Frost dates in Alpena, MI
The average last spring frost in Alpena is around May 3 and the first fall frost is around October 16. That gives Alpena an average growing season of about 166 days.
Last spring frost
| Early (10% chance after) | April 19 |
|---|---|
| Average (50%) | May 3 |
| Late (90%) | May 19 |
First fall frost
| Early (10%) | September 29 |
|---|---|
| Average (50%) | October 16 |
| Late (90% chance before) | November 2 |