Frost line depth in Upson County, GA
How deep the ground freezes in Upson County, GA
5 in. Dig to 12 in, the 12 in code minimum. Nearest NOAA station: Thomaston 4se, 1.9 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.