Frost line depth in St. Tammany Parish, LA

How deep the ground freezes in St. Tammany Parish, LA

3 in. Dig to 12 in, the 12 in code minimum. Nearest NOAA station: Slidell Ap, 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.