Frost dates in Diagonal, IA
The average last spring frost in Diagonal is around April 25 and the first fall frost is around October 10. That gives Diagonal an average growing season of about 168 days.
Last spring frost
| Early (10% chance after) | April 13 |
|---|---|
| Average (50%) | April 25 |
| Late (90%) | May 12 |
First fall frost
| Early (10%) | September 24 |
|---|---|
| Average (50%) | October 10 |
| Late (90% chance before) | October 28 |