Frost dates in Cromwell, IA
The average last spring frost in Cromwell is around April 28 and the first fall frost is around October 9. That gives Cromwell an average growing season of about 164 days.
Last spring frost
| Early (10% chance after) | April 12 |
|---|---|
| Average (50%) | April 28 |
| Late (90%) | May 13 |
First fall frost
| Early (10%) | September 27 |
|---|---|
| Average (50%) | October 9 |
| Late (90% chance before) | October 25 |