Frost line depth in Bibb County, AL
How deep the ground freezes in Bibb County, AL
8 in. Dig to 12 in, the 12 in code minimum. Nearest NOAA station: Centreville 6 Sw, 12.2 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.