 In 2013, a Mountain Lakes High School quiz bowl team won the Tri-State and New Jersey championships of MSG Varsity's TV show, "The Challenge".The Mountain Lakes High School Lakers compete in the Northwest Jersey Athletic Conference which includes public and parochial high schools covering Morris, Sussex and Warren counties in northwestern New Jersey, operating under the jurisdiction of the New Jersey State Interscholastic Athletic Association (NJSIAA), following a reorganization of sports leagues in Northern New Jersey by the NJSIAA.With 511 students in grades 10–12, the school was classified by the NJSIAA for the 2015–16 school year as North I, Group II for most athletic competition purposes, which included schools with an enrollment of 495 to 762 students in that grade range.