Frost line depth in Hardeman County, TN
How deep the ground freezes in Hardeman County, TN
13 in. Dig to 14 in, just below the frost. Nearest NOAA station: Bolivar Wtr Wks, 3 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.