NY 249 begins at a junction with NY 5 and County Route 34 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. The route crosses under tracks owned by CSX Transportation. After the tracks, NY 249 darts southeast, then east through Farnham as a two-lane residential roadway, crossing the eastern village line. In Brant, NY 249 drops the Commercial Street moniker in favor of Brant-Farnham Road, crossing an at-grade intersection with US 20. After US 20, NY 249 continues eastward on Brant-Farnham Road, crossing under the lanes of the New York State Thruway, however no interchange is present. After the Thruway, the route crosses south of Brant Town Park as it heads east as a two-lane residential roadway. Approaching the hamlet of Brant, NY 249 intersects with the southern terminus of CR 492. In Brant, NY 249 becomes a two-lane commercial street through the center of town, intersecting with CR 9. This intersection served as the southern terminus of NY 323 until August 14, 1980. After CR 9, NY 249 continues eastward, changing names to Brant-North Collins Road.and soon winding its way through the rural sections of Erie County. At the intersection with Versailles Plank Road, NY 249 proceeds northeast, turning east on Brant Road a short distance later, while Versailles Plank Road continues north as CR 41. NY 249 continues eastward along Brant Road, a two-lane farm road, intersecting with CR 546. The route crosses over Big Sister Creek and becomes residential as it enters the village of North Collins, located in the town of the same name. In North Collins, NY 249 becomes Brant Street, a two-lane village street, intersecting with US 62. At this junction, NY 249 leaves Brant Street for Sherman Avenue, crossing multiple residences and over the former Erie Railroad's Buffalo and Southwestern Railroad. At the junction with High Street, NY 249 runs south for a block on High Street, intersecting with Thiel Road, which NY 249 leaves the village of North Collins on. Thiel Road and NY 249 wind southeast as a two-lane residential road, soon intersecting with Langford Road, where NY 249 turns off Thiel into the town of North Collins. The route crosses through a rural section of North Collins, intersecting with CR 501. After CR 501, NY 249 continues eastward on Langford Road, intersecting with CR 486 and CR 487. The route crosses over a brook and remains going eastward as it enters the hamlet of Langford. In Langford, NY 249 passes several residences before intersecting with NY 75. This intersection serves as the eastern terminus of NY 249, whose right-of-way continues east as CR 39 to the hamlet of New Oregon.
History
NY 249 was assigned as part of the 1930 renumbering of state highways in New York. It initially began at U.S. Route 20 in Farnham and ended at NY 18 in North Collins even though the portion of modern NY 249 east of North Collins was also state-maintained as well. NY 249 was extended east to its current eastern terminus at the hamlet of Langford by the following year following the assignment of NY 18A.
