Frost line depth in Stafford County, VA
How deep the ground freezes in Stafford County, VA
15 in. Dig to 15 in, just below the frost. Nearest NOAA station: Fredericksburg Sewage, 9.4 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.