Frost line depth in Ste. Genevieve County, MO

How deep the ground freezes in Ste. Genevieve County, MO

19 in. Dig to 19 in, just below the frost. Nearest NOAA station: Kaskaskia Rvr Navigation Lock, 13.5 mi.

Your building department sets the legal frost line depth (IRC Table R301.2(1)); footings must go below it (R403.1.4.1). Call them before you dig.