Frost dates in Superior, IA
The average last spring frost in Superior is around April 27 and the first fall frost is around October 9. That gives Superior an average growing season of about 165 days.
Last spring frost
| Early (10% chance after) | April 9 |
|---|---|
| Average (50%) | April 27 |
| Late (90%) | May 15 |
First fall frost
| Early (10%) | September 27 |
|---|---|
| Average (50%) | October 9 |
| Late (90% chance before) | October 27 |