Frost dates in Mount Vernon, IA
The average last spring frost in Mount Vernon is around April 26 and the first fall frost is around October 9. That gives Mount Vernon an average growing season of about 166 days.
Last spring frost
| Early (10% chance after) | April 13 |
|---|---|
| Average (50%) | April 26 |
| Late (90%) | May 14 |
First fall frost
| Early (10%) | September 26 |
|---|---|
| Average (50%) | October 9 |
| Late (90% chance before) | October 23 |