In between, the route passes through Letchworth State Park near its southern tip and serves the village of Nunda, where it meets NY 408.

Most of NY 436 is a two-lane highway that traverses largely rural areas of Wyoming and Livingston counties.

It initially heads eastward on Denton Corners Road, overlapping with County Route 38 (CR 38) as it traverses a mixture of open fields and farmland and enters the town of Genesee Falls.

[3] The route occupies the northernmost road in Portageville between NY 19A and Main Street, one that is initially devoid of development due to its proximity to the Genesee River gorge.

As NY 436 approaches Main Street, it trends slightly southward to serve a small handful of homes.

At Main Street, NY 436 abruptly turns north and crosses the Genesee River gorge, reentering Letchworth State Park as it passes into Livingston County and the town of Portage.

From here, NY 436 curves to the northeast for a short distance before resuming its eastward routing through the small hamlet of Oakland and into the town of Nunda.

It curves back to the east at the top of the ridge and generally maintains an east–west alignment for the rest of its length.

The route winds its way across a mixture of farmlands and undeveloped areas in the towns of Ossian and North Dansville to the village of Dansville, where NY 436 passes under Interstate 390 on Ossian Street before ending two long blocks later at Dock Street, designated as NY 36.