Frost Dates & Planting Calendars in South Dakota
Typical last spring frost, first fall frost, and growing-season length for 20 cities in South Dakota, based on NOAA 1991–2020 climate normals. Click a city for its full frost-date summary, monthly temperature chart, and 42-crop planting calendar.
| City | Last Spring Frost (typical) | First Fall Frost (typical) | Growing Season | USDA Zone |
|---|---|---|---|---|
| Sioux Falls | May 1 | October 6 | 157 days | 5a |
| Rapid City | May 3 | October 8 | 157 days | 5b |
| Aberdeen | May 8 | September 29 | 144 days | 4a |
| Brookings | May 6 | October 1 | 145 days | 4b |
| Watertown | May 7 | September 30 | 145 days | 4b |
| Mitchell | May 2 | October 6 | 156 days | 5a |
| Yankton | April 27 | October 11 | 164 days | 5a |
| Pierre | May 6 | October 3 | 148 days | 4b |
| Huron | May 6 | October 2 | 146 days | 4b |
| Spearfish | May 12 | October 2 | 143 days | 5a |
| Vermillion | May 3 | October 3 | 153 days | 5a |
| Brandon | May 1 | October 6 | 157 days | 5a |
| Box Elder | May 12 | October 1 | 139 days | 5a |
| Rapid Valley | May 3 | October 8 | 157 days | 5a |
| Ellsworth Air Force Base | May 12 | October 1 | 139 days | 5b |
| Madison | May 5 | September 30 | 148 days | 4b |
| Sturgis | May 8 | October 3 | 147 days | 5a |
| Belle Fourche | May 10 | September 30 | 143 days | 4b |
| Harrisburg | May 2 | October 2 | 151 days | 5a |
| Tea | April 26 | October 13 | 169 days | 5a |