Last frost date in Box Elder, South Dakota
May 12
Average last frost in spring. In an early year (1 in 10) it's over by May 1; in a late year (1 in 10) it comes after May 26.
October 1
Average first frost in fall. 1 year in 10 it comes by September 16.
Source: NOAA U.S. Climate Normals 1991–2020, station Rapid City Rgnl AP (USW00024090), 4.9 miles from Box Elder, elevation 3,160 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | May 1 | May 12 | May 26 |
| First frost in fall | Sept 16 | Oct 1 | Oct 14 |
Frost-free days in an average year: 139
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 22 | Sept 21 |
| Frost (32°F) | Every year | May 12 | Oct 1 |
| Hard freeze (28°F) | Every year | May 2 | Oct 9 |
Nights at 32°F or colder in an average year: 174
What to plant now in Box Elder
- Spring planting calendar for an average last frost around May 10 Box Elder: May 12
- Fall planting calendar for an average first frost around September 30 Box Elder: October 1
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in South Dakota
- Rapid City 7 mi · last frost May 3
- Spearfish 45 mi · last frost May 12
- Pierre 138 mi · last frost May 6
- Huron 242 mi · last frost May 6
- Aberdeen 245 mi · last frost May 8