Frost dates in West Union, IA
The average last spring frost in West Union is around May 10 and the first fall frost is around September 29. That gives West Union an average growing season of about 142 days.
Last spring frost
| Early (10% chance after) | April 22 |
|---|---|
| Average (50%) | May 10 |
| Late (90%) | May 27 |
First fall frost
| Early (10%) | September 17 |
|---|---|
| Average (50%) | September 29 |
| Late (90% chance before) | October 15 |