The Watchung Hills Regional High School Warriors compete in the Skyland Conference, which is comprised of public and private high schools in Hunterdon, Somerset and Warren counties and was established following a reorganizattion of sports leagus in Northern New Jersey under the auspices of the New Jersey State Interscholastic Athletic Association (NJSIAA). With 1,469 students in grades 10-12, the school was classified by the NJSIAA for the 2019–20 school year as Group IV for most athletic competition purposes, which included schools with an enrollment of 1,060 to 5,049 students in that grade range. The school was classified by the NJSIAA as Group V North for football for 2018–2020.