Frost dates in Castana, IA
The average last spring frost in Castana is around April 29 and the first fall frost is around October 7. That gives Castana an average growing season of about 161 days.
Last spring frost
| Early (10% chance after) | April 10 |
|---|---|
| Average (50%) | April 29 |
| Late (90%) | May 13 |
First fall frost
| Early (10%) | September 27 |
|---|---|
| Average (50%) | October 7 |
| Late (90% chance before) | October 28 |