Frost dates in Marion, IA
The average last spring frost in Marion is around April 26 and the first fall frost is around October 9. That gives Marion 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 |