Frost line depth in Boulder County, CO

How deep the ground freezes in Boulder County, CO

61 in. Dig to 61 in, just below the frost. Nearest NOAA station: Boulder 14 W, 8.6 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.

Code depth · Snow