NY 249 begins at a junction with NY 5 (the Seaway Trail / Erie Road) and County Route 34 (CR 34; Lotus Point Road) in the village of Farnham, located in the town of Brant. NY 249 proceeds eastward away from NY 5 as a two-lane residential road, crossing east through Farnham as Commercial Street.
NY 249 commences at an intersection with NY 5 (the Seaway Trail / Erie Road) and County Route 34 (CR 34; Lotus Point Road) in the village of Farnham, which is part of the town of Brant. The route proceeds eastward away from NY 5 as a two-lane residential road, crossing through Farnham as Commercial Street.