Last frost date in Rapid City, South Dakota
May 3
Average last frost in spring. In an early year (1 in 10) it's over by April 20; in a late year (1 in 10) it comes after May 17.
October 8
Average first frost in fall. 1 year in 10 it comes by September 26.
Source: NOAA U.S. Climate Normals 1991–2020, station Rapid City WFO (USC00396948), 0.4 miles from Rapid City, elevation 3,379 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 20 | May 3 | May 17 |
| First frost in fall | Sept 26 | Oct 8 | Oct 23 |
Frost-free days in an average year: 157
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 15 | Oct 1 |
| Frost (32°F) | Every year | May 3 | Oct 8 |
| Hard freeze (28°F) | Every year | Apr 22 | Oct 18 |
Nights at 32°F or colder in an average year: 144
What to plant now in Rapid City
- Spring planting calendar for an average last frost around April 30 Rapid City: May 3
- Fall planting calendar for an average first frost around October 10 Rapid City: October 8
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
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