Frost line depth in Carter County, OK

How deep the ground freezes in Carter County, OK

10 in. Dig to 12 in, the 12 in code minimum. Nearest NOAA station: Ardmore 7wnw Mesonet, 5.2 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.