Frost dates in Irondale, MO
The average last spring frost in Irondale is around April 15 and the first fall frost is around October 23. That gives Irondale an average growing season of about 191 days.
Last spring frost
| Early (10% chance after) | March 27 |
|---|---|
| Average (50%) | April 15 |
| Late (90%) | May 10 |
First fall frost
| Early (10%) | September 21 |
|---|---|
| Average (50%) | October 23 |
| Late (90% chance before) | November 11 |