In 1974, another addition was added that cost $5 million, providing a new Music and Art Department, new gymnasium, locker rooms, classrooms and parking.

[24] In 2002, the boys' soccer team earned the North I, Group IV sectional title, edging Clifton High School 3-2 in the tournament final.

[25] The 2017 team finished the season with a 21-0-3 record after winning the program's 12th Group IV title with a 3-1 victory against Princeton in the championship game.

[26] The 2021 team that finished the season with a 22-1-1 record after winning the program's 13th Group IV title with a 6-2 victory against Freehold Township in the championship game at Kean University.

[28] The 1982 team took the lead after scoring four runs in the top of seventh and ended a rally in the bottom of the inning with a triple play to seal a 4-2 victory over Edison in the championship game at Mercer County Park to win the Group IV title and finish the season with a record of 24-3.

[citation needed] The baseball team won the North I, Group IV state sectional championship in 2003 with a 5-3 win vs. Ridgewood High School in the tournament final.

[31][32] The girls' soccer team won the first-ever Hudson County Tournament, defeating Bayonne High School 6-0.

[35] In May 2016, the Kearny girls' crew Lightweight Four placed 3rd out of 15 boats at the Scholastic Rowing Association of America's National Championship Regatta, taking home the bronze medal.

Each year in late May or June, the student body of Kearny High School has the opportunity to collectively display and celebrate its rich cultural diversity.

On the day of the festival, students go down to the school's football field to visit the multiplicity of tents and tables that are set-up; with some selling food, desserts, and jewelry.

Kearny High School's student populated is largely represented by Irish-Americans, Peruvian-Americans, Portuguese-Americans, Brazilian-Americans, Puerto Rican-Americans, and Dominican-Americans, among many other groups.

"[42] The teacher is said to have also taught that there were dinosaurs aboard Noah's Ark and that there is no scientific basis for evolution or the Big Bang theory of the origin of the universe.

[42] LaClair's supporters reported that "he has been the target of harassment and a death threat from fellow students and 'retaliation' by school officials who have treated him, not the teacher, as the problem.

"[43] Deborah Jacobs, executive director of the American Civil Liberties Union of New Jersey (ACLU-NJ) said Kearny High School had "violated the spirit and the letter of freedom of religion and the First Amendment", and that the ACLU would support the LaClairs if they were to file suit.

[44] This matter is the subject of an hour-long documentary film In God We Teach, which includes statements from a variety of people involved (in particular both the teacher and student) as well as others outside the school.

[45][46] During the 2006-07 school year Celeste Adamski, a 27-year-old English teacher was suspended with pay on suspicion of sexual activity with one or more of her students.