South Dakota frost dates
Median last spring frost and first fall frost for 363 places in South Dakota. Last frost ranges from Apr 26 in Chancellor to Jun 1 in Hill City.
Largest cities
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Sioux Falls | Apr 26 | Oct 13 | 170 d | 5a |
| Rapid City | May 3 | Oct 8 | 158 d | 5a |
| Aberdeen | May 9 | Sep 26 | 140 d | 4a |
| Brookings | May 6 | Oct 1 | 148 d | 4b |
| Watertown | May 7 | Sep 30 | 146 d | 4b |
| Mitchell | May 2 | Oct 6 | 157 d | 5a |
| Yankton | Apr 27 | Oct 11 | 167 d | 5a |
| Pierre | May 6 | Oct 3 | 150 d | 4b |
| Huron | May 6 | Oct 2 | 149 d | 4b |
| Spearfish | May 12 | Oct 2 | 143 d | 5b |
| Vermillion | May 3 | Oct 3 | 153 d | 5a |
| Brandon | May 1 | Oct 6 | 158 d | 5a |
| Box Elder | May 12 | Oct 1 | 142 d | 5a |
| Madison | May 5 | Sep 30 | 148 d | 4b |
| Sturgis | May 8 | Oct 3 | 148 d | 5a |
| Belle Fourche | May 10 | Sep 30 | 143 d | 4b |
| Harrisburg | May 1 | Oct 6 | 158 d | 5a |
| Tea | Apr 26 | Oct 13 | 170 d | 5a |
| Dell Rapids | May 1 | Oct 4 | 156 d | 4b |
| Hot Springs | May 16 | Sep 27 | 134 d | 5a |
| Mobridge | May 5 | Oct 4 | 152 d | 4b |
| Canton | May 2 | Oct 2 | 153 d | 5a |
| Pine Ridge | May 16 | Sep 27 | 134 d | 5a |
| Milbank | May 5 | Oct 2 | 150 d | 4b |
| Hartford | Apr 26 | Oct 13 | 170 d | 5a |
| Lead | May 18 | Sep 29 | 134 d | 5a |
| Winner | May 1 | Oct 9 | 161 d | 5a |
| North Sioux City | Apr 29 | Oct 7 | 161 d | 5a |
| Sisseton | May 4 | Oct 3 | 152 d | 4b |
| Chamberlain | May 1 | Oct 7 | 159 d | 5a |
| Redfield | May 8 | Oct 1 | 146 d | 4b |
| Flandreau | May 5 | Oct 1 | 149 d | 4b |
| Lennox | May 2 | Oct 2 | 153 d | 5a |
| Fort Pierre | May 6 | Oct 3 | 150 d | 4b |
| Elk Point | May 3 | Oct 3 | 153 d | 5a |
| Beresford | May 2 | Oct 1 | 152 d | 5a |
| Springfield | May 1 | Oct 7 | 159 d | 5a |
| Custer | May 15 | Sep 29 | 137 d | 5a |
| Volga | May 6 | Oct 1 | 148 d | 4b |
| Webster | May 4 | Oct 6 | 155 d | 4b |