Frost dates in Spirit Lake, IA
The average last spring frost in Spirit Lake is around April 27 and the first fall frost is around October 9. That gives Spirit Lake 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 |