Frost line depth in Carbon County, WY
How deep the ground freezes in Carbon County, WY
44 in. Dig to 44 in, just below the frost. Nearest NOAA station: Rawlins Muni Ap, 15.4 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.