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Utah frost dates

Across 169 NOAA climate stations in Utah, the median last spring frost (32°F) ranges from Mar 9 at Hite Rs to Jun 21 at Brian Head; the typical station sees its last frost around May 11 and its first fall frost around Oct 5.

“Median” dates have a 50% chance of a later spring frost or an earlier fall frost. “10% risk” dates are the safer choice for tender plants: only 1 year in 10 has frost beyond them. Source: NOAA NCEI 1991–2020 Climate Normals. Elevation matters: within a state, frost dates can differ by a month or more between valleys and hills.

StationElevationLast frost (median)Last frost (10% risk)First frost (median)First frost (10% risk)Growing season
Alpine5,100 ftMay 3May 26Oct 12Sep 29159 days
Alta8,710 ftJun 11Jun 27Sep 18Sep 398 days
Altamont6,456 ftMay 31Jun 16Sep 23Sep 6112 days
Alton7,098 ftJun 1Jun 15Sep 30Sep 16120 days
Angle6,410 ftJun 17Jul 3Sep 12Aug 3085 days
Arches Np Hqs4,093 ftApr 2Apr 23Oct 30Oct 12207 days
Bear Lake Sp5,928 ftMay 15Jun 5Oct 4Sep 22140 days
Beaver Canyon Pwr House7,275 ftJun 1Jun 15Sep 28Sep 13120 days
Big Water4,100 ftApr 8Apr 28Nov 1Oct 18204 days
Black Rock4,916 ftMay 23Jun 11Sep 27Sep 14124 days
Blanding6,032 ftApr 28May 16Oct 21Oct 6174 days
Blowhard Mtn Radar10,694 ftJun 7Jun 22Sep 29Sep 14110 days
Bluff4,319 ftApr 24May 9Oct 13Oct 1172 days
Boulder6,650 ftMay 4May 25Oct 14Sep 30160 days
Bountiful Bench4,950 ftApr 25May 14Oct 24Oct 9181 days
Bountiful-Val Verda4,540 ftApr 24May 14Oct 19Oct 5178 days
Brian Head9,770 ftJun 21Jul 6Sep 12Sep 182 days
Brigham City 28 Wnw4,951 ftMay 12Jun 8Oct 5Sep 24144 days
Brigham City Waste Plt4,240 ftMay 5May 29Oct 5Sep 20150 days
Bryce Canyon Np Hqrs7,890 ftMay 23Jun 9Sep 27Sep 13125 days
Bullfrog Basin3,822 ftMar 25Apr 12Nov 10Oct 26227 days
Callao4,342 ftMay 14Jun 4Sep 28Sep 14135 days
Canyonlands-The Neck5,871 ftApr 25May 13Oct 23Oct 6180 days
Canyonlands-The Needles4,906 ftApr 30May 16Oct 11Sep 27164 days
Capitol Reef Np5,500 ftApr 18May 3Oct 28Oct 14192 days
Castle Dale5,629 ftMay 18Jun 8Sep 27Sep 14128 days
Castle Valley4,725 ftApr 17May 3Oct 23Oct 9185 days
Castle Valley 1SE4,905 ftApr 19May 3Oct 21Oct 8184 days
Cedar Breaks Nm10,372 ftJun 11Jun 27Oct 3Sep 18113 days
Cedar City6,090 ftMay 4May 28Oct 13Sep 30159 days
Cedar City 5E6,465 ftMay 23Jun 8Oct 4Sep 20130 days
Cedar City Muni AP5,586 ftMay 21Jun 8Sep 29Sep 17130 days
Cedar Pt6,760 ftMay 16Jun 2Oct 11Sep 29145 days
Circleville6,050 ftMay 23Jun 13Sep 27Sep 12125 days
City Creek Wtp5,340 ftMay 13May 31Oct 7Sep 26146 days
Coalville5,550 ftJun 7Jun 25Sep 12Aug 2895 days
Cottonwood Weir4,986 ftApr 29May 30Oct 22Oct 6174 days
Cutler Dam4,290 ftMay 3May 24Oct 12Sep 27160 days
Deer Creek Dam5,270 ftMay 28Jun 15Sep 23Sep 7119 days
Delta4,620 ftMay 16Jun 5Sep 29Sep 16137 days
Deseret4,590 ftMay 14May 31Sep 30Sep 16137 days
Dewey4,120 ftApr 27May 9Oct 9Sep 28165 days
Dinosaur Nm-Quarry Area4,802 ftMay 1May 23Oct 6Sep 25156 days
Draper-Point Of Mtn4,506 ftApr 18May 6Oct 22Oct 7185 days
Duchesne5,551 ftMay 6May 26Oct 5Sep 24150 days
Dugway4,345 ftMay 11May 29Oct 2Sep 19143 days
Echo Dam5,470 ftMay 30Jun 16Sep 18Sep 4112 days
Eden-Liberty5,195 ftMay 25Jun 16Sep 26Sep 12123 days
Enterprise5,320 ftMay 21Jun 7Oct 2Sep 21132 days
Enterprise Beryl Jct5,150 ftMay 31Jun 20Sep 20Sep 6110 days
Ephraim5,498 ftMay 28Jun 15Sep 20Sep 5113 days
Escalante5,810 ftMay 8May 24Oct 10Sep 26155 days
Eskdale4,980 ftMay 12Jun 3Oct 1Sep 19140 days
Fairfield4,880 ftJun 2Jun 24Sep 16Sep 1103 days
Farmington 3 Nw4,380 ftApr 19May 7Oct 19Oct 6181 days
Ferron5,923 ftMay 6May 27Oct 10Sep 28156 days
Fillmore5,127 ftMay 4May 26Oct 14Sep 30160 days
Fish Springs Nwr4,357 ftApr 26May 17Oct 14Oct 1169 days
Flaming Gorge6,244 ftMay 26Jun 10Sep 23Sep 9120 days
Fremont Indian Sp5,920 ftJun 4Jun 21Sep 21Sep 6106 days
Ft Duchesne5,052 ftMay 19Jun 15Oct 2Sep 19135 days
Garfield4,298 ftApr 3Apr 19Nov 4Oct 18213 days
Goblin Valley Sp4,960 ftApr 26May 10Oct 18Oct 2173 days
Granite Peak Dugway Pg4,300 ftApr 18May 5Oct 16Oct 2179 days
Grantsville 2W4,550 ftMay 2May 19Oct 14Sep 30164 days
Grouse Creek5,320 ftJun 4Jun 22Sep 17Aug 31104 days
Hanksville4,308 ftMay 5May 23Oct 3Sep 21149 days
Hans Flat Rs6,600 ftMay 1May 24Oct 16Oct 2163 days
Hatch6,893 ftJun 19Jul 2Sep 13Sep 183 days
Heber5,590 ftJun 4Jun 21Sep 20Sep 6106 days
Hite Rs3,850 ftMar 9Apr 5Nov 20Nov 4253 days
Hovenweep Nm5,240 ftMay 2May 21Oct 10Sep 27159 days
Huntsville Monastery5,140 ftJun 4Jun 22Sep 16Sep 1102 days
Ibapah5,279 ftJun 14Jul 1Sep 8Aug 2386 days
Jarvie Rch5,454 ftMay 19Jun 4Sep 28Sep 14132 days
Jensen4,736 ftMay 20Jun 5Sep 25Sep 11126 days
Johnson Pass5,580 ftMay 15Jun 4Oct 5Sep 22142 days
Kamas6,481 ftJun 5Jun 23Sep 17Sep 1100 days
Kanab4,900 ftApr 29May 18Oct 22Oct 6175 days
Kanosh4,382 ftApr 30May 21Oct 19Oct 3172 days
Kodachrome Basin Park5,805 ftMay 31Jun 18Sep 28Sep 15116 days
Koosharem6,930 ftJun 6Jun 26Sep 21Sep 5104 days
La Sal 1SW6,787 ftMay 17Jun 5Oct 6Sep 24141 days
La Verkin3,194 ftApr 1Apr 24Nov 5Oct 23217 days
Laketown5,980 ftMay 28Jun 17Sep 24Sep 11119 days
Levan5,298 ftMay 10May 31Oct 7Sep 24148 days
Little Sahara Rec Area5,230 ftMay 15Jun 5Oct 1Sep 17137 days
Loa7,070 ftMay 31Jun 14Sep 21Sep 8112 days
Logan 5 Sw Exp Farm4,488 ftMay 12May 29Sep 28Sep 14138 days
Logan Cache AP4,454 ftMay 8May 29Oct 2Sep 19144 days
Logan Radio Kvnu4,475 ftMay 8Jun 2Oct 2Sep 18145 days
Logan Utah St Univ4,790 ftApr 30May 19Oct 16Oct 1166 days
Lytle Rch2,787 ftMar 18Apr 16Nov 9Oct 22234 days
Maeser 9NW6,448 ftMay 15Jun 7Oct 5Sep 21143 days
Manila6,393 ftMay 22Jun 11Sep 29Sep 15128 days
Manti5,740 ftMay 11Jun 1Oct 6Sep 24146 days
Manti Radio Kmti5,498 ftMay 31Jun 16Sep 21Sep 8114 days
Marysvale5,845 ftMay 24Jun 10Sep 25Sep 11123 days
Mexican Hat4,109 ftApr 11Apr 26Oct 30Oct 17201 days
Milford5,009 ftMay 10Jun 1Oct 2Sep 20144 days
Milford Muni AP5,040 ftMay 13Jun 2Oct 4Sep 22143 days
Moab4,053 ftApr 11Apr 28Oct 23Oct 8192 days
Moab Canyonland AP4,561 ftApr 22May 8Oct 20Oct 6179 days
Modena5,460 ftMay 20Jun 6Oct 3Sep 22136 days
Monticello #27,086 ftMay 17Jun 4Oct 7Sep 24141 days
Monticello 2E6,820 ftMay 19Jun 6Oct 2Sep 20133 days
Moon Lake8,125 ftJun 11Jun 24Sep 18Sep 597 days
Morgan5,100 ftMay 25Jun 13Sep 24Sep 11119 days
Moroni5,580 ftMay 26Jun 13Sep 25Sep 9119 days
Mtn Dell Dam5,420 ftMay 7May 27Oct 14Sep 29158 days
Myton5,085 ftMay 7May 25Oct 5Sep 22149 days
Natural Bridges Nm6,508 ftMay 5May 27Oct 13Sep 29157 days
Neola5,950 ftMay 19Jun 7Sep 29Sep 17130 days
Nephi5,146 ftMay 6May 24Oct 10Sep 28156 days
New Harmony5,167 ftMay 9May 29Oct 11Sep 27155 days
Oak City5,095 ftMay 2May 21Oct 13Sep 30162 days
Ogden Hinkley AP4,470 ftApr 22May 10Oct 22Oct 7180 days
Ogden Ne Bench4,572 ftApr 19May 4Oct 22Oct 7186 days
Ogden Pioneer Ph4,350 ftApr 21May 6Oct 23Oct 8184 days
Ogden Sugar Factory4,280 ftApr 22May 9Oct 18Oct 1177 days
Orderville5,460 ftMay 15Jun 4Oct 8Sep 26144 days
Orem Trtmt Plt4,510 ftApr 19May 9Oct 19Oct 5182 days
Ouray 4NE4,674 ftMay 2May 16Oct 3Sep 21152 days
Panguitch6,647 ftJun 12Jun 27Sep 12Aug 3190 days
Paria Rs4,426 ftApr 19May 9Oct 23Oct 9186 days
Park City6,900 ftMay 29Jun 14Sep 25Sep 12117 days
Partoun4,780 ftMay 13Jun 5Sep 29Sep 16137 days
Pineview Dam4,940 ftMay 22Jun 8Sep 26Sep 11125 days
Pleasant Grove4,692 ftApr 17May 7Oct 25Oct 10188 days
Price Carbon Co AP5,921 ftMay 3May 21Oct 12Sep 29160 days
Provo Byu4,570 ftApr 18May 5Oct 21Oct 7185 days
Randolph6,290 ftJun 14Jun 30Sep 1Aug 1876 days
Richfield Radio Ksvc5,285 ftMay 21Jun 7Sep 24Sep 12125 days
Richmond4,680 ftMay 11Jun 2Oct 5Sep 21143 days
Roosevelt Radio5,014 ftMay 23Jun 9Sep 22Sep 8121 days
Rosette5,685 ftMay 21Jun 11Oct 2Sep 17132 days
Salina 24 E7,560 ftMay 29Jun 15Sep 26Sep 12118 days
Salt Lake City E Bench4,850 ftApr 25May 10Oct 18Oct 5175 days
Salt Lake City Intl AP4,225 ftApr 8Apr 30Oct 31Oct 17204 days
Salt Lake Triad Ctr4,280 ftMar 31Apr 19Nov 8Oct 23224 days
Santaquin Chlorinator5,160 ftMay 4May 28Oct 11Sep 27157 days
Scipio5,314 ftMay 22Jun 10Sep 25Sep 9122 days
Scofield Dam7,630 ftJun 15Jul 1Sep 12Aug 2987 days
Scofield-Skyline Mine8,697 ftJun 13Jun 30Sep 17Sep 194 days
Snake Creek Powerhouse6,010 ftMay 31Jun 23Sep 11Aug 14101 days
Spanish Fk Pwr House4,720 ftApr 25May 13Oct 18Oct 4174 days
St George2,857 ftMar 14Apr 6Nov 10Oct 27239 days
Sundance6,620 ftMay 17Jun 8Oct 5Sep 22138 days
Sunnyside City6,511 ftApr 26May 18Oct 25Oct 7181 days
Sunnyside City Ctr6,530 ftMay 5May 26Oct 15Sep 30159 days
Thiokol Propulsion F S4,600 ftMay 17Jun 8Sep 24Sep 9128 days
Timpanogos Cave5,740 ftMay 2May 26Oct 16Oct 1161 days
Tooele4,944 ftMay 2May 28Oct 16Oct 2165 days
Torrey 7 E6,204 ftApr 22May 9Oct 23Oct 9183 days
Tremonton4,310 ftApr 24May 9Oct 17Oct 3175 days
Trenton4,455 ftMay 17Jun 6Sep 18Sep 1121 days
Utah Lake Lehi4,505 ftApr 30May 27Oct 9Sep 26159 days
Utah Test Range4,440 ftMay 15Jun 4Oct 2Sep 19139 days
Valley Of The Gods5,287 ftMar 29Apr 15Nov 6Oct 23223 days
Vernal5,345 ftMay 7May 28Oct 6Sep 23150 days
Vernal Municipal AP5,260 ftMay 6May 25Oct 7Sep 25153 days
Vernon5,471 ftJun 1Jun 19Sep 20Sep 4110 days
Veyo Powerhouse4,600 ftApr 9Apr 28Nov 5Oct 21207 days
Wah Wah Rch4,880 ftMay 19Jun 11Sep 29Sep 16131 days
Wanship Dam5,940 ftJun 11Jun 30Sep 12Aug 2892 days
Weber Basin Pump Plt 34,900 ftApr 29May 25Oct 20Oct 1172 days
Wellington 3 E5,400 ftMay 27Jun 11Sep 26Sep 11122 days
Wendover AP Awos4,237 ftApr 18May 5Oct 23Oct 13188 days
Zion Np4,038 ftApr 13May 2Nov 2Oct 20202 days
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