Last frost date in Oconomowoc, 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 17.
October 12
Average first frost in fall. 1 year in 10 it comes by September 29.
Source: NOAA U.S. Climate Normals 1991–2020, station Oconomowoc Wwtp (USC00476200), 0.4 miles from Oconomowoc, elevation 858 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 16 | Apr 30 | May 17 |
| First frost in fall | Sept 29 | Oct 12 | 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 12 | Oct 2 |
| Frost (32°F) | Every year | Apr 30 | Oct 12 |
| Hard freeze (28°F) | Every year | Apr 19 | Oct 24 |
Nights at 32°F or colder in an average year: 146
What to plant now in Oconomowoc
- Spring planting calendar for an average last frost around April 30 Oconomowoc: April 30
- Fall planting calendar for an average first frost around October 10 Oconomowoc: October 12
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
- Watertown 13 mi · last frost Apr 28
- Sussex 14 mi · last frost Apr 30
- Waukesha 14 mi · last frost May 1
- Hartford 16 mi · last frost May 8
- Brookfield 19 mi · last frost Apr 30
Updated