The Ridge High School Red Devils competes in the
Skyland Conference, which is comprised of public and private high schools in
Hunterdon, Somerset and
Warren counties in
Central Jersey. The conference operates under the jurisdiction of the
New Jersey State Interscholastic Athletic Association (NJSIAA). The school’s current athletic director is Mike Mancino, who began his career in 2023. With 1,414 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. Interscholastic sports offered at Ridge include volleyball, baseball, ice hockey, football, fencing, basketball, cross country, soccer, gymnastics, cheerleading, field hockey, golf, lacrosse, ski racing, softball, swimming, tennis, track and field, winter track, marching band,
Special Olympics Unified Sports and wrestling. The school was classified by the NJSIAA as Group IV North for football for 2024–2026, which included schools with 893 to 1,315 students. The baseball team won the Group II state championship in 1987 (against runner-up
Hackettstown High School in the finals), 2000 (vs.
West Morris Mendham High School) and 2002 (vs.
Dumont High School). The 2000 team finished the season with a record of 27-5 after winning the Group II state title with a 4-1 victory against Mendham in the championship game. The team has won the Somerset County Tournament in 1976, 1980, 1984, 1985, 1989, 2011 and 2022; the seven titles (through 2024) are the second-most in the tournament's history since it was established in 1973. The school was the winner of the 2014-15 ShopRite Cup for Group II, finishing with 68 points, one point ahead of
Hunterdon Central Regional High School. The team repeated as winner of the Group II ShopRite Cup for 2015-16, behind first-place finishes in girls soccer, girls cross country and boys fencing. The school finished in second place in girls tennis and girls golf, third place in football and ice hockey, and earned bonus points for having no disqualifications in the fall and spring seasons. The school was the winner of the Group IV winner of the 2019-20 Shop Rite Cup. The girls tennis team won the Group II state championship in 1984 (defeating runner-up
Millburn High School in the tournament's final round) and 2016 (vs.
Bergen Tech). The 2016 team defeated
Princeton High School 4-1 in the semifinals before knocking off Bergen Tech 4-1 in the finals. The 1985 boys' soccer team finished the season with a 20-0-2 record, the state's only unbeaten team, after winning the Group II state championship, defeating
Millburn High School by a score of 3-0 in the final game of the tournament. The boys' wrestling team won the Central Jersey Group II state sectional title and the overall Group II state championship in 1986. The football team won the Central Jersey Group II state sectional title in 1987, the North II Group III championship in 2003 and the North II Group V title in 2013. The girls' track team won the Group II indoor relay state championship in 1987 and 2007 (as co-champion). The girls' soccer team won the Group II state championship in 1996 (vs. West Morris Mendham High School), won the Group III title in 2003 (vs.
Colts Neck High School) and was Group IV co-champion in 2015 and 2017 (with
Freehold Township High School both years). A 4-1 win against Colts Neck gave the team the Group III championship an undefeated 2003 season, leading the team to take the #3 national ranking with a 22-0 record. A scoreless tie after double overtime with Freehold Township gave the 2015 team a share of the Group IV title and a 23-0-1 record for the season. The 2017 team finished the season with a 18-4-2 record and was co-champion with Freehold Township High School after the Group IV title game ended in a scoreless tie after regulation and two overtime periods. The girls' field hockey team won the North II Group III state sectional championship in 2005. In 2007, the girls cross country team finished third in the NJSIAA Meet of Champions and finished sixth at the
Northeast Nike Team Regional Championships. The next year, the team finished #2 in the Meet of Champions and won the Section 2 Group 4 Championships and the Group 4 Championships. In 2009, the team got 6th place in the Meet of Champions; they took home fourth in 2010 and placed 6th in both the Meet of Champions and the Nike Northeast Regional Qualifier in 2011. The boys' cross country team finished fourth in the NJSIAA Meet of Champions in 2006. The team finished sixth in the NJSIAA Meet of Champions in 2010. The ice hockey varsity team won the Public A state championship in 2008, 2007 and 2019, won the McInnis Cup in 2004, 2005 and 2007-2009 The team won the Public A state championship in 2008, with a 5-0 over
Watchung Hills Regional High School in the tournament final. In 2017, the team went on to win its second Public A state championship, defeating Watchung Hills by a score of 2-1 in the tournament final. The team won the 2019 Public B state championship defeating
Randolph High School. The boy's varsity ski team won the 2009 New Jersey Interscholastic Ski Racing Association (NJISRA) overall state championship. The boys' lacrosse team won the Group III state championship in 2010 (defeating
West Windsor-Plainsboro High School North in the tournament final) and the Group IV title in 2013 (vs.
Southern Regional High School); the team won the 2013
Tournament of Champions vs.
Don Bosco Preparatory High School. The Ridge girls' golf team won the 2015
Tournament of Champions, 26 strokes ahead of
Red Bank Catholic High School in second place, marking the team's fifth consecutive state championship. The Ridge girls' volleyball team won the Group IV state championship in 2017, defeating
Cherokee High School. The coach of the boys fencing team, Stephen Kovacs, was arrested in October 2021 on charges of sexual assault. He died in jail in January 15, 2022. In 2023, the boys' tennis team won the Group IV state championship, the program's first, with a 4-1 victory in the finals against
Cherry Hill High School East. ==Extracurricular activities==