NY 108, assigned in the early 1930s, is the shortest state highway on Long Island.

NY 108 begins at Woodbury Road at the Nassau County line in the community of Cold Spring Harbor.

At the intersection with Stillwell Lane, NY 108 southbound crosses into Nassau County, but soon curves away back into Suffolk.

Soon after, the two-lane road continues into Trail View State Park, where the route becomes desolate, passing two local ponds.

A short distance later, NY 108 enters a small region of houses and intersects with Lawrence Hill Road.