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Colorado frost dates by weather station

Colorado has 234 NOAA weather stations with 1991–2020 freeze statistics. Median last spring frost dates run from Apr 14 at Grand Junction WFO to Jun 21 at Vail.

234Stations
Apr 14Earliest last frostGrand Junction WFO
Jun 21Latest last frostVail
190 daysLongest growing seasonPalisade

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Colorado stations: median (50%) frost dates at 32°F
Station	Last spring frost	First fall frost	Growing season	Elevation
Akron 4 E	May 8	Oct 6	149 days	4,542 ft
Akron Washington Co Airport	May 6	Oct 8	155 days	4,663 ft
Alamosa 1e	May 30	Sep 17	108 days	7,540 ft
Alamosa San Luis Airport	Jun 7	Sep 15	98 days	7,533 ft
Allenspark 3nw	Jun 14	Sep 12	92 days	8,500 ft
Altenbern	May 25	Sep 25	120 days	5,637 ft
Antero Rsvr	any month	any month	57 days	8,939 ft
Arapahoe 12s	May 5	Oct 9	156 days	4,065 ft
Arapahoe 14n	May 9	Oct 7	150 days	4,142 ft
Aspen 1sw	Jun 2	Sep 23	113 days	8,175 ft
Aspen Pitkin Co Airport	May 31	Sep 23	114 days	7,720 ft
Bailey	Jun 16	Sep 8	84 days	7,752 ft
Black Canyon Of The Gunnison	May 23	Oct 1	130 days	8,151 ft
Black Forest 6wnw	May 11	Oct 6	147 days	6,957 ft
Blanca 4 NW	May 25	Sep 22	117 days	7,709 ft
Blue Mesa Lake	Jun 9	Sep 16	96 days	7,568 ft
Bonham Rsvr	any month	any month	79 days	9,852 ft
Bonny Dam 2ne	May 5	Oct 10	155 days	3,717 ft
Boulder	May 6	Oct 5	151 days	5,484 ft
Boulder 14 W	Jun 21	Sep 2	71 days	9,828 ft
Briggsdale	May 12	Sep 28	135 days	4,862 ft
Brighton 3 SE	May 3	Oct 7	155 days	5,016 ft
Buckhorn Mountain 1 E	May 21	Sep 29	128 days	7,400 ft
Buena Vista 2s	May 27	Sep 23	116 days	7,954 ft
Burlington	May 6	Oct 9	155 days	4,162 ft
Burlington Carson Airport	May 2	Oct 10	160 days	4,192 ft
Byers 5 ENE	May 13	Oct 2	142 days	5,101 ft
Cabin Creek	Jun 6	Sep 19	103 days	10,020 ft
Campo 7 S	Apr 29	Oct 13	166 days	4,105 ft
Canon City	May 4	Oct 7	153 days	5,378 ft
Castle Rock	May 9	Oct 2	143 days	6,185 ft
Cedaredge 3e	May 3	Oct 9	156 days	6,838 ft
Center 4 SSW	May 24	Sep 24	120 days	7,673 ft
Cheesman	May 17	Oct 1	135 days	6,880 ft
Cheraw 1 N	Apr 30	Oct 10	163 days	4,147 ft
Cherry Creek Dam	May 7	Oct 8	152 days	5,647 ft
Cheyenne Wells 2ne	May 1	Oct 14	165 days	4,203 ft
Cimarron	Jun 20	Sep 10	81 days	6,890 ft
Climax	any month	any month	61 days	11,344 ft
Coal Creek Canyon	Jun 5	Sep 16	103 days	8,950 ft
Cochetopa Creek	Jun 21	Sep 5	74 days	8,006 ft
Collbran 1wsw	May 17	Sep 30	136 days	6,009 ft
Colorado National Monument	Apr 26	Oct 16	172 days	5,781 ft
Colorado Springs Muni Airport	May 3	Oct 8	158 days	6,181 ft
Cortez	May 12	Oct 7	147 days	6,167 ft
Cortez 8 SE	May 6	Oct 14	158 days	8,034 ft
Cortez Montezuma Co Airport	May 27	Sep 28	125 days	5,914 ft
Craig 4sw	May 29	Sep 20	113 days	6,496 ft
Craig Moffat Co Airport	Jun 6	Sep 12	96 days	6,186 ft
Creede	any month	any month	81 days	8,852 ft
Creede Water Plant	any month	any month	59 days	8,624 ft
Crested Butte	any month	any month	47 days	8,867 ft
Crestone 2 SE	May 26	Sep 26	120 days	8,004 ft
Cripple Creek 3nnw	May 26	Sep 26	121 days	9,235 ft
Crook	May 11	Oct 4	145 days	3,709 ft
Cumbre Vista - Colorado Springs 1	May 9	Oct 6	150 days	6,942 ft
Del Norte 3ene	May 23	Sep 25	123 days	7,845 ft
Delta 3e	May 1	Oct 7	159 days	5,027 ft
Denver Centennial Airport	May 5	Oct 8	154 days	5,883 ft
Denver Intl Airport	May 5	Oct 9	156 days	5,414 ft
Denver Water Dept	Apr 30	Oct 12	165 days	5,228 ft
Denver-Stapleton	May 4	Oct 8	156 days	5,286 ft
Dillon 1 E	any month	any month	41 days	9,065 ft
Dinosaur 2 E	May 2	Oct 14	161 days	6,062 ft
Dinosaur National Monument	May 12	Oct 5	146 days	5,960 ft
Divide 4nw	Jun 1	Sep 21	110 days	9,134 ft
Dove Creek	May 11	Oct 12	152 days	6,863 ft
Durango	May 21	Oct 2	134 days	6,761 ft
Durango La Plata Co Airport	Jun 1	Sep 27	116 days	6,660 ft
Eads	Apr 30	Oct 13	165 days	4,212 ft
Eastonville 2 NNW	May 29	Sep 21	114 days	7,210 ft
Elizabeth 2nw	May 16	Oct 2	137 days	6,611 ft
Ellicott 7s	May 6	Oct 3	149 days	5,739 ft
Estes Park 3 SSE	May 30	Sep 17	109 days	7,812 ft
Evergreen	May 23	Sep 22	118 days	6,985 ft
Fairplay S Park Rd	Jun 16	Sep 9	83 days	9,995 ft
Flagler 1s	May 5	Oct 8	155 days	4,921 ft
Fleming 3sw	May 4	Oct 11	157 days	4,256 ft
Florissant Fossil Bed	any month	any month	68 days	8,402 ft
Fort Collins	May 2	Oct 7	157 days	5,004 ft
Fort Collins 4 E	May 3	Oct 6	154 days	4,920 ft
Fort Lewis	Jun 1	Sep 27	116 days	7,614 ft
Fort Morgan	May 6	Oct 6	153 days	4,376 ft
Fraser	any month	any month	32 days	8,560 ft
Fruita	Apr 27	Oct 11	164 days	4,498 ft
Gateway 1ene	Apr 20	Oct 21	182 days	4,671 ft
Genoa	May 8	Oct 10	155 days	5,593 ft
Georgetown	May 30	Sep 19	112 days	8,520 ft
Glade Park 17w	May 21	Sep 26	126 days	6,323 ft
Glenwood Springs #2	May 13	Oct 3	142 days	5,895 ft
Gould 4se Sfsp	any month	any month	51 days	9,000 ft
Grand Junction 6ese	Apr 23	Oct 20	179 days	4,760 ft
Grand Junction WFO	Apr 14	Oct 23	190 days	4,826 ft
Grand Junction Walker Field	Apr 28	Oct 16	171 days	4,858 ft
Grand Lake 1 NW	any month	any month	54 days	8,720 ft
Grand Lake 6 SSW	Jun 13	Sep 7	84 days	8,288 ft
Grant	Jun 15	Sep 9	84 days	8,675 ft
Great Sand Dunes National Park & Preserve	May 21	Oct 1	131 days	8,183 ft
Greeley Unc	May 2	Oct 8	159 days	4,715 ft
Green Mount Dam	Jun 6	Sep 14	98 days	7,740 ft
Gross Rsvr	May 24	Sep 23	120 days	7,970 ft
Guffey 9se	May 19	Oct 2	134 days	8,915 ft
Gunnison 3sw	any month	any month	75 days	7,622 ft
Hayden	Jun 1	Sep 20	109 days	6,467 ft
Hermit 8 SE	any month	any month	62 days	8,949 ft
Hohnholz Rch	any month	any month	56 days	7,797 ft
Holly	May 1	Oct 12	163 days	3,401 ft
Holyoke	May 11	Oct 3	144 days	3,780 ft
Hourglass Rsvr	any month	any month	69 days	9,520 ft
Hugo 1 NW	May 10	Oct 2	143 days	5,025 ft
Idalia	May 4	Oct 9	155 days	3,965 ft
Ignacio 6ese	May 23	Sep 29	128 days	6,548 ft
Joes	May 3	Oct 9	158 days	4,275 ft
John Martin Dam	Apr 24	Oct 15	172 days	3,814 ft
Julesburg	May 7	Oct 6	152 days	3,477 ft
Karval	May 9	Oct 6	149 days	5,075 ft
Kassler	May 8	Oct 3	147 days	5,587 ft
Kim 10sse	Apr 24	Oct 18	175 days	5,257 ft
Kim 15 NNE	May 5	Oct 9	156 days	5,190 ft
Kit Carson	May 10	Oct 1	142 days	4,302 ft
Kit Carson 9nne	May 7	Oct 6	151 days	4,346 ft
Kremmling	Jun 14	Sep 5	80 days	7,460 ft
La Junta	Apr 26	Oct 15	171 days	4,089 ft
La Junta 17 WSW	May 8	Oct 4	148 days	4,386 ft
La Junta 20 S	Apr 27	Oct 14	168 days	4,210 ft
La Junta Muni Airport	Apr 24	Oct 15	173 days	4,194 ft
Lake City	Jun 8	Sep 17	101 days	8,667 ft
Lake City 1nne	Jun 9	Sep 17	99 days	8,714 ft
Lake George 8 SW	Jun 2	Sep 19	108 days	8,550 ft
Lakewood	May 3	Oct 7	155 days	5,640 ft
Lamar	Apr 30	Oct 10	163 days	3,627 ft
Lamar Muni Airport	May 2	Oct 7	157 days	3,704 ft
Las Animas	Apr 29	Oct 12	166 days	3,890 ft
Leadville Lake Co Airport	any month	any month	52 days	9,932 ft
Lemon Dam	May 28	Sep 30	122 days	8,110 ft
Leroy 5 WSW	May 10	Oct 6	147 days	4,467 ft
Limon WSMO	May 21	Sep 26	127 days	5,364 ft
Lindon 5 WNW	May 15	Oct 2	139 days	4,851 ft
Longmont 2 ESE	May 7	Oct 5	151 days	4,950 ft
Loveland 2n	May 10	Oct 1	142 days	5,080 ft
Manassa	May 28	Sep 21	115 days	7,695 ft
Mancos 1sw	Jun 4	Sep 24	111 days	6,897 ft
Marston Fltr Plant	May 2	Oct 11	160 days	5,610 ft
Massadona 3e	May 10	Oct 4	147 days	6,140 ft
Matheson 8 SE	May 12	Oct 2	141 days	5,830 ft
Maybell	Jun 16	Sep 9	83 days	5,944 ft
Meeker	Jun 4	Sep 16	104 days	6,229 ft
Meeker Airport	May 30	Sep 22	117 days	6,390 ft
Meredith	any month	any month	55 days	7,825 ft
Mesa Verde National Park	May 9	Oct 14	156 days	7,142 ft
Monte Vista 2w	Jun 11	Sep 13	92 days	7,695 ft
Montrose #2	Apr 28	Oct 14	167 days	5,789 ft
Montrose 11 ENE	May 20	Oct 1	132 days	8,402 ft
Montrose Regional Airport	May 2	Oct 8	157 days	5,759 ft
Monument	May 14	Oct 1	138 days	7,080 ft
Monument 3s	May 17	Oct 1	136 days	6,821 ft
New Raymer	May 9	Oct 4	146 days	4,783 ft
New Raymer 21 N	May 18	Sep 29	133 days	5,180 ft
Northdale	Jun 3	Sep 25	113 days	6,681 ft
Northglenn	May 2	Oct 11	160 days	5,407 ft
Norwood	May 25	Oct 1	128 days	7,020 ft
Norwood #2	May 21	Oct 1	131 days	7,011 ft
Nunn 7 NNE	May 13	Sep 27	136 days	5,390 ft
Ordway 1 ENE	May 2	Oct 8	159 days	4,312 ft
Ordway 21 N	May 3	Oct 7	155 days	4,767 ft
Ouray	May 17	Oct 1	137 days	7,840 ft
Ouray #2	May 18	Oct 4	139 days	7,718 ft
Palisade	Apr 17	Oct 26	190 days	4,751 ft
Paonia 1sw	May 3	Oct 12	159 days	5,581 ft
Paradox 2n	May 11	Oct 5	146 days	5,447 ft
Parker	May 9	Oct 3	145 days	5,904 ft
Placerville	May 26	Sep 29	125 days	7,383 ft
Pueblo Mem Airport	Apr 30	Oct 9	161 days	4,720 ft
Pueblo Rsvr	Apr 26	Oct 13	166 days	4,861 ft
Ralston Rsvr	May 3	Oct 14	161 days	5,900 ft
Rangely 1e	May 15	Oct 1	136 days	5,277 ft
Ridgway	Jun 11	Sep 13	92 days	7,049 ft
Rifle 3ene	May 23	Sep 25	124 days	5,469 ft
Rifle Garfield Co Airport	May 11	Oct 4	143 days	5,530 ft
Rio Grande Rsvr	Jun 15	Sep 11	85 days	9,492 ft
Rocky Ford 2 SE	May 1	Oct 8	159 days	4,170 ft
Roxborough State Park	May 16	Oct 1	136 days	6,117 ft
Rush 1n	May 9	Oct 4	146 days	6,054 ft
Rustic 9wsw	Jun 5	Sep 16	101 days	7,700 ft
Ruxton Park	Jun 3	Sep 17	102 days	9,060 ft
Rye 1sw	May 5	Oct 10	156 days	7,141 ft
Saguache	May 16	Sep 28	135 days	7,701 ft
Salida	May 29	Sep 20	112 days	7,160 ft
San Luis 1 S	May 31	Sep 23	115 days	7,943 ft
Santa Maria Rsvr	any month	any month	64 days	9,687 ft
Sargents	any month	any month	33 days	8,460 ft
Sedgwick 5 S	May 6	Oct 7	152 days	3,996 ft
Seibert	May 4	Oct 11	158 days	4,706 ft
Shaw 4ene	May 12	Oct 4	143 days	5,000 ft
Sheep Mountain	May 27	Sep 25	119 days	7,744 ft
Sheridan Lake	Apr 27	Oct 15	170 days	4,070 ft
Sheridan Lake 4e	Apr 28	Oct 13	167 days	4,039 ft
Shoshone	May 1	Oct 14	164 days	5,992 ft
Silverton	any month	any month	40 days	9,285 ft
Spicer	any month	any month	53 days	8,385 ft
Springfield Comanche	May 3	Oct 10	158 days	4,383 ft
Steamboat Springs	Jun 9	Sep 12	93 days	6,866 ft
Sterling	Apr 30	Oct 9	161 days	3,974 ft
Stratton	May 6	Oct 9	155 days	4,399 ft
Strontia Springs Dam	May 16	Sep 29	132 days	5,840 ft
Sugarloaf Rsvr	any month	any month	53 days	9,738 ft
Tacony 13 SE	May 5	Oct 6	153 days	4,882 ft
Taylor Park	Jun 20	Sep 8	80 days	9,179 ft
Telluride 4wnw	any month	any month	60 days	8,646 ft
Trinidad	Apr 30	Oct 15	167 days	6,030 ft
Trinidad Lake	May 11	Oct 4	145 days	6,310 ft
Trinidad Perry Stokes Airport	May 4	Oct 9	156 days	5,741 ft
Twin Lakes Rsvr	Jun 16	Sep 10	85 days	9,236 ft
Uravan	Apr 26	Oct 18	174 days	5,021 ft
Vail	Jun 21	Sep 7	77 days	8,304 ft
Vallecito Dam	May 31	Sep 26	119 days	7,644 ft
Vallecito Reservoir	May 18	Oct 11	145 days	7,673 ft
Virginia Dale 7 ENE	May 31	Sep 19	110 days	7,015 ft
WFO Pueblo	Apr 30	Oct 9	162 days	4,653 ft
Walden	any month	any month	31 days	8,056 ft
Walsenburg 1 NW	May 6	Oct 4	149 days	6,292 ft
Walsh 1 W	Apr 30	Oct 14	166 days	3,978 ft
Waterdale	May 12	Oct 1	141 days	5,230 ft
Waverly 1w	Jun 6	Sep 15	100 days	7,603 ft
Westcliffe	Jun 11	Sep 9	89 days	7,873 ft
Wheat Ridge 2	May 5	Oct 5	151 days	5,398 ft
Wild Horse 6n	May 4	Oct 8	155 days	4,654 ft
Williams Fork Dam	Jun 12	Sep 10	89 days	7,618 ft
Woodrow 6nne	May 15	Oct 1	140 days	4,374 ft
Wray	May 7	Oct 6	151 days	3,553 ft
Yampa	Jun 14	Sep 11	89 days	7,857 ft
Yellow Jacket 2w	May 17	Oct 9	145 days	6,933 ft
Yellow Jacket 4ne	May 15	Oct 8	147 days	7,090 ft
Yuma	May 1	Oct 12	164 days	4,134 ft

Sources

NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.

Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.