Frost line depth in Navajo County, AZ

How deep the ground freezes in Navajo County, AZ

18 in. Dig to 19 in, just below the frost. Nearest NOAA station: Keams Canyon, 29.9 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 · Method