Frost dates in Lake St. Louis, MO
The average last spring frost in Lake St. Louis is around April 14 and the first fall frost is around October 18. That gives Lake St. Louis an average growing season of about 187 days.
Last spring frost
| Early (10% chance after) | March 31 |
|---|---|
| Average (50%) | April 14 |
| Late (90%) | May 2 |
First fall frost
| Early (10%) | October 2 |
|---|---|
| Average (50%) | October 18 |
| Late (90% chance before) | November 8 |