Frost dates in Bonaparte, IA
The average last spring frost in Bonaparte is around April 24 and the first fall frost is around October 11. That gives Bonaparte an average growing season of about 170 days.
Last spring frost
| Early (10% chance after) | April 11 |
|---|---|
| Average (50%) | April 24 |
| Late (90%) | May 9 |
First fall frost
| Early (10%) | September 24 |
|---|---|
| Average (50%) | October 11 |
| Late (90% chance before) | October 28 |