Summerhill is a town in Cayuga County, New York, United States.

Prior to the American Revolution, this area was part of the territory of the Onondaga people.

Afterwards, Summerhill was part of the Central New York Military Tract, land reserved for veterans.

New York State Route 90 is an east-west highway in south of Summerhill.

New York State Route 41A crosses the northeastern part of the town.

16.0% of all households were made up of individuals, and 6.1% had someone living alone who was 65 years of age or older.