Last frost date in Alpena, Michigan
May 5
Average last frost in spring. In an early year (1 in 10) it's over by April 21; in a late year (1 in 10) it comes after May 21.
October 17
Average first frost in fall. 1 year in 10 it comes by September 30.
Source: NOAA U.S. Climate Normals 1991–2020, station Alpena Wwtp (USW00014814), 1.2 miles from Alpena, elevation 590 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 21 | May 5 | May 21 |
| First frost in fall | Sept 30 | Oct 17 | Nov 1 |
Frost-free days in an average year: 163
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 17 | Oct 4 |
| Frost (32°F) | Every year | May 5 | Oct 17 |
| Hard freeze (28°F) | Every year | Apr 23 | Oct 31 |
Nights at 32°F or colder in an average year: 149
What to plant now in Alpena
- Spring planting calendar for an average last frost around April 30 Alpena: May 5
- Fall planting calendar for an average first frost around October 20 Alpena: October 17
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 Michigan
- Bay City 105 mi · last frost Apr 27
- Sault Ste. Marie 107 mi · last frost May 9
- Midland 107 mi · last frost Apr 29
- Traverse City 108 mi · last frost May 12
- Cadillac 113 mi · last frost May 19
Updated