Frost line depth in Covington city, VA
How deep the ground freezes in Covington city, VA
19 in. Dig to 19 in, just below the frost. Nearest NOAA station: Covington Fltr Plt, 2.1 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.