Frost dates in Altamont, IL
The average last spring frost in Altamont is around April 18 and the first fall frost is around October 18. That gives Altamont an average growing season of about 183 days.
Last spring frost
| Early (10% chance after) | April 6 |
|---|---|
| Average (50%) | April 18 |
| Late (90%) | May 6 |
First fall frost
| Early (10%) | October 1 |
|---|---|
| Average (50%) | October 18 |
| Late (90% chance before) | November 3 |