Frost dates in Ironton, WI
The average last spring frost in Ironton is around May 10 and the first fall frost is around October 3. That gives Ironton an average growing season of about 146 days.
Last spring frost
| Early (10% chance after) | April 24 |
|---|---|
| Average (50%) | May 10 |
| Late (90%) | May 26 |
First fall frost
| Early (10%) | September 20 |
|---|---|
| Average (50%) | October 3 |
| Late (90% chance before) | October 14 |