Frost dates in Port Sanilac, MI
The average last spring frost in Port Sanilac is around May 5 and the first fall frost is around October 26. That gives Port Sanilac an average growing season of about 174 days.
Last spring frost
| Early (10% chance after) | April 23 |
|---|---|
| Average (50%) | May 5 |
| Late (90%) | May 18 |
First fall frost
| Early (10%) | October 8 |
|---|---|
| Average (50%) | October 26 |
| Late (90% chance before) | November 3 |