Last frost date in Waukesha, Wisconsin
May 1
Average last frost in spring. In an early year (1 in 10) it's over by April 18; in a late year (1 in 10) it comes after May 18.
October 13
Average first frost in fall. 1 year in 10 it comes by September 29.
Source: NOAA U.S. Climate Normals 1991–2020, station Waukesha Wwtp (USC00478937), 0.3 miles from Waukesha, elevation 789 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Hartland, so its frost dates are the same as Waukesha's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 18 | May 1 | May 18 |
| First frost in fall | Sept 29 | Oct 13 | Oct 25 |
Frost-free days in an average year: 162
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 13 | Oct 2 |
| Frost (32°F) | Every year | May 1 | Oct 13 |
| Hard freeze (28°F) | Every year | Apr 19 | Oct 23 |
Nights at 32°F or colder in an average year: 143
What to plant now in Waukesha
- Spring planting calendar for an average last frost around April 30 Waukesha: May 1
- Fall planting calendar for an average first frost around October 10 Waukesha: October 13
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
- New Berlin 6 mi · last frost May 3
- Brookfield 7 mi · last frost Apr 30
- Sussex 9 mi · last frost Apr 30
- West Allis 11 mi · last frost Apr 26
- Menomonee Falls 12 mi · last frost May 6
Updated