Frost dates in Alton, IN
The average last spring frost in Alton is around April 10 and the first fall frost is around November 6. That gives Alton an average growing season of about 210 days.
Last spring frost
| Early (10% chance after) | March 13 |
|---|---|
| Average (50%) | April 10 |
| Late (90%) | April 28 |
First fall frost
| Early (10%) | October 16 |
|---|---|
| Average (50%) | November 6 |
| Late (90% chance before) | December 2 |