Frost dates in Unionville, IA
The average last spring frost in Unionville is around April 18 and the first fall frost is around October 15. That gives Unionville an average growing season of about 180 days.
Last spring frost
| Early (10% chance after) | April 5 |
|---|---|
| Average (50%) | April 18 |
| Late (90%) | May 4 |
First fall frost
| Early (10%) | October 1 |
|---|---|
| Average (50%) | October 15 |
| Late (90% chance before) | October 30 |