Students from Hillsdale, Montvale and Woodcliff Lake had attended Park Ridge High School.

[7] With increasing enrollment as the suburbs boomed, the towns, with state approval, formed a regional high school district.

In September 1964, Pascack Hills High School opened up to students living in Montvale, Woodcliff Lake and a portion of Hillsdale, with a flexible scheduling program that allowed students to select courses using a system run by an analyst from International Telephone and Telegraph using a mainframe computer system.

This expansion of Pascack Valley High School provided additional classrooms, expanded department areas, and other facilities such as gymnasium, a new cafeteria and library.

In July 2020 the district board of education voted to eliminate both the PVHS "Indians" and the "Cowboys" at Pascack Hills High School.