Frost line depth in Sweetwater County, WY
How deep the ground freezes in Sweetwater County, WY
43 in. Dig to 44 in, just below the frost. Nearest NOAA station: Rock Springs Ap, 10.2 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.