Frost line depth in Caddo County, OK
How deep the ground freezes in Caddo County, OK
12 in. Dig to 13 in, just below the frost. Nearest NOAA station: Fort Cobb 4nnw Mesonet, 5 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.