Frost dates in Garnavillo, IA
The average last spring frost in Garnavillo is around April 20 and the first fall frost is around October 13. That gives Garnavillo an average growing season of about 176 days.
Last spring frost
| Early (10% chance after) | April 9 |
|---|---|
| Average (50%) | April 20 |
| Late (90%) | May 5 |
First fall frost
| Early (10%) | October 1 |
|---|---|
| Average (50%) | October 13 |
| Late (90% chance before) | November 1 |