Frost dates in Allison, IA
The average last spring frost in Allison is around April 30 and the first fall frost is around October 6. That gives Allison an average growing season of about 159 days.
Last spring frost
| Early (10% chance after) | April 15 |
|---|---|
| Average (50%) | April 30 |
| Late (90%) | May 15 |
First fall frost
| Early (10%) | September 23 |
|---|---|
| Average (50%) | October 6 |
| Late (90% chance before) | October 23 |