Frost dates in Belle Plaine, IA
The average last spring frost in Belle Plaine is around April 30 and the first fall frost is around October 5. That gives Belle Plaine an average growing season of about 158 days.
Last spring frost
| Early (10% chance after) | April 17 |
|---|---|
| Average (50%) | April 30 |
| Late (90%) | May 17 |
First fall frost
| Early (10%) | September 21 |
|---|---|
| Average (50%) | October 5 |
| Late (90% chance before) | October 20 |