Frost line depth in Newport County, RI
How deep the ground freezes in Newport County, RI
19 in. Dig to 19 in, just below the frost. Nearest NOAA station: Newport State Ap, 2.2 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.