Frost dates in Ironwood, MI
The average last spring frost in Ironwood is around May 18 and the first fall frost is around October 10. That gives Ironwood an average growing season of about 145 days.
Last spring frost
| Early (10% chance after) | April 30 |
|---|---|
| Average (50%) | May 18 |
| Late (90%) | May 31 |
First fall frost
| Early (10%) | September 22 |
|---|---|
| Average (50%) | October 10 |
| Late (90% chance before) | October 15 |