South Dakota frost dates
Across 166 weather stations in South Dakota, the median last spring frost runs from Apr 26 in Sioux Falls Airport to Jun 1 in Hill City, and the first fall frost from Sep 10 to Oct 13.
South Dakota at a glance
- Weather stations
- 166
- Earliest last frost
- Apr 26 Sioux Falls Airport
- Latest last frost
- Jun 1 Hill City
- Longest season
- 169 days Sioux Falls Airport
- Typical season
- about 145 frost-free days
- Hardiness zones
- Zones 4a to 5b
Frost dates by weather station
| Weather station | Last spring frost | First fall frost | Frost-free days | Zone |
|---|---|---|---|---|
| Aberdeen | May 9 | Sep 26 | 139 | 4a |
| Aberdeen 3 mi E | May 8 | Sep 29 | 144 | 4a |
| Aberdeen 35 mi WNW | May 10 | Sep 30 | 143 | 4b |
| Academy | Apr 30 | Oct 8 | 159 | 5a |
| Alexandria | May 8 | Sep 29 | 143 | 5a |
| Andover | May 6 | Oct 4 | 150 | 4b |
| Antelope Ranger Station | May 19 | Sep 19 | 121 | 4b |
| Ardmore | May 16 | Sep 23 | 128 | 4b |
| Arlington | May 3 | Oct 2 | 151 | 4b |
| Armour | May 3 | Oct 6 | 157 | 5a |
| Astoria | May 6 | Oct 3 | 150 | 4b |
| Bear Ridge | May 17 | Sep 27 | 132 | 5a |
| Belle Fourche | May 10 | Sep 30 | 143 | 5b |
| Belle Fourche 22 mi NNW | May 15 | Sep 24 | 130 | 4b |
| Bison | May 10 | Oct 1 | 144 | 4b |
| Bonesteel | May 3 | Oct 10 | 159 | 5a |
| Bridgewater | Apr 30 | Oct 7 | 161 | 5a |
| Britton | May 13 | Sep 26 | 135 | 4a |
| Brookings | May 6 | Oct 1 | 145 | 4b |
| Buffalo | May 10 | Oct 1 | 141 | 4b |
| Buffalo 13 mi ESE | May 20 | Sep 19 | 120 | 4b |
| Camp Crook | May 17 | Sep 24 | 128 | 4b |
| Canton | May 2 | Oct 2 | 151 | 5a |
| Castlewood | May 10 | Sep 27 | 139 | 4a |
| Castlewood No. 2 | May 6 | Oct 1 | 145 | 4a |
| Cedar Butte | May 6 | Oct 4 | 151 | 5a |
| Centerville | May 2 | Oct 1 | 151 | 5a |
| Chamberlain | May 3 | Oct 7 | 156 | 5a |
| Chamberlain Municipal Airport | May 1 | Oct 7 | 158 | 5a |
| Clark | May 5 | Oct 5 | 153 | 4b |
| Clark No. 2 | May 5 | Oct 5 | 152 | 4b |
| Clear Lake | May 7 | Oct 1 | 146 | 4b |
| Columbia | May 7 | Sep 29 | 145 | 4a |
| Conde | May 6 | Sep 29 | 144 | 4a |
| Cottonwood | May 16 | Sep 26 | 132 | 5a |
| Custer | May 18 | Sep 28 | 129 | 5a |
| Custer County Airport | May 23 | Sep 24 | 122 | 5a |
| De Smet | May 5 | Oct 4 | 151 | 4b |
| Deadwood | May 24 | Sep 25 | 125 | 5a |
| Dupree | May 8 | Oct 1 | 144 | 4b |
| Dupree 15 mi SSE | May 6 | Oct 2 | 148 | 4b |
| Edgemont | May 23 | Sep 20 | 117 | 4b |
| Edgemont 23 mi NNW | May 18 | Sep 27 | 130 | 5a |
| Elm Springs | May 8 | Oct 3 | 146 | 4b |
| Eureka | May 12 | Sep 27 | 137 | 4b |
| Faith | May 6 | Oct 5 | 151 | 4b |
| Faith Municipal Airport | May 7 | Oct 3 | 147 | 4b |
| Faulkton | May 10 | Sep 28 | 139 | 4b |
| Flandreau | May 5 | Oct 1 | 148 | 4b |
| Forestburg | May 9 | Sep 28 | 140 | 4b |
| Fort Meade | May 8 | Oct 3 | 147 | 5a |
| Fort Pierre | May 10 | Sep 27 | 138 | 4b |
| Gann Valley 3 mi NNE | May 7 | Oct 1 | 146 | 4b |
| Gann Valley 4 mi NW | May 6 | Oct 1 | 148 | 4b |
| Gettysburg | May 7 | Oct 2 | 147 | 4b |
| Glad Valley | May 11 | Sep 30 | 140 | 4b |
| Gregory | May 6 | Oct 3 | 149 | 5a |
| Harrington | May 11 | Oct 1 | 143 | 5a |
| Harrold | May 17 | Sep 24 | 129 | 4b |
| Hereford | May 8 | Oct 3 | 147 | 5a |
| Highmore 1 mi W | May 12 | Oct 1 | 142 | 4b |
| Highmore 23 mi N | May 14 | Sep 29 | 138 | 4b |
| Hill City | Jun 1 | Sep 10 | 102 | 5a |
| Hoover | May 19 | Sep 21 | 122 | 4b |
| Hot Springs | May 16 | Sep 27 | 133 | 5a |
| Howard | May 5 | Oct 2 | 149 | 4b |
| Huron Regional Airport | May 6 | Oct 2 | 146 | 4b |
| Interior | May 5 | Oct 7 | 152 | 5a |
| Ipswich | May 8 | Sep 29 | 143 | 4b |
| Johnson Siding | May 20 | Sep 25 | 126 | 5a |
| Kennebec | May 12 | Sep 28 | 137 | 5a |
| Kirley | May 6 | Oct 4 | 148 | 4b |
| Kyle | May 11 | Oct 1 | 139 | 5a |
| Ladner | May 13 | Sep 27 | 135 | 4b |
| Lake Sharpe Prj | May 6 | Oct 5 | 152 | 4b |
| Lead | May 18 | Sep 29 | 133 | 5a |
| Lemmon | May 10 | Sep 30 | 142 | 4b |
| Leola | May 9 | Sep 28 | 141 | 4b |
| Lodgepole | May 30 | Sep 11 | 103 | 4b |
| Longvalley | May 9 | Oct 1 | 143 | 5a |
| Ludlow | May 16 | Sep 26 | 131 | 4b |
| Madison | May 5 | Sep 30 | 148 | 4b |
| Manderson | May 9 | Oct 4 | 147 | 5a |
| Martin | May 13 | Oct 2 | 141 | 5a |
| Martin 8 mi E | May 14 | Oct 1 | 139 | 5a |
| Maurine | May 13 | Sep 28 | 136 | 4b |
| McIntosh | May 9 | Sep 30 | 143 | 4b |
| McLaughlin | May 12 | Sep 28 | 137 | 4b |
| Mellette | May 11 | Sep 27 | 137 | 4a |
| Menno | May 1 | Oct 4 | 156 | 5a |
| Midland | May 12 | Sep 28 | 138 | 4b |
| Milbank | May 5 | Oct 2 | 150 | 4b |
| Milbank 4 mi NW | May 2 | Oct 4 | 153 | 4b |
| Milesville | May 8 | Oct 2 | 147 | 4b |
| Miller | May 3 | Oct 3 | 152 | 4b |
| Mission | May 9 | Oct 1 | 146 | 5a |
| Mission 14 mi S | May 11 | Oct 2 | 145 | 5a |
| Mission Ridge | May 6 | Oct 7 | 152 | 4b |
| Mitchell | Apr 27 | Oct 11 | 167 | 5a |
| Mitchell 2 mi N | May 2 | Oct 6 | 156 | 5a |
| Mitchell Municipal Airport | Apr 30 | Oct 5 | 159 | 5a |
| Mobridge | May 3 | Oct 8 | 157 | 4b |
| Mobridge Municipal Airport | May 5 | Oct 4 | 150 | 4b |
| Montrose | May 3 | Oct 4 | 153 | 5a |
| Mount Rushmore National Memorial | May 15 | Oct 1 | 138 | 5a |
| Murdo | May 3 | Oct 9 | 158 | 5a |
| Newell | May 8 | Oct 1 | 144 | 4b |
| Oahe Dam | May 6 | Oct 5 | 152 | 4b |
| Oelrichs | May 15 | Sep 30 | 137 | 5a |
| Oglala | May 7 | Oct 4 | 149 | 5a |
| Onida | May 8 | Oct 2 | 147 | 4b |
| Oral | May 15 | Sep 27 | 133 | 5a |
| Pactola Dam | May 28 | Sep 18 | 112 | 5a |
| Philip Airport | May 11 | Sep 30 | 141 | 5a |
| Pickstown | Apr 30 | Oct 13 | 165 | 5b |
| Pickstown 4 mi SSW | Apr 27 | Oct 13 | 168 | 5a |
| Pierre | May 6 | Oct 7 | 154 | 5a |
| Pierre Regional Airport | May 6 | Oct 3 | 148 | 4b |
| Pine Ridge Airport | May 16 | Sep 27 | 132 | 5a |
| Plainview | May 15 | Sep 27 | 134 | 4b |
| Pollock | May 8 | Sep 30 | 143 | 4a |
| Porcupine | May 17 | Sep 25 | 130 | 5a |
| Presho | May 12 | Sep 29 | 140 | 5a |
| Ralph | May 18 | Sep 23 | 126 | 4b |
| Rapid City | May 3 | Oct 8 | 157 | 5b |
| Rapid City 4 mi NW | May 10 | Oct 5 | 147 | 5b |
| Rapid City Regional Airport | May 12 | Oct 1 | 139 | 5a |
| Rauville | May 7 | Sep 28 | 143 | 4b |
| Red Owl | May 16 | Sep 26 | 131 | 4b |
| Redfield | May 8 | Oct 1 | 145 | 4b |
| Redig | May 15 | Sep 24 | 131 | 4b |
| Roscoe | May 7 | Oct 3 | 148 | 4b |
| Roy Lake | May 2 | Oct 9 | 160 | 4a |
| Salem | May 7 | Sep 29 | 144 | 5a |
| Selby | May 8 | Oct 1 | 145 | 4b |
| Shadehill Reservoir | May 16 | Sep 24 | 131 | 4b |
| Sioux Falls | May 1 | Oct 6 | 157 | 5a |
| Sioux Falls 14 mi NNE | May 1 | Oct 4 | 155 | 5a |
| Sioux Falls Airport | Apr 26 | Oct 13 | 169 | 5a |
| Sisseton | May 4 | Oct 3 | 151 | 4b |
| Sisseton Municipal Airport | May 3 | Sep 30 | 149 | 4b |
| Spearfish | May 12 | Oct 2 | 143 | 5b |
| Stephan | May 10 | Sep 29 | 140 | 4b |
| Summit | May 14 | Sep 28 | 136 | 4a |
| Timber Lake | May 10 | Sep 30 | 141 | 4b |
| Turton | May 7 | Oct 3 | 149 | 4b |
| Tyndall | May 1 | Oct 7 | 158 | 5a |
| Vermillion | May 3 | Oct 3 | 153 | 5a |
| Victor | May 4 | Oct 3 | 152 | 4b |
| Wagner | Apr 29 | Oct 9 | 164 | 5a |
| Wasta | May 10 | Oct 1 | 141 | 5a |
| Watertown | May 3 | Oct 4 | 153 | 4b |
| Watertown Regional Airport | May 7 | Sep 30 | 145 | 4b |
| Waubay National Wild Life | May 1 | Oct 12 | 164 | 4b |
| Webster | May 4 | Oct 6 | 156 | 4b |
| Wentworth | May 2 | Oct 5 | 156 | 4b |
| Wessington Springs | May 2 | Oct 8 | 157 | 5a |
| White Lake | May 3 | Oct 5 | 153 | 5a |
| Wilmot | May 5 | Oct 1 | 149 | 4b |
| Wind Cave | May 15 | Sep 29 | 133 | 5b |
| Winfred | May 6 | Oct 3 | 151 | 4b |
| Winner | May 1 | Oct 9 | 159 | 5a |
| Winner Wiley Field | May 1 | Oct 10 | 162 | 5a |
| Wood | May 10 | Oct 1 | 143 | 5a |
| Yankton | Apr 27 | Oct 11 | 164 | 5a |
| Zeona | May 11 | Sep 28 | 137 | 4b |
Median dates from NOAA 1991–2020 climate normals. How to read them.