Last frost dates in Colorado
210 NOAA weather stations in Colorado have thirty years of frost records. The median station sees its last 32 °F night around May 11; across the state that ranges from Apr 14 to Jun 21, so pick the station nearest you rather than a state-wide figure.
| Plan sowing from this date | ||||||
|---|---|---|---|---|---|---|
| GRAND JUNCTION WFO | Apr 14 | Apr 28 | Apr 1 | Oct 23 | 190 | Plan sowing from this date → |
| PALISADE | Apr 17 | May 3 | Mar 27 | Oct 26 | 190 | Plan sowing from this date → |
| GATEWAY 1ENE | Apr 20 | May 5 | Apr 1 | Oct 21 | 182 | Plan sowing from this date → |
| GRAND JUNCTION 6ESE | Apr 23 | May 9 | Apr 6 | Oct 20 | 179 | Plan sowing from this date → |
| JOHN MARTIN DAM | Apr 24 | May 8 | Apr 9 | Oct 15 | 172 | Plan sowing from this date → |
| KIM 10SSE | Apr 24 | May 6 | Apr 10 | Oct 18 | 175 | Plan sowing from this date → |
| LA JUNTA MUNI AP | Apr 24 | May 6 | Apr 10 | Oct 15 | 173 | Plan sowing from this date → |
| COLORADO NM | Apr 26 | May 15 | Apr 9 | Oct 16 | 172 | Plan sowing from this date → |
| LA JUNTA | Apr 26 | May 9 | Apr 10 | Oct 15 | 171 | Plan sowing from this date → |
| PUEBLO RSVR | Apr 26 | May 8 | Apr 13 | Oct 13 | 166 | Plan sowing from this date → |
| URAVAN | Apr 26 | May 8 | Apr 10 | Oct 18 | 174 | Plan sowing from this date → |
| FRUITA | Apr 27 | May 7 | Apr 17 | Oct 11 | 164 | Plan sowing from this date → |
| LA JUNTA 20 S | Apr 27 | May 11 | Apr 13 | Oct 14 | 168 | Plan sowing from this date → |
| SHERIDAN LAKE | Apr 27 | May 10 | Apr 13 | Oct 15 | 170 | Plan sowing from this date → |
| GRAND JUNCTION WALKER FLD | Apr 28 | May 14 | Apr 11 | Oct 16 | 171 | Plan sowing from this date → |
| MONTROSE #2 | Apr 28 | May 12 | Apr 13 | Oct 14 | 167 | Plan sowing from this date → |
| SHERIDAN LAKE 4E | Apr 28 | May 12 | Apr 13 | Oct 13 | 167 | Plan sowing from this date → |
| CAMPO 7 S | Apr 29 | May 12 | Apr 14 | Oct 13 | 166 | Plan sowing from this date → |
| LAS ANIMAS | Apr 29 | May 11 | Apr 15 | Oct 12 | 166 | Plan sowing from this date → |
| CHERAW 1 N | Apr 30 | May 13 | Apr 19 | Oct 10 | 163 | Plan sowing from this date → |
| DENVER WATER DEPT | Apr 30 | May 13 | Apr 15 | Oct 12 | 165 | Plan sowing from this date → |
| EADS | Apr 30 | May 12 | Apr 15 | Oct 13 | 165 | Plan sowing from this date → |
| LAMAR | Apr 30 | May 13 | Apr 17 | Oct 10 | 163 | Plan sowing from this date → |
| PUEBLO MEM AP | Apr 30 | May 12 | Apr 18 | Oct 9 | 161 | Plan sowing from this date → |
| STERLING | Apr 30 | May 12 | Apr 16 | Oct 9 | 161 | Plan sowing from this date → |
| TRINIDAD | Apr 30 | May 11 | Apr 16 | Oct 15 | 167 | Plan sowing from this date → |
| WALSH 1 W | Apr 30 | May 12 | Apr 17 | Oct 14 | 166 | Plan sowing from this date → |
| WFO PUEBLO | Apr 30 | May 12 | Apr 16 | Oct 9 | 162 | Plan sowing from this date → |
| CHEYENNE WELLS 2NE | May 1 | May 17 | Apr 18 | Oct 14 | 165 | Plan sowing from this date → |
| DELTA 3E | May 1 | May 14 | Apr 19 | Oct 7 | 159 | Plan sowing from this date → |
| HOLLY | May 1 | May 14 | Apr 18 | Oct 12 | 163 | Plan sowing from this date → |
| ROCKY FORD 2 SE | May 1 | May 14 | Apr 20 | Oct 8 | 159 | Plan sowing from this date → |
| SHOSHONE | May 1 | May 14 | Apr 19 | Oct 14 | 164 | Plan sowing from this date → |
| YUMA | May 1 | May 13 | Apr 16 | Oct 12 | 164 | Plan sowing from this date → |
| BURLINGTON CARSON AP | May 2 | May 16 | Apr 19 | Oct 10 | 160 | Plan sowing from this date → |
| DINOSAUR 2 E | May 2 | May 17 | Apr 18 | Oct 14 | 161 | Plan sowing from this date → |
| FT COLLINS | May 2 | May 14 | Apr 18 | Oct 7 | 157 | Plan sowing from this date → |
| GREELEY UNC | May 2 | May 14 | Apr 17 | Oct 8 | 159 | Plan sowing from this date → |
| LAMAR MUNI AP | May 2 | May 17 | Apr 19 | Oct 7 | 157 | Plan sowing from this date → |
| MARSTON FLTR PLT | May 2 | May 17 | Apr 20 | Oct 11 | 160 | Plan sowing from this date → |
| MONTROSE RGNL AP | May 2 | May 17 | Apr 19 | Oct 8 | 157 | Plan sowing from this date → |
| NORTHGLENN | May 2 | May 14 | Apr 18 | Oct 11 | 160 | Plan sowing from this date → |
| ORDWAY 1 ENE | May 2 | May 14 | Apr 20 | Oct 8 | 159 | Plan sowing from this date → |
| BRIGHTON 3 SE | May 3 | May 16 | Apr 22 | Oct 7 | 155 | Plan sowing from this date → |
| CEDAREDGE 3E | May 3 | May 21 | Apr 22 | Oct 9 | 156 | Plan sowing from this date → |
| COLORADO SPRINGS MUNI AP | May 3 | May 15 | Apr 22 | Oct 8 | 158 | Plan sowing from this date → |
| FT COLLINS 4 E | May 3 | May 15 | Apr 21 | Oct 6 | 154 | Plan sowing from this date → |
| JOES | May 3 | May 15 | Apr 21 | Oct 9 | 158 | Plan sowing from this date → |
| LAKEWOOD | May 3 | May 18 | Apr 19 | Oct 7 | 155 | Plan sowing from this date → |
| ORDWAY 21 N | May 3 | May 16 | Apr 21 | Oct 7 | 155 | Plan sowing from this date → |
| PAONIA 1SW | May 3 | May 18 | Apr 22 | Oct 12 | 159 | Plan sowing from this date → |
| RALSTON RSVR | May 3 | May 17 | Apr 21 | Oct 14 | 161 | Plan sowing from this date → |
| SPRINGFIELD COMANCHE | May 3 | May 17 | Apr 20 | Oct 10 | 158 | Plan sowing from this date → |
| CANON CITY | May 4 | May 18 | Apr 24 | Oct 7 | 153 | Plan sowing from this date → |
| DENVER-STAPLETON | May 4 | May 16 | Apr 20 | Oct 8 | 156 | Plan sowing from this date → |
| FLEMING 3SW | May 4 | May 16 | Apr 21 | Oct 11 | 157 | Plan sowing from this date → |
| IDALIA | May 4 | May 17 | Apr 21 | Oct 9 | 155 | Plan sowing from this date → |
| SEIBERT | May 4 | May 17 | Apr 22 | Oct 11 | 158 | Plan sowing from this date → |
| TRINIDAD PERRY STOKES AP | May 4 | May 19 | Apr 20 | Oct 9 | 156 | Plan sowing from this date → |
| WILD HORSE 6N | May 4 | May 17 | Apr 21 | Oct 8 | 155 | Plan sowing from this date → |
| ARAPAHOE 12S | May 5 | May 19 | Apr 22 | Oct 9 | 156 | Plan sowing from this date → |
| BONNY DAM 2NE | May 5 | May 19 | Apr 21 | Oct 10 | 155 | Plan sowing from this date → |
| DENVER CENTENNIAL AP | May 5 | May 17 | Apr 24 | Oct 8 | 154 | Plan sowing from this date → |
| DENVER INTL AP | May 5 | May 19 | Apr 23 | Oct 9 | 156 | Plan sowing from this date → |
| FLAGLER 1S | May 5 | May 20 | Apr 22 | Oct 8 | 155 | Plan sowing from this date → |
| KIM 15 NNE | May 5 | May 19 | Apr 23 | Oct 9 | 156 | Plan sowing from this date → |
| RYE 1SW | May 5 | May 20 | Apr 22 | Oct 10 | 156 | Plan sowing from this date → |
| TACONY 13 SE | May 5 | May 16 | Apr 23 | Oct 6 | 153 | Plan sowing from this date → |
| WHEAT RIDGE 2 | May 5 | May 18 | Apr 24 | Oct 5 | 151 | Plan sowing from this date → |
| AKRON WASHINGTON CO AP | May 6 | May 19 | Apr 24 | Oct 8 | 155 | Plan sowing from this date → |
| BOULDER | May 6 | May 18 | Apr 24 | Oct 5 | 151 | Plan sowing from this date → |
| BURLINGTON | May 6 | May 19 | Apr 23 | Oct 9 | 155 | Plan sowing from this date → |
| CORTEZ 8 SE | May 6 | May 27 | Apr 22 | Oct 14 | 158 | Plan sowing from this date → |
| ELLICOTT 7S | May 6 | May 28 | Apr 21 | Oct 3 | 149 | Plan sowing from this date → |
| FT MORGAN | May 6 | May 19 | Apr 23 | Oct 6 | 153 | Plan sowing from this date → |
| SEDGWICK 5 S | May 6 | May 18 | Apr 24 | Oct 7 | 152 | Plan sowing from this date → |
| STRATTON | May 6 | May 17 | Apr 24 | Oct 9 | 155 | Plan sowing from this date → |
| WALSENBURG 1 NW | May 6 | May 20 | Apr 24 | Oct 4 | 149 | Plan sowing from this date → |
| CHERRY CREEK DAM | May 7 | May 21 | Apr 26 | Oct 8 | 152 | Plan sowing from this date → |
| JULESBURG | May 7 | May 18 | Apr 23 | Oct 6 | 152 | Plan sowing from this date → |
| KIT CARSON 9NNE | May 7 | May 24 | Apr 23 | Oct 6 | 151 | Plan sowing from this date → |
| LONGMONT 2 ESE | May 7 | May 22 | Apr 24 | Oct 5 | 151 | Plan sowing from this date → |
| WRAY | May 7 | May 19 | Apr 25 | Oct 6 | 151 | Plan sowing from this date → |
| AKRON 4 E | May 8 | May 22 | Apr 27 | Oct 6 | 149 | Plan sowing from this date → |
| GENOA | May 8 | May 22 | Apr 25 | Oct 10 | 155 | Plan sowing from this date → |
| KASSLER | May 8 | May 22 | Apr 27 | Oct 3 | 147 | Plan sowing from this date → |
| LA JUNTA 17 WSW | May 8 | May 25 | Apr 26 | Oct 4 | 148 | Plan sowing from this date → |
| ARAPAHOE 14N | May 9 | May 22 | Apr 27 | Oct 7 | 150 | Plan sowing from this date → |
| CASTLE ROCK | May 9 | May 24 | Apr 30 | Oct 2 | 143 | Plan sowing from this date → |
| CUMBRE VISTA - COLORADO SPGS 1 | May 9 | May 20 | Apr 28 | Oct 6 | 150 | Plan sowing from this date → |
| KARVAL | May 9 | May 23 | Apr 28 | Oct 6 | 149 | Plan sowing from this date → |
| MESA VERDE NP | May 9 | May 27 | Apr 24 | Oct 14 | 156 | Plan sowing from this date → |
| NEW RAYMER | May 9 | May 22 | Apr 29 | Oct 4 | 146 | Plan sowing from this date → |
| PARKER | May 9 | May 23 | Apr 27 | Oct 3 | 145 | Plan sowing from this date → |
| RUSH 1N | May 9 | May 22 | Apr 29 | Oct 4 | 146 | Plan sowing from this date → |
| HUGO 1 NW | May 10 | May 25 | Apr 30 | Oct 2 | 143 | Plan sowing from this date → |
| KIT CARSON | May 10 | May 24 | Apr 30 | Oct 1 | 142 | Plan sowing from this date → |
| LEROY 5 WSW | May 10 | May 22 | Apr 28 | Oct 6 | 147 | Plan sowing from this date → |
| LOVELAND 2N | May 10 | May 22 | Apr 30 | Oct 1 | 142 | Plan sowing from this date → |
| MASSADONA 3E | May 10 | May 27 | Apr 28 | Oct 4 | 147 | Plan sowing from this date → |
| BLACK FOREST 6WNW | May 11 | May 25 | Apr 30 | Oct 6 | 147 | Plan sowing from this date → |
| CROOK | May 11 | May 23 | May 1 | Oct 4 | 145 | Plan sowing from this date → |
| DOVE CREEK | May 11 | May 25 | Apr 29 | Oct 12 | 152 | Plan sowing from this date → |
| HOLYOKE | May 11 | May 23 | Apr 30 | Oct 3 | 144 | Plan sowing from this date → |
| PARADOX 2N | May 11 | May 29 | Apr 29 | Oct 5 | 146 | Plan sowing from this date → |
| RIFLE GARFIELD CO AP | May 11 | May 27 | Apr 28 | Oct 4 | 143 | Plan sowing from this date → |
| TRINIDAD LAKE | May 11 | May 25 | Apr 29 | Oct 4 | 145 | Plan sowing from this date → |
| BRIGGSDALE | May 12 | May 25 | May 2 | Sep 28 | 135 | Plan sowing from this date → |
| CORTEZ | May 12 | May 31 | Apr 30 | Oct 7 | 147 | Plan sowing from this date → |
| DINOSAUR NM | May 12 | Jun 1 | Apr 28 | Oct 5 | 146 | Plan sowing from this date → |
| MATHESON 8 SE | May 12 | May 26 | May 1 | Oct 2 | 141 | Plan sowing from this date → |
| SHAW 4ENE | May 12 | May 26 | Apr 30 | Oct 4 | 143 | Plan sowing from this date → |
| WATERDALE | May 12 | May 30 | Apr 30 | Oct 1 | 141 | Plan sowing from this date → |
| BYERS 5 ENE | May 13 | May 30 | Apr 30 | Oct 2 | 142 | Plan sowing from this date → |
| GLENWOOD SPGS #2 | May 13 | May 30 | Apr 30 | Oct 3 | 142 | Plan sowing from this date → |
| NUNN 7 NNE | May 13 | May 27 | May 2 | Sep 27 | 136 | Plan sowing from this date → |
| MONUMENT | May 14 | May 31 | May 2 | Oct 1 | 138 | Plan sowing from this date → |
| LINDON 5 WNW | May 15 | May 30 | May 2 | Oct 2 | 139 | Plan sowing from this date → |
| RANGELY 1E | May 15 | Jun 2 | May 2 | Oct 1 | 136 | Plan sowing from this date → |
| WOODROW 6NNE | May 15 | May 28 | May 3 | Oct 1 | 140 | Plan sowing from this date → |
| YELLOW JACKET 4NE | May 15 | May 31 | Apr 30 | Oct 8 | 147 | Plan sowing from this date → |
| ELIZABETH 2NW | May 16 | Jun 1 | May 4 | Oct 2 | 137 | Plan sowing from this date → |
| ROXBOROUGH SP | May 16 | Jun 1 | May 2 | Oct 1 | 136 | Plan sowing from this date → |
| SAGUACHE | May 16 | May 31 | May 5 | Sep 28 | 135 | Plan sowing from this date → |
| STRONTIA SPRINGS DAM | May 16 | Jun 6 | May 3 | Sep 29 | 132 | Plan sowing from this date → |
| CHEESMAN | May 17 | Jun 6 | May 3 | Oct 1 | 135 | Plan sowing from this date → |
| COLLBRAN 1WSW | May 17 | Jun 3 | May 2 | Sep 30 | 136 | Plan sowing from this date → |
| MONUMENT 3S | May 17 | May 30 | May 5 | Oct 1 | 136 | Plan sowing from this date → |
| OURAY | May 17 | Jun 3 | May 1 | Oct 1 | 137 | Plan sowing from this date → |
| YELLOW JACKET 2W | May 17 | Jun 4 | Apr 29 | Oct 9 | 145 | Plan sowing from this date → |
| NEW RAYMER 21 N | May 18 | Jun 2 | May 5 | Sep 29 | 133 | Plan sowing from this date → |
| OURAY #2 | May 18 | May 31 | May 4 | Oct 4 | 139 | Plan sowing from this date → |
| VALLECITO RESERVOIR | May 18 | Jun 6 | May 3 | Oct 11 | 145 | Plan sowing from this date → |
| GUFFEY 9SE | May 19 | May 31 | May 7 | Oct 2 | 134 | Plan sowing from this date → |
| MONTROSE 11 ENE | May 20 | Jun 4 | May 4 | Oct 1 | 132 | Plan sowing from this date → |
| BUCKHORN MTN 1 E | May 21 | Jun 4 | May 9 | Sep 29 | 128 | Plan sowing from this date → |
| DURANGO | May 21 | Jun 7 | May 7 | Oct 2 | 134 | Plan sowing from this date → |
| GLADE PARK 17W | May 21 | Jun 9 | May 6 | Sep 26 | 126 | Plan sowing from this date → |
| GREAT SAND DUNES NP & PRESERVE | May 21 | Jun 3 | May 9 | Oct 1 | 131 | Plan sowing from this date → |
| LIMON WSMO | May 21 | Jun 4 | May 7 | Sep 26 | 127 | Plan sowing from this date → |
| NORWOOD #2 | May 21 | Jun 5 | May 7 | Oct 1 | 131 | Plan sowing from this date → |
| BLACK CANYON OF THE GUNNISON | May 23 | Jun 9 | May 5 | Oct 1 | 130 | Plan sowing from this date → |
| DEL NORTE 3ENE | May 23 | Jun 8 | May 11 | Sep 25 | 123 | Plan sowing from this date → |
| EVERGREEN | May 23 | Jun 10 | May 9 | Sep 22 | 118 | Plan sowing from this date → |
| IGNACIO 6ESE | May 23 | Jun 7 | May 9 | Sep 29 | 128 | Plan sowing from this date → |
| RIFLE 3ENE | May 23 | Jun 6 | May 9 | Sep 25 | 124 | Plan sowing from this date → |
| CENTER 4 SSW | May 24 | Jun 8 | May 9 | Sep 24 | 120 | Plan sowing from this date → |
| GROSS RSVR | May 24 | Jun 10 | May 11 | Sep 23 | 120 | Plan sowing from this date → |
| ALTENBERN | May 25 | Jun 13 | May 10 | Sep 25 | 120 | Plan sowing from this date → |
| BLANCA 4 NW | May 25 | Jun 12 | May 11 | Sep 22 | 117 | Plan sowing from this date → |
| NORWOOD | May 25 | Jun 13 | May 7 | Oct 1 | 128 | Plan sowing from this date → |
| CRESTONE 2 SE | May 26 | Jun 9 | May 14 | Sep 26 | 120 | Plan sowing from this date → |
| CRIPPLE CREEK 3NNW | May 26 | Jun 9 | May 15 | Sep 26 | 121 | Plan sowing from this date → |
| PLACERVILLE | May 26 | Jun 6 | May 14 | Sep 29 | 125 | Plan sowing from this date → |
| BUENA VISTA 2S | May 27 | Jun 11 | May 13 | Sep 23 | 116 | Plan sowing from this date → |
| CORTEZ MONTEZUMA CO AP | May 27 | Jun 11 | May 9 | Sep 28 | 125 | Plan sowing from this date → |
| SHEEP MTN | May 27 | Jun 10 | May 12 | Sep 25 | 119 | Plan sowing from this date → |
| LEMON DAM | May 28 | Jun 10 | May 13 | Sep 30 | 122 | Plan sowing from this date → |
| MANASSA | May 28 | Jun 11 | May 13 | Sep 21 | 115 | Plan sowing from this date → |
| CRAIG 4SW | May 29 | Jun 13 | May 13 | Sep 20 | 113 | Plan sowing from this date → |
| EASTONVILLE 2 NNW | May 29 | Jun 13 | May 15 | Sep 21 | 114 | Plan sowing from this date → |
| SALIDA | May 29 | Jun 12 | May 15 | Sep 20 | 112 | Plan sowing from this date → |
| ALAMOSA 1E | May 30 | Jun 13 | May 17 | Sep 17 | 108 | Plan sowing from this date → |
| ESTES PARK 3 SSE | May 30 | Jun 14 | May 15 | Sep 17 | 109 | Plan sowing from this date → |
| GEORGETOWN | May 30 | Jun 14 | May 17 | Sep 19 | 112 | Plan sowing from this date → |
| MEEKER AP | May 30 | Jun 13 | May 14 | Sep 22 | 117 | Plan sowing from this date → |
| ASPEN PITKIN CO AP | May 31 | Jun 14 | May 16 | Sep 23 | 114 | Plan sowing from this date → |
| SAN LUIS 1 S | May 31 | Jun 14 | May 14 | Sep 23 | 115 | Plan sowing from this date → |
| VALLECITO DAM | May 31 | Jun 14 | May 16 | Sep 26 | 119 | Plan sowing from this date → |
| VIRGINIA DALE 7 ENE | May 31 | Jun 15 | May 17 | Sep 19 | 110 | Plan sowing from this date → |
| DIVIDE 4NW | Jun 1 | Jun 17 | May 22 | Sep 21 | 110 | Plan sowing from this date → |
| DURANGO LA PLATA CO AP | Jun 1 | Jun 15 | May 17 | Sep 27 | 116 | Plan sowing from this date → |
| FT LEWIS | Jun 1 | Jun 19 | May 16 | Sep 27 | 116 | Plan sowing from this date → |
| HAYDEN | Jun 1 | Jun 16 | May 15 | Sep 20 | 109 | Plan sowing from this date → |
| ASPEN 1SW | Jun 2 | Jun 17 | May 17 | Sep 23 | 113 | Plan sowing from this date → |
| LAKE GEORGE 8 SW | Jun 2 | Jun 17 | May 19 | Sep 19 | 108 | Plan sowing from this date → |
| NORTHDALE | Jun 3 | Jun 19 | May 19 | Sep 25 | 113 | Plan sowing from this date → |
| RUXTON PARK | Jun 3 | Jun 23 | May 21 | Sep 17 | 102 | Plan sowing from this date → |
| MANCOS 1SW | Jun 4 | Jun 19 | May 20 | Sep 24 | 111 | Plan sowing from this date → |
| MEEKER | Jun 4 | Jun 23 | May 21 | Sep 16 | 104 | Plan sowing from this date → |
| COAL CREEK CANYON | Jun 5 | Jun 19 | May 23 | Sep 16 | 103 | Plan sowing from this date → |
| RUSTIC 9WSW | Jun 5 | Jun 20 | May 24 | Sep 16 | 101 | Plan sowing from this date → |
| CABIN CREEK | Jun 6 | Jun 21 | May 25 | Sep 19 | 103 | Plan sowing from this date → |
| CRAIG MOFFAT CO AP | Jun 6 | Jun 24 | May 21 | Sep 12 | 96 | Plan sowing from this date → |
| GREEN MT DAM | Jun 6 | Jun 23 | May 24 | Sep 14 | 98 | Plan sowing from this date → |
| WAVERLY 1W | Jun 6 | Jun 22 | May 24 | Sep 15 | 100 | Plan sowing from this date → |
| ALAMOSA SAN LUIS AP | Jun 7 | Jun 24 | May 24 | Sep 15 | 98 | Plan sowing from this date → |
| LAKE CITY | Jun 8 | Jun 24 | May 26 | Sep 17 | 101 | Plan sowing from this date → |
| BLUE MESA LAKE | Jun 9 | Jun 24 | May 26 | Sep 16 | 96 | Plan sowing from this date → |
| LAKE CITY 1NNE | Jun 9 | Jun 22 | May 27 | Sep 17 | 99 | Plan sowing from this date → |
| STEAMBOAT SPRINGS | Jun 9 | Jun 24 | May 25 | Sep 12 | 93 | Plan sowing from this date → |
| MONTE VISTA 2W | Jun 11 | Jun 25 | Jun 1 | Sep 13 | 92 | Plan sowing from this date → |
| RIDGWAY | Jun 11 | Jun 30 | May 27 | Sep 13 | 92 | Plan sowing from this date → |
| WESTCLIFFE | Jun 11 | Jun 28 | May 29 | Sep 9 | 89 | Plan sowing from this date → |
| WILLIAMS FORK DAM | Jun 12 | Jun 25 | May 31 | Sep 10 | 89 | Plan sowing from this date → |
| GRAND LAKE 6 SSW | Jun 13 | Jun 28 | Jun 1 | Sep 7 | 84 | Plan sowing from this date → |
| ALLENSPARK 3NW | Jun 14 | Jun 28 | May 24 | Sep 12 | 92 | Plan sowing from this date → |
| KREMMLING | Jun 14 | Jun 30 | Jun 1 | Sep 5 | 80 | Plan sowing from this date → |
| YAMPA | Jun 14 | Jun 28 | Jun 1 | Sep 11 | 89 | Plan sowing from this date → |
| GRANT | Jun 15 | Jun 30 | Jun 1 | Sep 9 | 84 | Plan sowing from this date → |
| RIO GRANDE RSVR | Jun 15 | Jun 30 | Jun 2 | Sep 11 | 85 | Plan sowing from this date → |
| BAILEY | Jun 16 | Jul 1 | Jun 2 | Sep 8 | 84 | Plan sowing from this date → |
| FAIRPLAY S PARK RD | Jun 16 | Jun 30 | Jun 2 | Sep 9 | 83 | Plan sowing from this date → |
| MAYBELL | Jun 16 | Jul 1 | May 31 | Sep 9 | 83 | Plan sowing from this date → |
| TWIN LAKES RSVR | Jun 16 | Jun 29 | Jun 3 | Sep 10 | 85 | Plan sowing from this date → |
| CIMARRON | Jun 20 | Jul 7 | Jun 4 | Sep 10 | 81 | Plan sowing from this date → |
| TAYLOR PARK | Jun 20 | Jul 2 | Jun 7 | Sep 8 | 80 | Plan sowing from this date → |
| BOULDER 14 W | Jun 21 | Jul 4 | Jun 7 | Sep 2 | 71 | Plan sowing from this date → |
| COCHETOPA CREEK | Jun 21 | Jul 7 | Jun 7 | Sep 5 | 74 | Plan sowing from this date → |
| VAIL | Jun 21 | Jul 9 | Jun 8 | Sep 7 | 77 | Plan sowing from this date → |
How to read the three dates
Average is the date by which, in half of the years between 1991 and 2020, the last 32 °F night had already happened. Safe is later: only one year in ten saw a frost after it, which is the date to transplant tomatoes and peppers, both killed by a single frost. Early is the risky end, with a frost after it in nine years out of ten.
Every figure is for the weather station, not for your garden. A valley bottom, a north slope or a spot near a lake can run a week or two either way. Cities are warmer than the countryside around them.
Where the numbers come from
The dates are NOAA's U.S. Climate Normals for 1991 to 2020, computed by the National Centers for Environmental Information for every station with thirty years of daily minimum temperatures. ZIP codes are matched to the nearest such station within 150 km using U.S. Census Bureau ZIP Code Tabulation Area centroids. Stations that never see a frost, such as much of south Florida, report no date and are left out.