Utah frost dates: Last spring and first autumn frost at every NOAA station, 1991-2020
Across Utah's 169 NOAA stations with frost dates, the median last spring frost (32°F) runs from March 9 in Hite Ranger Station to June 21 in Brian Head; for half of its places it comes after May 14.
- Typical last spring frost
- May 14median of 96 places
- Typical first autumn frost
- October 5median of 96 places
- Earliest last frost
- March 9Hite Ranger Station
- Latest last frost
- June 21Brian Head
When is the last frost in Utah, town by town?
Each date is NOAA's: "after May 14 in half of years" means the last 32°F night of spring came after May 14 in half of the years 1991-2020. By the 1-in-10 date, the last frost has passed in nine years out of ten.
Find your town in the list, or look up a ZIP code for the stations nearest it.
| Place or station | Last frost (median) | 1 in 10 after | First frost (median) | 1 in 10 before | Growing season | Zone |
|---|---|---|---|---|---|---|
| Hite Ranger Station | March 9 | April 5 | November 20 | November 4 | 253 days | – |
| St. GeorgeSt George | March 14 | April 6 | November 10 | October 27 | 239 days | 8b |
| Lytle Ranch | March 18 | April 16 | November 9 | October 22 | 234 days | – |
| Bullfrog Basin | March 25 | April 12 | November 10 | October 26 | 227 days | 8a |
| Valley Of The Gods | March 29 | April 15 | November 6 | October 23 | 223 days | – |
| Salt Lake Triad Center | March 31 | April 19 | November 8 | October 23 | 224 days | – |
| La Verkin | April 1 | April 24 | November 5 | October 23 | 217 days | 8a |
| Arches National Park Headquarters | April 2 | April 23 | October 30 | October 12 | 207 days | 7b |
| Garfield | April 3 | April 19 | November 4 | October 18 | 213 days | 8a |
| Big Water | April 8 | April 28 | November 1 | October 18 | 204 days | – |
| Salt Lake CitySalt Lake City International Airport | April 8 | April 30 | October 31 | October 17 | 204 days | 7a |
| VeyoVeyo Powerhouse | April 9 | April 28 | November 5 | October 21 | 207 days | 8a |
| Mexican Hat | April 11 | April 26 | October 30 | October 17 | 201 days | 7b |
| Moab | April 11 | April 28 | October 23 | October 8 | 192 days | 7b |
| Zion National Park | April 13 | May 2 | November 2 | October 20 | 202 days | 8a |
| Castle Valley station | April 17 | May 3 | October 23 | October 9 | 185 days | – |
| Pleasant Grove | April 17 | May 7 | October 25 | October 10 | 188 days | 7b |
| Capitol Reef National Park | April 18 | May 3 | October 28 | October 14 | 192 days | 7b |
| DraperDraper-Point Of Mountain | April 18 | May 6 | October 22 | October 7 | 185 days | – |
| Granite Peak Dugway Proving Ground | April 18 | May 5 | October 16 | October 2 | 179 days | – |
| ProvoProvo BYU | April 18 | May 5 | October 21 | October 7 | 185 days | 7b |
| WendoverWendover Airport Awos | April 18 | May 5 | October 23 | October 13 | 188 days | 7a |
| Castle Valley1 mi SE | April 19 | May 3 | October 21 | October 8 | 184 days | – |
| Farmington3 mi NW | April 19 | May 7 | October 19 | October 6 | 181 days | – |
| Ogden NE Bench | April 19 | May 4 | October 22 | October 7 | 186 days | – |
| OremOrem Trtmt Plant | April 19 | May 9 | October 19 | October 5 | 182 days | 7a |
| Paria Ranger Station | April 19 | May 9 | October 23 | October 9 | 186 days | – |
| Ogden Pioneer Powerhouse | April 21 | May 6 | October 23 | October 8 | 184 days | – |
| Moab Canyonland Airport | April 22 | May 8 | October 20 | October 6 | 179 days | 6b |
| OgdenOgden Hinkley Airport | April 22 | May 10 | October 22 | October 7 | 180 days | 7a |
| Ogden Sugar Factory | April 22 | May 9 | October 18 | October 1 | 177 days | – |
| Torrey7 mi E | April 22 | May 9 | October 23 | October 9 | 183 days | – |
| Bluff | April 24 | May 9 | October 13 | October 1 | 172 days | 7a |
| North Salt LakeBountiful-Val Verda | April 24 | May 14 | October 19 | October 5 | 178 days | 7b |
| Tremonton | April 24 | May 9 | October 17 | October 3 | 175 days | – |
| BountifulBountiful Bench | April 25 | May 14 | October 24 | October 9 | 181 days | 7a |
| Canyonlands-The Neck | April 25 | May 13 | October 23 | October 6 | 180 days | 7b |
| Salt Lake City E Bench | April 25 | May 10 | October 18 | October 5 | 175 days | – |
| Spanish Fork Power House | April 25 | May 13 | October 18 | October 4 | 174 days | 7a |
| Fish Springs National Wildlife Refuge | April 26 | May 17 | October 14 | October 1 | 169 days | – |
| Goblin Valley State Park | April 26 | May 10 | October 18 | October 2 | 173 days | – |
| Sunnyside City | April 26 | May 18 | October 25 | October 7 | 181 days | – |
| Dewey | April 27 | May 9 | October 9 | September 28 | 165 days | – |
| Blanding | April 28 | May 16 | October 21 | October 6 | 174 days | 7a |
| Cottonwood HeightsCottonwood Weir | April 29 | May 30 | October 22 | October 6 | 174 days | 7a |
| Kanab | April 29 | May 18 | October 22 | October 6 | 175 days | 7a |
| Weber Basin Pump Plant 3 | April 29 | May 25 | October 20 | October 1 | 172 days | – |
| Canyonlands-The Needles | April 30 | May 16 | October 11 | September 27 | 164 days | 7a |
| Kanosh | April 30 | May 21 | October 19 | October 3 | 172 days | – |
| Logan Utah St University | April 30 | May 19 | October 16 | October 1 | 166 days | 6b |
| Saratoga SpringsUtah Lake Lehi | April 30 | May 27 | October 9 | September 26 | 159 days | 7a |
| Dinosaur National Monument-Quarry Area | May 1 | May 23 | October 6 | September 25 | 156 days | 5b |
| Hans Flat Ranger Station | May 1 | May 24 | October 16 | October 2 | 163 days | 7b |
| Grantsville2 mi W | May 2 | May 19 | October 14 | September 30 | 164 days | 7a |
| Hovenweep National Monument | May 2 | May 21 | October 10 | September 27 | 159 days | 7a |
| Oak City | May 2 | May 21 | October 13 | September 30 | 162 days | 6b |
| Ouray (4 mi NE) | May 2 | May 16 | October 3 | September 21 | 152 days | 5a |
| Timpanogos Cave | May 2 | May 26 | October 16 | October 1 | 161 days | – |
| Tooele | May 2 | May 28 | October 16 | October 2 | 165 days | 7a |
| Alpine | May 3 | May 26 | October 12 | September 29 | 159 days | 7a |
| Cutler Dam | May 3 | May 24 | October 12 | September 27 | 160 days | 6b |
| PricePrice Carbon County Airport | May 3 | May 21 | October 12 | September 29 | 160 days | 6b |
| Boulder | May 4 | May 25 | October 14 | September 30 | 160 days | 7a |
| Cedar City station | May 4 | May 28 | October 13 | September 30 | 159 days | – |
| Fillmore | May 4 | May 26 | October 14 | September 30 | 160 days | 7a |
| SantaquinSantaquin Chlorinator | May 4 | May 28 | October 11 | September 27 | 157 days | 6b |
| Brigham CityBrigham City Waste Plant | May 5 | May 29 | October 5 | September 20 | 150 days | 6b |
| Hanksville | May 5 | May 23 | October 3 | September 21 | 149 days | 6b |
| Natural Bridges National Monument | May 5 | May 27 | October 13 | September 29 | 157 days | 7a |
| Sunnyside City Center | May 5 | May 26 | October 15 | September 30 | 159 days | 7a |
| Duchesne | May 6 | May 26 | October 5 | September 24 | 150 days | 6a |
| Ferron | May 6 | May 27 | October 10 | September 28 | 156 days | 6b |
| Nephi | May 6 | May 24 | October 10 | September 28 | 156 days | 6b |
| VernalVernal Municipal Airport | May 6 | May 25 | October 7 | September 25 | 153 days | 6a |
| Mountain Dell Dam | May 7 | May 27 | October 14 | September 29 | 158 days | 6b |
| Myton | May 7 | May 25 | October 5 | September 22 | 149 days | – |
| Vernal station | May 7 | May 28 | October 6 | September 23 | 150 days | 6a |
| Escalante | May 8 | May 24 | October 10 | September 26 | 155 days | 7a |
| LoganLogan Cache Airport | May 8 | May 29 | October 2 | September 19 | 144 days | 5b |
| Logan Radio KVNU | May 8 | June 2 | October 2 | September 18 | 145 days | 6a |
| New Harmony | May 9 | May 29 | October 11 | September 27 | 155 days | 7a |
| Levan | May 10 | May 31 | October 7 | September 24 | 148 days | 6a |
| Milford station | May 10 | June 1 | October 2 | September 20 | 144 days | – |
| Dugway | May 11 | May 29 | October 2 | September 19 | 143 days | 6a |
| Manti | May 11 | June 1 | October 6 | September 24 | 146 days | 6b |
| Richmond | May 11 | June 2 | October 5 | September 21 | 143 days | 6a |
| Brigham City (28 mi WNW) | May 12 | June 8 | October 5 | September 24 | 144 days | – |
| Eskdale | May 12 | June 3 | October 1 | September 19 | 140 days | 5b |
| Logan 5 SW Experiment Farm | May 12 | May 29 | September 28 | September 14 | 138 days | 5b |
| City Creek Water Treatment Plant | May 13 | May 31 | October 7 | September 26 | 146 days | 6b |
| MilfordMilford Municipal Airport | May 13 | June 2 | October 4 | September 22 | 143 days | 5b |
| Partoun | May 13 | June 5 | September 29 | September 16 | 137 days | 6a |
| Callao | May 14 | June 4 | September 28 | September 14 | 135 days | 6b |
| Deseret | May 14 | May 31 | September 30 | September 16 | 137 days | 6a |
| Bear Lake State Park | May 15 | June 5 | October 4 | September 22 | 140 days | – |
| Johnson Pass | May 15 | June 4 | October 5 | September 22 | 142 days | 6b |
| Little Sahara Rec Area | May 15 | June 5 | October 1 | September 17 | 137 days | – |
| Maeser9 mi NW | May 15 | June 7 | October 5 | September 21 | 143 days | 6a |
| Orderville | May 15 | June 4 | October 8 | September 26 | 144 days | 6b |
| Utah Test Range | May 15 | June 4 | October 2 | September 19 | 139 days | 6b |
| Cedar Point | May 16 | June 2 | October 11 | September 29 | 145 days | 6b |
| Delta | May 16 | June 5 | September 29 | September 16 | 137 days | 6a |
| La Sal1 mi SW | May 17 | June 5 | October 6 | September 24 | 141 days | 6a |
| MonticelloMonticello #2 | May 17 | June 4 | October 7 | September 24 | 141 days | – |
| Sundance | May 17 | June 8 | October 5 | September 22 | 138 days | – |
| Thiokol Propulsion F S | May 17 | June 8 | September 24 | September 9 | 128 days | – |
| Trenton | May 17 | June 6 | September 18 | September 1 | 121 days | 6a |
| Castle Dale | May 18 | June 8 | September 27 | September 14 | 128 days | 6a |
| Fort Duchesne | May 19 | June 15 | October 2 | September 19 | 135 days | 5b |
| Jarvie Ranch | May 19 | June 4 | September 28 | September 14 | 132 days | – |
| Monticello (2 mi E) | May 19 | June 6 | October 2 | September 20 | 133 days | 6a |
| Neola | May 19 | June 7 | September 29 | September 17 | 130 days | 6a |
| Wah Wah Ranch | May 19 | June 11 | September 29 | September 16 | 131 days | – |
| Jensen | May 20 | June 5 | September 25 | September 11 | 126 days | 5a |
| Modena | May 20 | June 6 | October 3 | September 22 | 136 days | – |
| Cedar CityCedar City Municipal Airport | May 21 | June 8 | September 29 | September 17 | 130 days | 6a |
| Enterprise | May 21 | June 7 | October 2 | September 21 | 132 days | – |
| RichfieldRichfield Radio KSVC | May 21 | June 7 | September 24 | September 12 | 125 days | 6a |
| Rosette | May 21 | June 11 | October 2 | September 17 | 132 days | 6b |
| Manila | May 22 | June 11 | September 29 | September 15 | 128 days | – |
| Pineview Dam | May 22 | June 8 | September 26 | September 11 | 125 days | 5b |
| Scipio | May 22 | June 10 | September 25 | September 9 | 122 days | 5b |
| Black Rock | May 23 | June 11 | September 27 | September 14 | 124 days | 5b |
| Bryce Canyon National Park Headquarters | May 23 | June 9 | September 27 | September 13 | 125 days | 6b |
| Cedar City (5 mi E) | May 23 | June 8 | October 4 | September 20 | 130 days | – |
| Circleville | May 23 | June 13 | September 27 | September 12 | 125 days | – |
| RooseveltRoosevelt Radio | May 23 | June 9 | September 22 | September 8 | 121 days | 5a |
| Marysvale | May 24 | June 10 | September 25 | September 11 | 123 days | 6a |
| EdenEden-Liberty | May 25 | June 16 | September 26 | September 12 | 123 days | – |
| Morgan | May 25 | June 13 | September 24 | September 11 | 119 days | 6a |
| Flaming Gorge | May 26 | June 10 | September 23 | September 9 | 120 days | 5b |
| Moroni | May 26 | June 13 | September 25 | September 9 | 119 days | – |
| Wellington3 mi E | May 27 | June 11 | September 26 | September 11 | 122 days | – |
| Deer Creek Dam | May 28 | June 15 | September 23 | September 7 | 119 days | 6a |
| Ephraim | May 28 | June 15 | September 20 | September 5 | 113 days | 5b |
| Laketown | May 28 | June 17 | September 24 | September 11 | 119 days | 6a |
| Park City | May 29 | June 14 | September 25 | September 12 | 117 days | – |
| Salina (24 mi E) | May 29 | June 15 | September 26 | September 12 | 118 days | 6a |
| EchoEcho Dam | May 30 | June 16 | September 18 | September 4 | 112 days | 5b |
| Altamont | May 31 | June 16 | September 23 | September 6 | 112 days | 5b |
| Enterprise Beryl Jct | May 31 | June 20 | September 20 | September 6 | 110 days | – |
| Kodachrome Basin Park | May 31 | June 18 | September 28 | September 15 | 116 days | 6b |
| Loa | May 31 | June 14 | September 21 | September 8 | 112 days | – |
| Manti Radio KMTI | May 31 | June 16 | September 21 | September 8 | 114 days | – |
| Snake Creek Powerhouse | May 31 | June 23 | September 11 | August 14 | 101 days | 6a |
| Alton | June 1 | June 15 | September 30 | September 16 | 120 days | 6b |
| BeaverBeaver Canyon Power House | June 1 | June 15 | September 28 | September 13 | 120 days | 6a |
| Vernon | June 1 | June 19 | September 20 | September 4 | 110 days | 6a |
| Fairfield | June 2 | June 24 | September 16 | September 1 | 103 days | 5b |
| Fremont Indian State Park | June 4 | June 21 | September 21 | September 6 | 106 days | 5b |
| Grouse Creek | June 4 | June 22 | September 17 | August 31 | 104 days | – |
| Heber | June 4 | June 21 | September 20 | September 6 | 106 days | 5b |
| HuntsvilleHuntsville Monastery | June 4 | June 22 | September 16 | September 1 | 102 days | 5b |
| Kamas | June 5 | June 23 | September 17 | September 1 | 100 days | 5b |
| Koosharem | June 6 | June 26 | September 21 | September 5 | 104 days | – |
| Blowhard Mountain Radar | June 7 | June 22 | September 29 | September 14 | 110 days | – |
| Coalville | June 7 | June 25 | September 12 | August 28 | 95 days | 5b |
| Alta | June 11 | June 27 | September 18 | September 3 | 98 days | 6a |
| Cedar Breaks National Monument | June 11 | June 27 | October 3 | September 18 | 113 days | – |
| Moon Lake | June 11 | June 24 | September 18 | September 5 | 97 days | – |
| WanshipWanship Dam | June 11 | June 30 | September 12 | August 28 | 92 days | 5b |
| Panguitch | June 12 | June 27 | September 12 | August 31 | 90 days | 5b |
| ScofieldScofield-Skyline Mine | June 13 | June 30 | September 17 | September 1 | 94 days | 6a |
| Ibapah | June 14 | July 1 | September 8 | August 23 | 86 days | 5b |
| Randolph | June 14 | June 30 | September 1 | August 18 | 76 days | – |
| Scofield Dam | June 15 | July 1 | September 12 | August 29 | 87 days | – |
| Angle | June 17 | July 3 | September 12 | August 30 | 85 days | 5b |
| Hatch | June 19 | July 2 | September 13 | September 1 | 83 days | – |
| Brian Head | June 21 | July 6 | September 12 | September 1 | 82 days | – |
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities, growing-season length); station daily lows via ACIS (zone). Growing season: NOAA's median number of days between the last spring and first autumn 32°F night. Zone: the USDA's plant hardiness rule applied to the station's own 1991-2020 coldest nights.