[6] Despite having two separate campuses, they operated under McHenry Community High School to maintain a unified Warrior identity and spirit.

Construction began that same year and was completed in 2003, adding 24 classrooms, new gym with 2,000 seats, new cafeteria, and staircases (known as Freshman, Sophomore, Junior and Senior Towers) to the Upper Campus, which expanded its capacity to nearly 1,600 students.

During the 2010s, the McHenry High School district developed over 20 Advanced Placement courses and a variety of dynamic, 21st-century electives.

[14] Safety enhancements, such as the BluePoint system, were also implemented, allowing anyone to alert local police of an emergency situation at the high school.

Students compete in matches that involve answering questions in a variety of subjects, which include government, history, art, literature, and math.

BPA participates in competitions in the areas of business, computer science, broadcast journalism, graphics, economics and philosophy in leadership.

Color Guard/Winter Guard is an activity offered to McHenry High School students, where they perform dances while using flags, rifles, and sabres.

The Color Guard/Winter Guard also perform their own show to the high school in the winter season, typically in December.

Students compete in teams or individually and matches follow a structure similar to national professional eSports tournaments.

Gender & Sexuality Alliance, also known as GSA, is a club offered at McHenry High School to students, where they discuss topics surrounding the LGBT community.

LASO also provides community service events, such as orientations, bilingual parent advisory meetings to McHenry High School.

The Marching Band is composed of students who enjoy playing instruments, and perform at all home football games, and select parades in the communities that McHenry High School serves.

Under the direction of Spencer Hile, The McHenry High School Symphonic Band performed at the 2019 SuperState Festival at the University of Illinois Urbana-Champaign.

The McHenry High School Symphonic Band was also accepted to perform at the 2020 All-State Festival in Peoria, Illinois.

Their choir, "Surround Sound," was invited to sing for Eric Whitacre in New York City at Carnegie Hall in November 2020, however, the performance was also canceled due to the COVID-19 pandemic.

[21] The McHenry Key Club received 1st place in the platinum division for the James Robert Hall Achievement Award.

Theel said the Upper Campus club, one of the largest, was mentioned several times for the efforts to continue to serve during a global pandemic in 2020 and 2021.

The Warrior, McHenry High School's yearbook, has received several recognitions from Illinois Journalism Education Association (IJEA).

[23] In 2020, despite a turbulent end of the 2019–2020 academic school year due to the COVID-19 pandemic, The Warrior received third place in overall excellence.

Broadcast, a journalism-heavy course launched in 2022, offers McHenry High School students opportunities to excel in journalism and social media.

In February 2022, the Broadcast program received recognition from Fox 32 (WFLD 32), a local television station in the Chicago Metropolitan area, for being entirely student-run.

Since 2024, McHenry High School moved baseball matches and practices to its main campus' field.