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Colorado frost dates

Across 210 NOAA climate stations in Colorado, the median last spring frost (32°F) ranges from Apr 14 at Grand Junction Wfo to Jun 21 at Vail; the typical station sees its last frost around May 11 and its first fall frost around Oct 4.

“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
Akron 4 E4,542 ftMay 8May 22Oct 6Sep 25149 days
Akron Washington Co AP4,663 ftMay 6May 19Oct 8Sep 27155 days
Alamosa 1E7,540 ftMay 30Jun 13Sep 17Sep 4108 days
Alamosa San Luis AP7,533 ftJun 7Jun 24Sep 15Sep 498 days
Allenspark 3NW8,500 ftJun 14Jun 28Sep 12Aug 2592 days
Altenbern5,637 ftMay 25Jun 13Sep 25Sep 10120 days
Arapahoe 12S4,065 ftMay 5May 19Oct 9Sep 28156 days
Arapahoe 14N4,142 ftMay 9May 22Oct 7Sep 23150 days
Aspen 1SW8,175 ftJun 2Jun 17Sep 23Sep 12113 days
Aspen Pitkin Co AP7,720 ftMay 31Jun 14Sep 23Sep 11114 days
Bailey7,752 ftJun 16Jul 1Sep 8Aug 2784 days
Black Canyon Of The Gunnison8,151 ftMay 23Jun 9Oct 1Sep 20130 days
Black Forest 6WNW6,957 ftMay 11May 25Oct 6Sep 25147 days
Blanca 4 Nw7,709 ftMay 25Jun 12Sep 22Sep 10117 days
Blue Mesa Lake7,568 ftJun 9Jun 24Sep 16Sep 396 days
Bonny Dam 2NE3,717 ftMay 5May 19Oct 10Sep 28155 days
Boulder5,484 ftMay 6May 18Oct 5Sep 21151 days
Boulder 14 W9,828 ftJun 21Jul 4Sep 2Aug 1771 days
Briggsdale4,862 ftMay 12May 25Sep 28Sep 15135 days
Brighton 3 Se5,016 ftMay 3May 16Oct 7Sep 26155 days
Buckhorn Mtn 1 E7,400 ftMay 21Jun 4Sep 29Sep 12128 days
Buena Vista 2S7,954 ftMay 27Jun 11Sep 23Sep 10116 days
Burlington4,162 ftMay 6May 19Oct 9Sep 27155 days
Burlington Carson AP4,192 ftMay 2May 16Oct 10Sep 27160 days
Byers 5 Ene5,101 ftMay 13May 30Oct 2Sep 20142 days
Cabin Creek10,020 ftJun 6Jun 21Sep 19Sep 5103 days
Campo 7 S4,105 ftApr 29May 12Oct 13Oct 1166 days
Canon City5,378 ftMay 4May 18Oct 7Sep 25153 days
Castle Rock6,185 ftMay 9May 24Oct 2Sep 17143 days
Cedaredge 3E6,838 ftMay 3May 21Oct 9Sep 27156 days
Center 4 Ssw7,673 ftMay 24Jun 8Sep 24Sep 12120 days
Cheesman6,880 ftMay 17Jun 6Oct 1Sep 19135 days
Cheraw 1 N4,147 ftApr 30May 13Oct 10Oct 1163 days
Cherry Creek Dam5,647 ftMay 7May 21Oct 8Sep 25152 days
Cheyenne Wells 2NE4,203 ftMay 1May 17Oct 14Oct 1165 days
Cimarron6,890 ftJun 20Jul 7Sep 10Aug 2381 days
Coal Creek Canyon8,950 ftJun 5Jun 19Sep 16Sep 2103 days
Cochetopa Creek8,006 ftJun 21Jul 7Sep 5Aug 2174 days
Collbran 1WSW6,009 ftMay 17Jun 3Sep 30Sep 18136 days
Colorado Nm5,781 ftApr 26May 15Oct 16Oct 1172 days
Colorado Springs Muni AP6,181 ftMay 3May 15Oct 8Sep 26158 days
Cortez6,167 ftMay 12May 31Oct 7Sep 26147 days
Cortez 8 Se8,034 ftMay 6May 27Oct 14Sep 30158 days
Cortez Montezuma Co AP5,914 ftMay 27Jun 11Sep 28Sep 17125 days
Craig 4SW6,496 ftMay 29Jun 13Sep 20Sep 5113 days
Craig Moffat Co AP6,186 ftJun 6Jun 24Sep 12Aug 3196 days
Crestone 2 Se8,004 ftMay 26Jun 9Sep 26Sep 14120 days
Cripple Creek 3NNW9,235 ftMay 26Jun 9Sep 26Sep 13121 days
Crook3,709 ftMay 11May 23Oct 4Sep 23145 days
Cumbre Vista - Colorado Spgs 16,942 ftMay 9May 20Oct 6Sep 27150 days
Del Norte 3ENE7,845 ftMay 23Jun 8Sep 25Sep 13123 days
Delta 3E5,027 ftMay 1May 14Oct 7Sep 26159 days
Denver Centennial AP5,883 ftMay 5May 17Oct 8Sep 25154 days
Denver Intl AP5,414 ftMay 5May 19Oct 9Sep 27156 days
Denver Water Dept5,228 ftApr 30May 13Oct 12Sep 28165 days
Denver-Stapleton5,286 ftMay 4May 16Oct 8Sep 25156 days
Dinosaur 2 E6,062 ftMay 2May 17Oct 14Sep 30161 days
Dinosaur Nm5,960 ftMay 12Jun 1Oct 5Sep 23146 days
Divide 4NW9,134 ftJun 1Jun 17Sep 21Sep 7110 days
Dove Creek6,863 ftMay 11May 25Oct 12Sep 29152 days
Durango6,761 ftMay 21Jun 7Oct 2Sep 19134 days
Durango La Plata Co AP6,660 ftJun 1Jun 15Sep 27Sep 15116 days
Eads4,212 ftApr 30May 12Oct 13Oct 1165 days
Eastonville 2 Nnw7,210 ftMay 29Jun 13Sep 21Sep 9114 days
Elizabeth 2NW6,611 ftMay 16Jun 1Oct 2Sep 18137 days
Ellicott 7S5,739 ftMay 6May 28Oct 3Sep 21149 days
Estes Park 3 Sse7,812 ftMay 30Jun 14Sep 17Sep 3109 days
Evergreen6,985 ftMay 23Jun 10Sep 22Sep 6118 days
Fairplay S Park Rd9,995 ftJun 16Jun 30Sep 9Aug 2183 days
Flagler 1S4,921 ftMay 5May 20Oct 8Sep 27155 days
Fleming 3SW4,256 ftMay 4May 16Oct 11Sep 29157 days
Fruita4,498 ftApr 27May 7Oct 11Sep 28164 days
Ft Collins5,004 ftMay 2May 14Oct 7Sep 24157 days
Ft Collins 4 E4,920 ftMay 3May 15Oct 6Sep 22154 days
Ft Lewis7,614 ftJun 1Jun 19Sep 27Sep 13116 days
Ft Morgan4,376 ftMay 6May 19Oct 6Sep 24153 days
Gateway 1ENE4,671 ftApr 20May 5Oct 21Oct 7182 days
Genoa5,593 ftMay 8May 22Oct 10Sep 28155 days
Georgetown8,520 ftMay 30Jun 14Sep 19Sep 5112 days
Glade Park 17W6,323 ftMay 21Jun 9Sep 26Sep 14126 days
Glenwood Spgs #25,895 ftMay 13May 30Oct 3Sep 20142 days
Grand Junction 6ESE4,760 ftApr 23May 9Oct 20Oct 5179 days
Grand Junction Walker Fld4,858 ftApr 28May 14Oct 16Oct 3171 days
Grand Junction Wfo4,826 ftApr 14Apr 28Oct 23Oct 11190 days
Grand Lake 6 Ssw8,288 ftJun 13Jun 28Sep 7Aug 2184 days
Grant8,675 ftJun 15Jun 30Sep 9Aug 2684 days
Great Sand Dunes Np & Preserve8,183 ftMay 21Jun 3Oct 1Sep 19131 days
Greeley Unc4,715 ftMay 2May 14Oct 8Sep 26159 days
Green Mt Dam7,740 ftJun 6Jun 23Sep 14Aug 3198 days
Gross Rsvr7,970 ftMay 24Jun 10Sep 23Sep 9120 days
Guffey 9SE8,915 ftMay 19May 31Oct 2Sep 19134 days
Hayden6,467 ftJun 1Jun 16Sep 20Sep 7109 days
Holly3,401 ftMay 1May 14Oct 12Sep 29163 days
Holyoke3,780 ftMay 11May 23Oct 3Sep 20144 days
Hugo 1 Nw5,025 ftMay 10May 25Oct 2Sep 21143 days
Idalia3,965 ftMay 4May 17Oct 9Sep 24155 days
Ignacio 6ESE6,548 ftMay 23Jun 7Sep 29Sep 18128 days
Joes4,275 ftMay 3May 15Oct 9Sep 29158 days
John Martin Dam3,814 ftApr 24May 8Oct 15Oct 2172 days
Julesburg3,477 ftMay 7May 18Oct 6Sep 23152 days
Karval5,075 ftMay 9May 23Oct 6Sep 25149 days
Kassler5,587 ftMay 8May 22Oct 3Sep 21147 days
Kim 10SSE5,257 ftApr 24May 6Oct 18Oct 4175 days
Kim 15 Nne5,190 ftMay 5May 19Oct 9Sep 27156 days
Kit Carson4,302 ftMay 10May 24Oct 1Sep 20142 days
Kit Carson 9NNE4,346 ftMay 7May 24Oct 6Sep 25151 days
Kremmling7,460 ftJun 14Jun 30Sep 5Aug 2680 days
La Junta4,089 ftApr 26May 9Oct 15Oct 3171 days
La Junta 17 Wsw4,386 ftMay 8May 25Oct 4Sep 24148 days
La Junta 20 S4,210 ftApr 27May 11Oct 14Oct 2168 days
La Junta Muni AP4,194 ftApr 24May 6Oct 15Oct 3173 days
Lake City8,667 ftJun 8Jun 24Sep 17Sep 6101 days
Lake City 1NNE8,714 ftJun 9Jun 22Sep 17Sep 599 days
Lake George 8 Sw8,550 ftJun 2Jun 17Sep 19Sep 6108 days
Lakewood5,640 ftMay 3May 18Oct 7Sep 24155 days
Lamar3,627 ftApr 30May 13Oct 10Oct 1163 days
Lamar Muni AP3,704 ftMay 2May 17Oct 7Sep 28157 days
Las Animas3,890 ftApr 29May 11Oct 12Oct 2166 days
Lemon Dam8,110 ftMay 28Jun 10Sep 30Sep 15122 days
Leroy 5 Wsw4,467 ftMay 10May 22Oct 6Sep 22147 days
Limon Wsmo5,364 ftMay 21Jun 4Sep 26Sep 14127 days
Lindon 5 Wnw4,851 ftMay 15May 30Oct 2Sep 20139 days
Longmont 2 Ese4,950 ftMay 7May 22Oct 5Sep 23151 days
Loveland 2N5,080 ftMay 10May 22Oct 1Sep 15142 days
Manassa7,695 ftMay 28Jun 11Sep 21Sep 9115 days
Mancos 1SW6,897 ftJun 4Jun 19Sep 24Sep 9111 days
Marston Fltr Plt5,610 ftMay 2May 17Oct 11Sep 27160 days
Massadona 3E6,140 ftMay 10May 27Oct 4Sep 20147 days
Matheson 8 Se5,830 ftMay 12May 26Oct 2Sep 19141 days
Maybell5,944 ftJun 16Jul 1Sep 9Aug 2683 days
Meeker6,229 ftJun 4Jun 23Sep 16Sep 3104 days
Meeker AP6,390 ftMay 30Jun 13Sep 22Sep 10117 days
Mesa Verde Np7,142 ftMay 9May 27Oct 14Oct 1156 days
Monte Vista 2W7,695 ftJun 11Jun 25Sep 13Sep 192 days
Montrose #25,789 ftApr 28May 12Oct 14Oct 1167 days
Montrose 11 Ene8,402 ftMay 20Jun 4Oct 1Sep 19132 days
Montrose Rgnl AP5,759 ftMay 2May 17Oct 8Sep 26157 days
Monument7,080 ftMay 14May 31Oct 1Sep 16138 days
Monument 3S6,821 ftMay 17May 30Oct 1Sep 19136 days
New Raymer4,783 ftMay 9May 22Oct 4Sep 21146 days
New Raymer 21 N5,180 ftMay 18Jun 2Sep 29Sep 15133 days
Northdale6,681 ftJun 3Jun 19Sep 25Sep 12113 days
Northglenn5,407 ftMay 2May 14Oct 11Sep 26160 days
Norwood7,020 ftMay 25Jun 13Oct 1Sep 14128 days
Norwood #27,011 ftMay 21Jun 5Oct 1Sep 19131 days
Nunn 7 Nne5,390 ftMay 13May 27Sep 27Sep 14136 days
Ordway 1 Ene4,312 ftMay 2May 14Oct 8Sep 25159 days
Ordway 21 N4,767 ftMay 3May 16Oct 7Sep 27155 days
Ouray7,840 ftMay 17Jun 3Oct 1Sep 19137 days
Ouray #27,718 ftMay 18May 31Oct 4Sep 24139 days
Palisade4,751 ftApr 17May 3Oct 26Oct 12190 days
Paonia 1SW5,581 ftMay 3May 18Oct 12Sep 27159 days
Paradox 2N5,447 ftMay 11May 29Oct 5Sep 23146 days
Parker5,904 ftMay 9May 23Oct 3Sep 21145 days
Placerville7,383 ftMay 26Jun 6Sep 29Sep 17125 days
Pueblo Mem AP4,720 ftApr 30May 12Oct 9Sep 27161 days
Pueblo Rsvr4,861 ftApr 26May 8Oct 13Sep 30166 days
Ralston Rsvr5,900 ftMay 3May 17Oct 14Sep 30161 days
Rangely 1E5,277 ftMay 15Jun 2Oct 1Sep 19136 days
Ridgway7,049 ftJun 11Jun 30Sep 13Sep 192 days
Rifle 3ENE5,469 ftMay 23Jun 6Sep 25Sep 13124 days
Rifle Garfield Co AP5,530 ftMay 11May 27Oct 4Sep 23143 days
Rio Grande Rsvr9,492 ftJun 15Jun 30Sep 11Aug 2785 days
Rocky Ford 2 Se4,170 ftMay 1May 14Oct 8Sep 26159 days
Roxborough Sp6,117 ftMay 16Jun 1Oct 1Sep 17136 days
Rush 1N6,054 ftMay 9May 22Oct 4Sep 21146 days
Rustic 9WSW7,700 ftJun 5Jun 20Sep 16Sep 5101 days
Ruxton Park9,060 ftJun 3Jun 23Sep 17Aug 30102 days
Rye 1SW7,141 ftMay 5May 20Oct 10Sep 27156 days
Saguache7,701 ftMay 16May 31Sep 28Sep 18135 days
Salida7,160 ftMay 29Jun 12Sep 20Sep 8112 days
San Luis 1 S7,943 ftMay 31Jun 14Sep 23Sep 10115 days
Sedgwick 5 S3,996 ftMay 6May 18Oct 7Sep 24152 days
Seibert4,706 ftMay 4May 17Oct 11Sep 25158 days
Shaw 4ENE5,000 ftMay 12May 26Oct 4Sep 21143 days
Sheep Mtn7,744 ftMay 27Jun 10Sep 25Sep 11119 days
Sheridan Lake4,070 ftApr 27May 10Oct 15Oct 2170 days
Sheridan Lake 4E4,039 ftApr 28May 12Oct 13Oct 1167 days
Shoshone5,992 ftMay 1May 14Oct 14Oct 1164 days
Springfield Comanche4,383 ftMay 3May 17Oct 10Sep 29158 days
Steamboat Springs6,866 ftJun 9Jun 24Sep 12Aug 3193 days
Sterling3,974 ftApr 30May 12Oct 9Sep 28161 days
Stratton4,399 ftMay 6May 17Oct 9Sep 26155 days
Strontia Springs Dam5,840 ftMay 16Jun 6Sep 29Sep 16132 days
Tacony 13 Se4,882 ftMay 5May 16Oct 6Sep 26153 days
Taylor Park9,179 ftJun 20Jul 2Sep 8Aug 2580 days
Trinidad6,030 ftApr 30May 11Oct 15Oct 1167 days
Trinidad Lake6,310 ftMay 11May 25Oct 4Sep 22145 days
Trinidad Perry Stokes AP5,741 ftMay 4May 19Oct 9Sep 28156 days
Twin Lakes Rsvr9,236 ftJun 16Jun 29Sep 10Aug 2485 days
Uravan5,021 ftApr 26May 8Oct 18Oct 6174 days
Vail8,304 ftJun 21Jul 9Sep 7Aug 2677 days
Vallecito Dam7,644 ftMay 31Jun 14Sep 26Sep 14119 days
Vallecito Reservoir7,673 ftMay 18Jun 6Oct 11Sep 27145 days
Virginia Dale 7 Ene7,015 ftMay 31Jun 15Sep 19Sep 5110 days
Walsenburg 1 Nw6,292 ftMay 6May 20Oct 4Sep 23149 days
Walsh 1 W3,978 ftApr 30May 12Oct 14Oct 1166 days
Waterdale5,230 ftMay 12May 30Oct 1Sep 18141 days
Waverly 1W7,603 ftJun 6Jun 22Sep 15Sep 3100 days
Westcliffe7,873 ftJun 11Jun 28Sep 9Aug 2889 days
Wfo Pueblo4,653 ftApr 30May 12Oct 9Sep 28162 days
Wheat Ridge 25,398 ftMay 5May 18Oct 5Sep 20151 days
Wild Horse 6N4,654 ftMay 4May 17Oct 8Sep 26155 days
Williams Fork Dam7,618 ftJun 12Jun 25Sep 10Aug 3189 days
Woodrow 6NNE4,374 ftMay 15May 28Oct 1Sep 21140 days
Wray3,553 ftMay 7May 19Oct 6Sep 25151 days
Yampa7,857 ftJun 14Jun 28Sep 11Aug 2989 days
Yellow Jacket 2W6,933 ftMay 17Jun 4Oct 9Sep 24145 days
Yellow Jacket 4NE7,090 ftMay 15May 31Oct 8Sep 26147 days
Yuma4,134 ftMay 1May 13Oct 12Sep 30164 days
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