Frost line depth in Republic County, KS
How deep the ground freezes in Republic County, KS
28 in. Dig to 28 in, just below the frost. Nearest NOAA station: Belleville, 1 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.