Frost line depth in Bullitt County, KY
How deep the ground freezes in Bullitt County, KY
16 in. Dig to 17 in, just below the frost. Nearest NOAA station: Bernheim Forest, 4.5 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.