Frost line depth in Sumner County, KS
How deep the ground freezes in Sumner County, KS
18 in. Dig to 19 in, just below the frost. Nearest NOAA station: Wellington, 4.6 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.