Frost dates in Bethalto, IL
The average last spring frost in Bethalto is around April 5 and the first fall frost is around November 7. That gives Bethalto an average growing season of about 216 days.
Last spring frost
| Early (10% chance after) | March 22 |
|---|---|
| Average (50%) | April 5 |
| Late (90%) | April 16 |
First fall frost
| Early (10%) | October 20 |
|---|---|
| Average (50%) | November 7 |
| Late (90% chance before) | November 24 |