- Western Terminus:
- North Highland Avenue (US 9) in Ossining
- Eastern Terminus:
- Bedford Road (NY 117) in Mount Kisco
- 8.71 miles
NY 133 is an east/west route in Westchester County. It begins at North Highland Avenue (US 9) in Ossining and runs east along Croton Avenue. After a little over a mile, there is an interchange with the Briarcliff-Peekskill Parkway (NY 9A). NY 133 curves to the northeast and changes names to become Somerstown Road. After about a mile and a half, Somerstown Road ends at Saw Mill River Road (NY 100). NY 133 is multiplexed with NY 100 for a few blocks. In this area, there is an interchange with the Taconic Parkway. NY 133 then splits off onto Station Place, which ends after a few blocks at Millwood Road (NY 120). NY 133 and NY 120 are multiplexed along Millwood Road to the east. After about half a mile, NY 120 splits off onto Quaker Road. NY 133 continues east along Millwood Road to Mount Kisco, where it changes names to become West Main Street. It ends at Bedford Road (NY 117). The entire length of NY 133 is a two-lane undivided road.