The Bernards High School Mountaineers compete in the
Skyland Conference, which is comprised of public and private high schools covering
Hunterdon, Somerset and
Warren counties, and operates under the jurisdiction of the
New Jersey State Interscholastic Athletic Association (NJSIAA). Bernards joined the Skyland Conference in the 2006–07 school year, after having been in the
Colonial Hills Conference for many years. With 644 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 football team competes in Division 2A of the
Big Central Football Conference, which includes 60 public and private high schools in Hunterdon,
Middlesex, Somerset,
Union and Warren counties, which are broken down into 10 divisions by size and location. The school was classified by the NJSIAA as Group II North for football for 2024–2026, which included schools with 484 to 683 students. The school participates as the host school / lead agency for a joint ice hockey team with
Middlesex High School and
Somerville High School. The co-op program operates under agreements scheduled to expire at the end of the 2023–24 school year. The boys track team won the spring / outdoor track state championship in Group II in 1937, 1948, 1971, 1981, 1982, 1983 (was later disqualified as team champion), 1984 and 1985, and won in Group I in 1947, 1986. The boys cross country team won the Group II state title in 1965, 1977, 1985, 1987 and won the Group I title in 1966, 1968–1970, 1972, 1974–1976, 1978–1984, 1998, 2003 and 2004. The program's 23 state titles are the second-most of any school in the state and the 14 consecutive titles won from 1974 to 1987 are the longest streak of any school statewide. The team won the Meet of Champions in 1981, 1982 and 1985. The three MoC titles are tied for third-most of any school in the state. The girls tennis team won the Group I state championship in 1976 (defeating runner-up
Kinnelon High School in the tournament final) and 2003 (vs.
Point Pleasant Beach High School), and in Group II in 2005 (vs.
Governor Livingston High School). The 1976 team won the Group I title with a 4-1 win against Kinnelon in the final match of the playoffs. After defeating
Leonia High School 3-2 in the semifinals, the 2003 team won the Group I title against Point Pleasant Beach by 5-0 in the tournament finals at
Mercer County Park. The boys tennis team won the Group I state championship in 1977 (against
Glen Ridge High School in the final match of the tournament), in 1982 (vs.
Verona High School), and in Group II in 1978 (vs.
Tenafly High School). The girls cross country team won the Group I state championship from 1978 to 1984, 1986 and 1997, and won in Group II in 1985. The program's 12 state championships are second-most in the state and the program holds the longest streak statewide, with 10 consecutive titles won from 1977 to 1986. The girls spring track team was the Group I state champion in 1982–1985, 1987 and 1993. The program's six group titles are tied for tenth-most in New Jersey. The boys track team won the indoor track championship in Group I in 1983, 1985 and 1989, and won in Group II in 1986. The girls track team won the Group I title in 1983–1985, 1987, 2009 and 2010, and won in Group II in 1986; the seven titles won by the girls program is the fifth-most of any school in New Jersey. The field hockey team won the Central Jersey Group I state sectional championship in 1983, 1992 and 1994, and won the Group I state championship in 1994 against runner-up
Madison High School. The girls team won the indoor relay championship in Group II title in 1985, in Group III in 1986 and in Group I in 2009, 2011 and 2012. The boys track team won the Group II in 1985 and in Group III in 1986. The wrestling team won the Central Jersey Group I state sectional title in 1987, 1989 and 1990. The boys soccer team won the Group I state title in 1989 (against playoff finals opponent
David Brearley High School) and won in Group II in 2006 (vs.
Haddonfield Memorial High School), 2011 (vs.
Holmdel High School), 2016 (vs.
Newton High School) and 2019 (vs.
Delran High School). The 2006-07 Bernards boys soccer team won the Skyland Conference championship in their inaugural year there. The team won the Group II state championship with a 2–1 win over
Ramsey High School in the semifinals and a 3–2 win against Haddonfield Memorial High School in the finals. The girls basketball team won the Central Jersey Group 1 championship in 1997 with a 66-32 against
Highland Park High School in the finals. The ice hockey team won the McInnis Cup in 2001. The boys fencing team was the overall state championship in 2006 and 2008, was épée team winner in 2006, 2008, 2015, 2017 and 2018, and was sabre team winner in 2007. With six, the program has won the second-most squad titles of any school. The team finished 1st in 2006 and 1st in 2008. The girls fencing team won the overall state title in 2007, was épée team winner in 2008, sabre team winner in 2010, 2013 and 2018–2020, and foil team winner in 2014. The program's six squad titles are the third-most in the state. The team defeated
Columbia High School by a score of 16-11 in 2007 to take the program's first state title. The girls' track team was successful in the 1980s, but had been dismantled in 1989 because of budget deficits. The program was resurrected in 2000 and the team has won multiple conference titles and championships. They won the Indoor NJSIAA State Group I Relays along with the Indoor NJSIAA North I Group I Sectional Championships and the Indoor NJSIAA State Group I Championships in 2009 and 2010, the seventh group title won by the program in its history. The girls' track team had four All-Americans in 2010, with its 4x800 team taking 5th place at the New Balance Nationals track meet, with the 7th fastest time in the nation, breaking the Somerset County record and was the fastest time in New Jersey that year. The 2017 girls lacrosse team finished the season with a record of 20-3 after winning the Group II state championship, defeating
Haddonfield Memorial High School by score of 15-5 in the tournament final. The football team won the North II Group II state sectional title in 2023, the program's first, with a 23-17 overtime win in the tournament final against
Lakeland Regional High School, bringing the team's record to 12-0. ==Extracurricular activities==