Frost line depth in Union County, OR

How deep the ground freezes in Union County, OR

18 in. Dig to 19 in, just below the frost. Nearest NOAA station: La Grande, 3.8 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