Frost line depth in Prince George County, VA
How deep the ground freezes in Prince George County, VA
14 in. Dig to 14 in, just below the frost. Nearest NOAA station: Disputanta, 5.3 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.