Frost dates in Clear Lake, IA
The average last spring frost in Clear Lake is around May 3 and the first fall frost is around October 2. That gives Clear Lake an average growing season of about 152 days.
Last spring frost
| Early (10% chance after) | April 20 |
|---|---|
| Average (50%) | May 3 |
| Late (90%) | May 17 |
First fall frost
| Early (10%) | September 21 |
|---|---|
| Average (50%) | October 2 |
| Late (90% chance before) | October 15 |