Frost line depth in Fremont County, WY
How deep the ground freezes in Fremont County, WY
45 in. Dig to 46 in, just below the frost. Nearest NOAA station: Riverton, 6.7 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.