Frost line depth in Monroe County, MO
How deep the ground freezes in Monroe County, MO
27 in. Dig to 27 in, just below the frost. Nearest NOAA station: Shelbina, 12.9 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.