It begins in Holderness, splitting off the Daniel Webster Highway (US 3/NH 25) near Squam Lake.

After a short trip through the extreme corner of Albany, the conjoined routes enter Conway.

The historic eastern terminus of NH 113 as signed was at the Maine state line, along current US 302.

Maine State Route 113 is unrelated to NH 113, though the former does cross into New Hampshire and runs briefly within East Conway.

The road provides access to Hemenway State Forest in the White Mountains area of New Hampshire.

Both ends of the highway are located in the town of Stow, Maine, while most of the route (2.961 miles (4.765 km)) runs in Chatham, New Hampshire.

North of NH 113B's northern terminus, SR 113 immediately crosses into New Hampshire for a couple of miles while retaining its own designation.