The North Plainfield High School Canucks have competed since 2005 in the Raritan Division of the Skyland Conference, which is comprised of public and private high schools in Hunterdon, Somerset and Warren counties, and operates under the supervision of the New Jersey State Interscholastic Athletic Association (NJSIAA). The school had competed in the Mountain Valley Conference prior to the NJSIAA's 2009 reorganization. With 733 students in grades 10-12, the school was classified by the NJSIAA for the 2019–20 school year as Group II for most athletic competition purposes, which included schools with an enrollment of 486 to 758 students in that grade range. The school was classified by the NJSIAA as Group III North for football for 2018–2020.