The 2013 team qualified for the We the People national finals in Washington D.C., but were unable to attend due to budgetary concerns.

[22] In 2007, 2009, and 2016, Montclair High School won the Euro Challenge championship.

[30] The football team competes in the Liberty White division of the North Jersey Super Football Conference, which includes 112 schools in 20 divisions, making it the nation's biggest football-only high school sports league.

[33] Montclair's sports programs include rowing, baseball, football, lacrosse, soccer, ice hockey, basketball, volleyball, softball, track and field, fencing, golf, cross country, field hockey, gymnastics, swimming, wrestling, tennis, and bowling.

[35][36] The baseball team won the North II Group IV state sectional championship titles in 1959, 1961, 1963, and 1964.

[38] The team won the Greater Newark Tournament in 2019, beating Seton Hall Preparatory School by a score of 12-1 under the mercy rule.

[41] The girls' field hockey team won the North II Group IV state sectional title in 1980, 1982, 1985, 1986, 1988, and 1990, and won the North I Group IV title in 2003, 2004, 2010, 2012, and 2014.

[44] In 2014, the team won their third consecutive North I, Group V state title, with a 26–14 win against Passaic County Technical Institute in the final game of the tournament, played at MetLife Stadium.

[45] In 2017, the team won the North I Group V state sectional championship, the program's eighth state title, with a 35–14 win against Union City High School in the tournament final.

Bloomfield was the stronger school in the initial years of the competition, with Montclair dominating since the early 1980s and leading the rivalry with a 69-26-1 overall record as of 2017.

[52] The 1974 team finished the season with a 13–2 record after winning the inaugural NJSIAA state championship with a 9–2 victory against Boonton.

[53] The 1975 team repeated as state champion with a 10–3 win against Boonton in front of a crowd of 2,000.

[56] In 2017, Montclair won the men's and women's Garden State Scholastics points trophies, the first public school to do so.

[59] The girls' soccer team won the Group IV state title in 2014, defeating Hunterdon Central Regional High School by a score of 2–1 in the tournament final to capture the program's first state title and finish the season with a 22–1 record.

[60][61] The boys' tennis team won the overall state championship in 1953 vs. William L. Dickinson High School (Jersey City).