Frost dates in West Branch, IA
The average last spring frost in West Branch is around April 24 and the first fall frost is around October 11. That gives West Branch an average growing season of about 170 days.
Last spring frost
| Early (10% chance after) | April 8 |
|---|---|
| Average (50%) | April 24 |
| Late (90%) | May 9 |
First fall frost
| Early (10%) | September 26 |
|---|---|
| Average (50%) | October 11 |
| Late (90% chance before) | October 26 |