Frost dates in Merrill, IA
The average last spring frost in Merrill is around May 3 and the first fall frost is around October 3. That gives Merrill an average growing season of about 153 days.
Last spring frost
| Early (10% chance after) | April 17 |
|---|---|
| Average (50%) | May 3 |
| Late (90%) | May 16 |
First fall frost
| Early (10%) | September 18 |
|---|---|
| Average (50%) | October 3 |
| Late (90% chance before) | October 16 |