 Prior to the 2010 realignment, the school participated in the Sussex County Interscholastic League until the SCIL was dissolved in 2009.Hopatcong High School maintains a variety of boys' and gitls' interscholastic sports teams including cross country, soccer, cheerleading, wrestling, basketball, bowling, golf, track and field, softball, baseball and tennis.The school operates as the host school and lead agency for a joint bowling program with Mount Olive High School, under an agreement that expires at the end of the 2017–2018 school year.