Deck code & footing depth by state
The deck framing tables are national (IRC R507), but footing depth follows your local frost line. Pick your state for its typical footing depth and a calculator preset to it.
Alabama12"Alaska100"Arizona18"Arkansas14"California18"Colorado36"Connecticut42"Delaware30"Florida12"Georgia12"Hawaii12"Idaho24"Illinois42"Indiana36"Iowa48"Kansas30"Kentucky24"Louisiana12"Maine60"Maryland30"Massachusetts48"Michigan42"Minnesota60"Mississippi12"Missouri30"Montana48"Nebraska42"Nevada24"New Hampshire60"New Jersey36"New Mexico18"New York48"North Carolina15"North Dakota60"Ohio32"Oklahoma18"Oregon18"Pennsylvania36"Rhode Island40"South Carolina12"South Dakota48"Tennessee15"Texas12"Utah30"Vermont60"Virginia18"Washington18"West Virginia30"Wisconsin48"Wyoming48"