Frost dates in Unionville, MI
The average last spring frost in Unionville is around May 18 and the first fall frost is around September 29. That gives Unionville an average growing season of about 134 days.
Last spring frost
| Early (10% chance after) | April 30 |
|---|---|
| Average (50%) | May 18 |
| Late (90%) | June 3 |
First fall frost
| Early (10%) | September 11 |
|---|---|
| Average (50%) | September 29 |
| Late (90% chance before) | October 17 |