Frost dates in Portage, MI
The average last spring frost in Portage is around April 28 and the first fall frost is around October 17. That gives Portage an average growing season of about 172 days.
Last spring frost
| Early (10% chance after) | April 19 |
|---|---|
| Average (50%) | April 28 |
| Late (90%) | May 13 |
First fall frost
| Early (10%) | October 6 |
|---|---|
| Average (50%) | October 17 |
| Late (90% chance before) | October 27 |