Frost dates in Ireton, IA
The average last spring frost in Ireton is around May 3 and the first fall frost is around September 28. That gives Ireton an average growing season of about 148 days.
Last spring frost
| Early (10% chance after) | April 21 |
|---|---|
| Average (50%) | May 3 |
| Late (90%) | May 15 |
First fall frost
| Early (10%) | September 16 |
|---|---|
| Average (50%) | September 28 |
| Late (90% chance before) | October 15 |