Frost dates in South Dakota
Across 166 NOAA stations in South Dakota, the average last spring frost ranges from April 26 at Sioux Falls Wfo Airport to June 1 at Hill City.
| Aberdeen | May 9 | September 26 | 139 |
| Aberdeen 3 E | May 8 | September 29 | 144 |
| Aberdeen 35 Wnw | May 10 | September 30 | 143 |
| Academy 2Ne | April 30 | October 8 | 159 |
| Alexandria | May 8 | September 29 | 143 |
| Andover #2 | May 6 | October 4 | 150 |
| Antelope Rs | May 19 | September 19 | 121 |
| Ardmore 1 Nw | May 16 | September 23 | 128 |
| Arlington 1 W | May 3 | October 2 | 151 |
| Armour | May 3 | October 6 | 157 |
| Astoria 4S | May 6 | October 3 | 150 |
| Bear Ridge | May 17 | September 27 | 132 |
| Belle Fourche | May 10 | September 30 | 143 |
| Belle Fourche 22 Nnw | May 15 | September 24 | 130 |
| Bison | May 10 | October 1 | 144 |
| Bonesteel | May 3 | October 10 | 159 |
| Bridgewater | April 30 | October 7 | 161 |
| Britton | May 13 | September 26 | 135 |
| Brookings 2 Ne | May 6 | October 1 | 145 |
| Buffalo 13 Ese | May 20 | September 19 | 120 |
| Buffalo Asos | May 10 | October 1 | 141 |
| Camp Crook | May 17 | September 24 | 128 |
| Canton | May 2 | October 2 | 151 |
| Castlewood | May 10 | September 27 | 139 |
| Castlewood #2 | May 6 | October 1 | 145 |
| Cedar Butte | May 6 | October 4 | 151 |
| Centerville 6 Se | May 2 | October 1 | 151 |
| Chamberlain 5 S | May 3 | October 7 | 156 |
| Chamberlain Muni Airport | May 1 | October 7 | 158 |
| Clark | May 5 | October 5 | 153 |
| Clark No2 | May 5 | October 5 | 152 |
| Clear Lake | May 7 | October 1 | 146 |
| Columbia 8 N | May 7 | September 29 | 145 |
| Conde | May 6 | September 29 | 144 |
| Cottonwood 2 E | May 16 | September 26 | 132 |
| Custer | May 18 | September 28 | 129 |
| Custer Co Airport | May 23 | September 24 | 122 |
| De Smet | May 5 | October 4 | 151 |
| Deadwood | May 24 | September 25 | 125 |
| Dupree | May 8 | October 1 | 144 |
| Dupree 15 Sse | May 6 | October 2 | 148 |
| Edgemont | May 23 | September 20 | 117 |
| Edgemont 23 Nnw | May 18 | September 27 | 130 |
| Elm Springs 3 Ese | May 8 | October 3 | 146 |
| Eureka | May 12 | September 27 | 137 |
| Faith | May 6 | October 5 | 151 |
| Faith Muni Airport | May 7 | October 3 | 147 |
| Faulkton 1 Nw | May 10 | September 28 | 139 |
| Flandreau | May 5 | October 1 | 148 |
| Forestburg 4 Nne | May 9 | September 28 | 140 |
| Ft Meade | May 8 | October 3 | 147 |
| Ft Pierre 17 Wsw | May 10 | September 27 | 138 |
| Gann Valley 3 Nne | May 7 | October 1 | 146 |
| Gann Valley 4Nw | May 6 | October 1 | 148 |
| Gettysburg | May 7 | October 2 | 147 |
| Glad Valley 2 W | May 11 | September 30 | 140 |
| Gregory | May 6 | October 3 | 149 |
| Harrington | May 11 | October 1 | 143 |
| Harrold 12 Ssw | May 17 | September 24 | 129 |
| Hereford 12 Sw | May 8 | October 3 | 147 |
| Highmore 1 W | May 12 | October 1 | 142 |
| Highmore 23 N | May 14 | September 29 | 138 |
| Hill City | June 1 | September 10 | 102 |
| Hoover | May 19 | September 21 | 122 |
| Hot Springs | May 16 | September 27 | 133 |
| Howard | May 5 | October 2 | 149 |
| Huron Rgnl Airport | May 6 | October 2 | 146 |
| Interior 3 Ne | May 5 | October 7 | 152 |
| Ipswich | May 8 | September 29 | 143 |
| Johnson Siding | May 20 | September 25 | 126 |
| Kennebec | May 12 | September 28 | 137 |
| Kirley 6 N | May 6 | October 4 | 148 |
| Kyle 2 E | May 11 | October 1 | 139 |
| Ladner 9Sw | May 13 | September 27 | 135 |
| Lake Sharpe Prj | May 6 | October 5 | 152 |
| Lead | May 18 | September 29 | 133 |
| Lemmon | May 10 | September 30 | 142 |
| Leola | May 9 | September 28 | 141 |
| Lodgepole 5Sw | May 30 | September 11 | 103 |
| Longvalley | May 9 | October 1 | 143 |
| Ludlow 3 Sse | May 16 | September 26 | 131 |
| Madison 2Se | May 5 | September 30 | 148 |
| Manderson 3 Ne | May 9 | October 4 | 147 |
| Martin | May 13 | October 2 | 141 |
| Martin 8 E | May 14 | October 1 | 139 |
| Maurine 12Sw | May 13 | September 28 | 136 |
| Mc Intosh 6 Se | May 9 | September 30 | 143 |
| Mc Laughlin | May 12 | September 28 | 137 |
| Mellette 4 W | May 11 | September 27 | 137 |
| Menno | May 1 | October 4 | 156 |
| Midland | May 12 | September 28 | 138 |
| Milbank | May 5 | October 2 | 150 |
| Milbank 4 Nw | May 2 | October 4 | 153 |
| Milesville 5 Ne | May 8 | October 2 | 147 |
| Miller | May 3 | October 3 | 152 |
| Mission | May 9 | October 1 | 146 |
| Mission 14 S | May 11 | October 2 | 145 |
| Mission Ridge 5Nw | May 6 | October 7 | 152 |
| Mitchell | April 27 | October 11 | 167 |
| Mitchell 2 N | May 2 | October 6 | 156 |
| Mitchell Muni Airport | April 30 | October 5 | 159 |
| Mobridge 2Nnw | May 3 | October 8 | 157 |
| Mobridge Muni Airport | May 5 | October 4 | 150 |
| Montrose 8N | May 3 | October 4 | 153 |
| Mt Rushmore Nmem | May 15 | October 1 | 138 |
| Murdo | May 3 | October 9 | 158 |
| Newell | May 8 | October 1 | 144 |
| Oahe Dam | May 6 | October 5 | 152 |
| Oelrichs | May 15 | September 30 | 137 |
| Oglala 1S | May 7 | October 4 | 149 |
| Onida 4 Nw | May 8 | October 2 | 147 |
| Oral | May 15 | September 27 | 133 |
| Pactola Dam | May 28 | September 18 | 112 |
| Philip Airport | May 11 | September 30 | 141 |
| Pickstown | April 30 | October 13 | 165 |
| Pickstown 4Ssw | April 27 | October 13 | 168 |
| Pierre 24 S | May 6 | October 7 | 154 |
| Pierre Rgnl Airport | May 6 | October 3 | 148 |
| Pine Ridge Airport | May 16 | September 27 | 132 |
| Plainview 6 Ssw | May 15 | September 27 | 134 |
| Pollock | May 8 | September 30 | 143 |
| Porcupine 11 N | May 17 | September 25 | 130 |
| Presho 7 Nw | May 12 | September 29 | 140 |
| Ralph 1 N | May 18 | September 23 | 126 |
| Rapid City 4Nw | May 10 | October 5 | 147 |
| Rapid City Rgnl Airport | May 12 | October 1 | 139 |
| Rapid City Wfo | May 3 | October 8 | 157 |
| Rauville 2 W | May 7 | September 28 | 143 |
| Red Owl | May 16 | September 26 | 131 |
| Redfield | May 8 | October 1 | 145 |
| Redig 11 Ne | May 15 | September 24 | 131 |
| Roscoe | May 7 | October 3 | 148 |
| Roy Lake | May 2 | October 9 | 160 |
| Salem 5Ne | May 7 | September 29 | 144 |
| Selby | May 8 | October 1 | 145 |
| Shadehill Rsvr | May 16 | September 24 | 131 |
| Sioux Falls | May 1 | October 6 | 157 |
| Sioux Falls 14 Nne | May 1 | October 4 | 155 |
| Sioux Falls Wfo Airport | April 26 | October 13 | 169 |
| Sisseton | May 4 | October 3 | 151 |
| Sisseton Muni Airport | May 3 | September 30 | 149 |
| Spearfish | May 12 | October 2 | 143 |
| Stephan 2 Nw | May 10 | September 29 | 140 |
| Summit 1 W | May 14 | September 28 | 136 |
| Timber Lake | May 10 | September 30 | 141 |
| Turton | May 7 | October 3 | 149 |
| Tyndall | May 1 | October 7 | 158 |
| Vermillion 2 Se | May 3 | October 3 | 153 |
| Victor 4 N | May 4 | October 3 | 152 |
| Wagner | April 29 | October 9 | 164 |
| Wasta | May 10 | October 1 | 141 |
| Watertown 2 S | May 3 | October 4 | 153 |
| Watertown Rgnl Airport | May 7 | September 30 | 145 |
| Waubay Natl Wild Life | May 1 | October 12 | 164 |
| Webster | May 4 | October 6 | 156 |
| Wentworth 2.5 Wnw | May 2 | October 5 | 156 |
| Wessington Springs | May 2 | October 8 | 157 |
| White Lake | May 3 | October 5 | 153 |
| Wilmot | May 5 | October 1 | 149 |
| Wind Cave | May 15 | September 29 | 133 |
| Winfred 2S | May 6 | October 3 | 151 |
| Winner | May 1 | October 9 | 159 |
| Winner Wiley Fld | May 1 | October 10 | 162 |
| Wood | May 10 | October 1 | 143 |
| Yankton 2 E | April 27 | October 11 | 164 |
| Zeona 10 Ssw | May 11 | September 28 | 137 |
Sources
- U.S. Annual/Seasonal Climate Normals, 1991 to 2020 (freeze probability dates by station), NOAA National Centers for Environmental Information, checked 1 November 2026
- Annual/Seasonal Normals 1991 to 2020 documentation, NOAA National Centers for Environmental Information, checked 1 November 2026
- 2024 Gazetteer Files, ZIP Code Tabulation Areas, US Census Bureau, checked 1 November 2026