Frost dates in Petersburg, MI
The average last spring frost in Petersburg is around April 27 and the first fall frost is around October 21. That gives Petersburg an average growing season of about 177 days.
Last spring frost
| Early (10% chance after) | April 16 |
|---|---|
| Average (50%) | April 27 |
| Late (90%) | May 6 |
First fall frost
| Early (10%) | October 7 |
|---|---|
| Average (50%) | October 21 |
| Late (90% chance before) | October 31 |