Frost line depth in Marion County, AL

How deep the ground freezes in Marion County, AL

12 in. Dig to 12 in, the 12 in code minimum. Nearest NOAA station: Hamilton 3 S, 6.9 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.