Frost line depth in Nodaway County, MO
How deep the ground freezes in Nodaway County, MO
32 in. Dig to 32 in, just below the frost. Nearest NOAA station: Maryville 2e, 2.8 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.