Frost line depth in Gilmer County, WV
How deep the ground freezes in Gilmer County, WV
19 in. Dig to 20 in, just below the frost. Nearest NOAA station: Glenville, 1.6 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.