Frost dates in Greenfield, IA
The average last spring frost in Greenfield is around April 27 and the first fall frost is around October 9. That gives Greenfield an average growing season of about 165 days.
Last spring frost
| Early (10% chance after) | April 9 |
|---|---|
| Average (50%) | April 27 |
| Late (90%) | May 12 |
First fall frost
| Early (10%) | September 27 |
|---|---|
| Average (50%) | October 9 |
| Late (90% chance before) | October 28 |