Last frost date in Sun Prairie, Wisconsin
May 1
Average last frost in spring. In an early year (1 in 10) it's over by April 16; in a late year (1 in 10) it comes after May 16.
October 10
Average first frost in fall. 1 year in 10 it comes by September 26.
Source: NOAA U.S. Climate Normals 1991–2020, station Madison Dane Rgnl AP (USW00014837), 6.1 miles from Sun Prairie, elevation 866 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Waunakee, so its frost dates are the same as Sun Prairie's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 16 | May 1 | May 16 |
| First frost in fall | Sept 26 | Oct 10 | Oct 24 |
Frost-free days in an average year: 160
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 13 | Sept 29 |
| Frost (32°F) | Every year | May 1 | Oct 10 |
| Hard freeze (28°F) | Every year | Apr 20 | Oct 22 |
Nights at 32°F or colder in an average year: 147
What to plant now in Sun Prairie
- Spring planting calendar for an average last frost around April 30 Sun Prairie: May 1
- Fall planting calendar for an average first frost around October 10 Sun Prairie: October 10
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 Wisconsin
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