Frost dates in Posen, MI
The average last spring frost in Posen is around May 22 and the first fall frost is around September 30. That gives Posen an average growing season of about 131 days.
Last spring frost
| Early (10% chance after) | May 13 |
|---|---|
| Average (50%) | May 22 |
| Late (90%) | May 31 |
First fall frost
| Early (10%) | September 21 |
|---|---|
| Average (50%) | September 30 |
| Late (90% chance before) | October 8 |