 98 | 6a |
| Altamont | May 31 | Sep 23 | 112 | 5b |
| Alton | Jun 1 | Sep 30 | 120 | 6a |
| Angle | Jun 17 | Sep 12 | 85 | 5b |
| Arches National Park Hqs | Apr 2 | Oct 30 | 207 | 7a |
| Bear Lake State Park | May 15 | Oct 4 | 140 | 5a |
| Beaver Canyon Power House | Jun 1 | Sep 28 | 120 | 6a |
| Big Water | Apr 8 | Nov 1 | 204 | 7b |
| Black Rock | May 23 | Sep 27 | 124 | 6a |
| Blanding | Apr 28 | Oct 21 | 174 | 7a |
| Blowhard Mountain Radar | Jun 7 | Sep 29 | 110 | 6a |
| Bluff | Apr 24 | Oct 13 | 172 | 7a |
| Boulder | May 4 | Oct 14 | 160 | 7a |
| Bountiful Bench | Apr 25 | Oct 24 | 181 | 6b |
| Bountiful-Val Verda | Apr 24 | Oct 19 | 178 | 7b |
| Brian Head | Jun 21 | Sep 12 | 82 | 6a |
| Brigham City | May 12 | Oct 5 | 144 | 6b |
| Brigham City Waste Plant | May 5 | Oct 5 | 150 | 6b |
| Bryce Canyon National Park Hqrs | May 23 | Sep 27 | 125 | 6a |
| Bullfrog Basin | Mar 25 | Nov 10 | 227 | 8a |
| Callao | May 14 | Sep 28 | 135 | 6b |
| Canyonlands-The Neck | Apr 25 | Oct 23 | 180 | 7a |
| Canyonlands-The Needles | Apr 30 | Oct 11 | 164 | 7a |
| Capitol Reef National Park | Apr 18 | Oct 28 | 192 | 6a |
| Castle Dale | May 18 | Sep 27 | 128 | 6a |
| Castle Valley | Apr 17 | Oct 23 | 185 | 7a |
| Castle Valley 1 mi SE | Apr 19 | Oct 21 | 184 | 7a |
| Cedar Breaks National Monument | Jun 11 | Oct 3 | 113 | 6a |
| Cedar City | May 4 | Oct 13 | 159 | 6b |
| Cedar City 5 mi E | May 23 | Oct 4 | 130 | 6b |
| Cedar City Municipal Airport | May 21 | Sep 29 | 130 | 6b |
| Cedar Point | May 16 | Oct 11 | 145 | 6b |
| Circleville | May 23 | Sep 27 | 125 | 5b |
| City Creek Water Plant | May 13 | Oct 7 | 146 | 6b |
| Coalville | Jun 7 | Sep 12 | 95 | 6a |
| Cottonwood Weir | Apr 29 | Oct 22 | 174 | 7b |
| Cutler Dam | May 3 | Oct 12 | 160 | 6a |
| Deer Creek Dam | May 28 | Sep 23 | 119 | 6b |
| Delta | May 16 | Sep 29 | 137 | 6a |
| Deseret | May 14 | Sep 30 | 137 | 6a |
| Dewey | Apr 27 | Oct 9 | 165 | 6b |
| Dinosaur Nm-Quarry Area | May 1 | Oct 6 | 156 | 5b |
| Draper-Point of Mountain | Apr 18 | Oct 22 | 185 | 7a |
| Duchesne | May 6 | Oct 5 | 150 | 6a |
| Dugway | May 11 | Oct 2 | 143 | 6b |
| Echo Dam | May 30 | Sep 18 | 112 | 6a |
| Eden-Liberty | May 25 | Sep 26 | 123 | 6a |
| Enterprise | May 21 | Oct 2 | 132 | 7a |
| Enterprise Beryl Junction | May 31 | Sep 20 | 110 | 5b |
| Ephraim | May 28 | Sep 20 | 113 | 6a |
| Escalante | May 8 | Oct 10 | 155 | 7a |
| Eskdale | May 12 | Oct 1 | 140 | 6b |
| Fairfield | Jun 2 | Sep 16 | 103 | 6a |
| Farmington | Apr 19 | Oct 19 | 181 | 7b |
| Ferron | May 6 | Oct 10 | 156 | 6a |
| Fillmore | May 4 | Oct 14 | 160 | 6a |
| Fish Springs Wildlife Refuge | Apr 26 | Oct 14 | 169 | 6b |
| Flaming Gorge | May 26 | Sep 23 | 120 | 5b |
| Fort Duchesne | May 19 | Oct 2 | 135 | 5b |
| Fremont Indian State Park | Jun 4 | Sep 21 | 106 | 6a |
| Garfield | Apr 3 | Nov 4 | 213 | 7b |
| Goblin Valley State Park | Apr 26 | Oct 18 | 173 | 7a |
| Granite Peak Dugway Pg | Apr 18 | Oct 16 | 179 | 6b |
| Grantsville | May 2 | Oct 14 | 164 | 7a |
| Grouse Creek | Jun 4 | Sep 17 | 104 | 6a |
| Hanksville | May 5 | Oct 3 | 149 | 7a |
| Hans Flat Ranger Station | May 1 | Oct 16 | 163 | 7a |
| Hatch | Jun 19 | Sep 13 | 83 | 6a |
| Heber | Jun 4 | Sep 20 | 106 | 6a |
| Hite Ranger Station | Mar 9 | Nov 20 | 253 | 8a |
| Hovenweep National Monument | May 2 | Oct 10 | 159 | 6b |
| Huntsville Monastery | Jun 4 | Sep 16 | 102 | 6a |
| Ibapah | Jun 14 | Sep 8 | 86 | 6b |
| Jarvie Ranch | May 19 | Sep 28 | 132 | 5b |
| Jensen | May 20 | Sep 25 | 126 | 5b |
| Johnson Pass | May 15 | Oct 5 | 142 | 6b |
| Kamas | Jun 5 | Sep 17 | 100 | 5b |
| Kanab | Apr 29 | Oct 22 | 175 | 7a |
| Kanosh | Apr 30 | Oct 19 | 172 | 6b |
| Kodachrome Basin Park | May 31 | Sep 28 | 116 | 6a |
| Koosharem | Jun 6 | Sep 21 | 104 | 5b |
| La Sal | May 17 | Oct 6 | 141 | 7a |
| La Verkin | Apr 1 | Nov 5 | 217 | 8a |
| Laketown | May 28 | Sep 24 | 119 | 5b |
| Levan | May 10 | Oct 7 | 148 | 6a |
| Little Sahara Rec Area | May 15 | Oct 1 | 137 | 6a |
| Loa | May 31 | Sep 21 | 112 | 6a |
| Logan Cache Airport | May 8 | Oct 2 | 144 | 6a |
| Logan Experiment Farm | May 12 | Sep 28 | 138 | 6a |
| Logan Radio Kvnu | May 8 | Oct 2 | 145 | 6a |
| Logan Utah State University | Apr 30 | Oct 16 | 166 | 6a |
| Lytle Ranch | Mar 18 | Nov 9 | 234 | 8a |
| Maeser | May 15 | Oct 5 | 143 | 5b |
| Manila | May 22 | Sep 29 | 128 | 5b |
| Manti | May 11 | Oct 6 | 146 | 6a |
| Manti Radio Kmti | May 31 | Sep 21 | 114 | 6a |
| Marysvale | May 24 | Sep 25 | 123 | 6a |
| Mexican Hat | Apr 11 | Oct 30 | 201 | 7b |
| Milford | May 10 | Oct 2 | 144 | 6a |
| Milford Municipal Airport | May 13 | Oct 4 | 143 | 6a |
| Moab | Apr 11 | Oct 23 | 192 | 7a |
| Moab Canyonland Airport | Apr 22 | Oct 20 | 179 | 6b |
| Modena | May 20 | Oct 3 | 136 | 5b |
| Monticello 2 mi E | May 19 | Oct 2 | 133 | 6b |
| Monticello No. 2 | May 17 | Oct 7 | 141 | 6b |
| Moon Lake | Jun 11 | Sep 18 | 97 | 5a |
| Morgan | May 25 | Sep 24 | 119 | 6a |
| Moroni | May 26 | Sep 25 | 119 | 5b |
| Mountain Dell Dam | May 7 | Oct 14 | 158 | 6b |
| Myton | May 7 | Oct 5 | 149 | 5b |
| Natural Bridges National Monument | May 5 | Oct 13 | 157 | 7a |
| Neola | May 19 | Sep 29 | 130 | 6a |
| Nephi | May 6 | Oct 10 | 156 | 6a |
| New Harmony | May 9 | Oct 11 | 155 | 7a |
| Oak City | May 2 | Oct 13 | 162 | 6b |
| Ogden Hinkley Airport | Apr 22 | Oct 22 | 180 | 7a |
| Ogden NE Bench | Apr 19 | Oct 22 | 186 | 6b |
| Ogden Pioneer Powerhouse | Apr 21 | Oct 23 | 184 | 6b |
| Ogden Sugar Factory | Apr 22 | Oct 18 | 177 | 7a |
| Orderville | May 15 | Oct 8 | 144 | 6b |
| Orem Treatment Plant | Apr 19 | Oct 19 | 182 | 7a |
| Ouray | May 2 | Oct 3 | 152 | 5b |
| Panguitch | Jun 12 | Sep 12 | 90 | 6a |
| Paria Ranger Station | Apr 19 | Oct 23 | 186 | 7a |
| Park City | May 29 | Sep 25 | 117 | 6a |
| Partoun | May 13 | Sep 29 | 137 | 6a |
| Pineview Dam | May 22 | Sep 26 | 125 | 6b |
| Pleasant Grove | Apr 17 | Oct 25 | 188 | 7a |
| Price Carbon County Airport | May 3 | Oct 12 | 160 | 6a |
| Provo BYU | Apr 18 | Oct 21 | 185 | 7a |
| Randolph | Jun 14 | Sep 1 | 76 | 4a |
| Richfield Radio Ksvc | May 21 | Sep 24 | 125 | 6a |
| Richmond | May 11 | Oct 5 | 143 | 6a |
| Roosevelt Radio | May 23 | Sep 22 | 121 | 5b |
| Rosette | May 21 | Oct 2 | 132 | 6a |
| Salina | May 29 | Sep 26 | 118 | 6b |
| Salt Lake City E Bench | Apr 25 | Oct 18 | 175 | 7a |
| Salt Lake City International Airport | Apr 8 | Oct 31 | 204 | 7b |
| Salt Lake Triad Center | Mar 31 | Nov 8 | 224 | 7b |
| Santaquin Chlorinator | May 4 | Oct 11 | 157 | 6b |
| Scipio | May 22 | Sep 25 | 122 | 5b |
| Scofield Dam | Jun 15 | Sep 12 | 87 | 6a |
| Scofield-Skyline Mine | Jun 13 | Sep 17 | 94 | 6a |
| Snake Creek Powerhouse | May 31 | Sep 11 | 101 | 6a |
| Spanish Fork Power House | Apr 25 | Oct 18 | 174 | 7a |
| St. George | Mar 14 | Nov 10 | 239 | 8b |
| Sundance | May 17 | Oct 5 | 138 | 6b |
| Sunnyside City | Apr 26 | Oct 25 | 181 | 6b |
| Sunnyside City Center | May 5 | Oct 15 | 159 | 6b |
| Thiokol Propulsion F | May 17 | Sep 24 | 128 | 6a |
| Timpanogos Cave | May 2 | Oct 16 | 161 | 6a |
| Tooele | May 2 | Oct 16 | 165 | 7a |
| Torrey | Apr 22 | Oct 23 | 183 | 6a |
| Tremonton | Apr 24 | Oct 17 | 175 | 6b |
| Trenton | May 17 | Sep 18 | 121 | 5b |
| Utah Lake Lehi | Apr 30 | Oct 9 | 159 | 7a |
| Utah Test Range | May 15 | Oct 2 | 139 | 7a |
| Valley of the Gods | Mar 29 | Nov 6 | 223 | 7b |
| Vernal | May 7 | Oct 6 | 150 | 5b |
| Vernal Municipal Airport | May 6 | Oct 7 | 153 | 5b |
| Vernon | Jun 1 | Sep 20 | 110 | 6b |
| Veyo Powerhouse | Apr 9 | Nov 5 | 207 | 7b |
| Wah Wah Ranch | May 19 | Sep 29 | 131 | 6a |
| Wanship Dam | Jun 11 | Sep 12 | 92 | 5b |
| Weber Basin Pump Plant | Apr 29 | Oct 20 | 172 | 7a |
| Wellington | May 27 | Sep 26 | 122 | 6a |
| Wendover Airport | Apr 18 | Oct 23 | 188 | 6b |
| Zion National Park | Apr 13 | Nov 2 | 202 | 6b |
Median dates from NOAA 1991–2020 climate normals. How to read them.