Frost line depth in Whitley County, KY
How deep the ground freezes in Whitley County, KY
17 in. Dig to 17 in, just below the frost. Nearest NOAA station: Williamsburg, 1.7 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.