Frost dates in St. Johns, IL
The average last spring frost in St. Johns is around April 11 and the first fall frost is around October 19. That gives St. Johns an average growing season of about 191 days.
Last spring frost
| Early (10% chance after) | March 27 |
|---|---|
| Average (50%) | April 11 |
| Late (90%) | April 24 |
First fall frost
| Early (10%) | October 3 |
|---|---|
| Average (50%) | October 19 |
| Late (90% chance before) | November 3 |