Frost dates in St. Clair, MI
The average last spring frost in St. Clair is around April 27 and the first fall frost is around October 22. That gives St. Clair an average growing season of about 178 days.
Last spring frost
| Early (10% chance after) | April 13 |
|---|---|
| Average (50%) | April 27 |
| Late (90%) | May 16 |
First fall frost
| Early (10%) | October 4 |
|---|---|
| Average (50%) | October 22 |
| Late (90% chance before) | November 10 |