Frost dates in St. Clair, MO
The average last spring frost in St. Clair is around April 20 and the first fall frost is around October 11. That gives St. Clair an average growing season of about 174 days.
Last spring frost
| Early (10% chance after) | April 7 |
|---|---|
| Average (50%) | April 20 |
| Late (90%) | May 7 |
First fall frost
| Early (10%) | September 30 |
|---|---|
| Average (50%) | October 11 |
| Late (90% chance before) | October 29 |