Last frost date in Hermantown, Minnesota
May 18
Average last frost in spring. In an early year (1 in 10) it's over by May 2; in a late year (1 in 10) it comes after June 3.
October 1
Average first frost in fall. 1 year in 10 it comes by September 19.
Source: NOAA U.S. Climate Normals 1991–2020, station Duluth NWS (USC00212250), 2.8 miles from Hermantown, elevation 1,433 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | May 2 | May 18 | June 3 |
| First frost in fall | Sept 19 | Oct 1 | Oct 14 |
Frost-free days in an average year: 135
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | June 1 | Sept 22 |
| Frost (32°F) | Every year | May 18 | Oct 1 |
| Hard freeze (28°F) | Every year | May 4 | Oct 12 |
Nights at 32°F or colder in an average year: 184
What to plant now in Hermantown
- Spring planting calendar for an average last frost around May 20 Hermantown: May 18
- Fall planting calendar for an average first frost around September 30 Hermantown: October 1
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 Minnesota
- Duluth 5 mi · last frost May 14
- Cloquet 13 mi · last frost May 26
- Hibbing 53 mi · last frost June 5
- Grand Rapids 68 mi · last frost May 17
- North Branch 96 mi · last frost May 19