Last frost date in Hartford, Wisconsin
May 8
Average last frost in spring. In an early year (1 in 10) it's over by April 24; in a late year (1 in 10) it comes after May 24.
October 3
Average first frost in fall. 1 year in 10 it comes by September 20.
Source: NOAA U.S. Climate Normals 1991–2020, station Hartford Wwtp (USC00473453), 1.8 miles from Hartford, elevation 961 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 24 | May 8 | May 24 |
| First frost in fall | Sept 20 | Oct 3 | Oct 16 |
Frost-free days in an average year: 148
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 20 | Sept 25 |
| Frost (32°F) | Every year | May 8 | Oct 3 |
| Hard freeze (28°F) | Every year | Apr 27 | Oct 15 |
Nights at 32°F or colder in an average year: 159
What to plant now in Hartford
- Spring planting calendar for an average last frost around May 10 Hartford: May 8
- Fall planting calendar for an average first frost around September 30 Hartford: October 3
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 Bend 12 mi · last frost May 1
- Sussex 15 mi · last frost Apr 30
- Oconomowoc 16 mi · last frost Apr 30
- Menomonee Falls 17 mi · last frost May 6
- Cedarburg 20 mi · last frost Apr 23