[3] Saddle River Country Day School, founded by John C. and Diane M. Alford on June 24, 1957, opened in September 1960 after overcoming zoning disputes.

Originally housed in a mansion on the Denison estate, the school served grades five through twelve with an initial enrollment of forty-five students.

[10] The campus currently features three buildings:[10] Main Hall: Houses the Lower School and offices for the Headmaster, Admissions, Development, Finance, and Administrative staff.

[12] The Middle School offers a robust curriculum, with accelerated tracks in Science and Math, three world languages (Spanish, French, and Arabic), in addition to introductory courses in Business and Graphic Design.

[13] The Upper School offers the following nineteen Advanced Placement courses:[14] English Literature, English Language, United States History, European History, Human Geography, World History, Psychology, Macroeconomics, Music Theory, French, Spanish, Calculus AB and BC, Statistics, Biology, Physics C: Mechanics, Chemistry, Computer Science Principles and A. Additionally, Upper School students can select a diverse range of electives from Linear Algebra, Artificial Intelligence, Middle Eastern Studies, and Photography.

[14] Saddle River Day School also offers students in the 9th-12th grades the opportunity to participate in the yearly French Exchange Program.

[18][19] The BCSL was disbanded as a part of a wide-ranging realignment of high school sports in northern New Jersey, and Saddle River Day moved to the new NJIC in the fall of 2010.