Last frost date in Brookfield, Wisconsin
April 30
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 15.
October 14
Average first frost in fall. 1 year in 10 it comes by September 28.
Source: NOAA U.S. Climate Normals 1991–2020, station Brookfield Wwtp (USC00471062), 3.1 miles from Brookfield, elevation 830 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Pewaukee, so its frost dates are the same as Brookfield's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 16 | Apr 30 | May 15 |
| First frost in fall | Sept 28 | Oct 14 | Oct 27 |
Frost-free days in an average year: 164
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 10 | Oct 3 |
| Frost (32°F) | Every year | Apr 30 | Oct 14 |
| Hard freeze (28°F) | Every year | Apr 19 | Oct 25 |
Nights at 32°F or colder in an average year: 149
What to plant now in Brookfield
- Spring planting calendar for an average last frost around April 30 Brookfield: April 30
- Fall planting calendar for an average first frost around October 10 Brookfield: October 14
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
- West Allis 6 mi · last frost Apr 26
- New Berlin 6 mi · last frost May 3
- Menomonee Falls 7 mi · last frost May 6
- Sussex 7 mi · last frost Apr 30
- Waukesha 7 mi · last frost May 1
Updated