Frost dates in Ortonville, MI
The average last spring frost in Ortonville is around May 3 and the first fall frost is around October 17. That gives Ortonville an average growing season of about 167 days.
Last spring frost
| Early (10% chance after) | April 27 |
|---|---|
| Average (50%) | May 3 |
| Late (90%) | May 18 |
First fall frost
| Early (10%) | October 3 |
|---|---|
| Average (50%) | October 17 |
| Late (90% chance before) | October 26 |