Buffalo Grove High School opened in 1973, drawing students and staff from Wheeling and John Hersey High Schools. Dr. Clarence M. "Chick" Miller, formerly assistant principal at Wheeling High School, was named the school's first principal.
On March 12, 1976, President Gerald Ford, during his campaign against former California Governor Ronald Reagan, made a March primary appearance in the gymnasium of Buffalo Grove High School.[5]
In 2003, new classrooms, a foyer, and offices opened as part of a six-million dollar renovation. The "Circle Drive" on the west side of the school was greatly reduced in size to make room for the new classrooms and foyer. The new classrooms included new science labs and special-ed facilities. Additionally, room was made in old storage space on the second floor of the south side of the building for new foreign-language classrooms.
On August 27, 2004, the Bison hosted their first Friday night game under new lights at Bison Stadium. They were the final team in the Mid-Suburban League to switch from Saturday afternoons to Friday night games.
A renovation of the school in 2014 added a multimillion-dollar pool area. Teams from Buffalo Grove HS compete in the Mid-Suburban League (MSL). Buffalo Grove is also a member of the Illinois High School Association (IHSA), the governing body for most interscholastic sports and competitive activities in Illinois.[8]
Buffalo Grove supports 47 student clubs and activities, an entire and updated list of which can be found at the school's website.[11] These include music, the arts, culture and language, social/political action, and student government. Buffalo Grove also has a nationally recognized Speech and Debate team, boasting the 99th best Lincoln Douglas Debate team in the National Forensics League.
Among the clubs are chapters of these more nationally notable groups: NJROTC, SADD, Scholastic Bowl, Science Olympiad (which won the Illinois State Championship in 1989, 1990 and 2024), and Mathletes.[12]
In March 2012, the Scholastic Bowl Team qualified for the IHSA State Meet in Peoria, Illinois by beating William Fremd High School in the Sectional Final at North Chicago High School. They were also the Regional Champions and MSL Conference Champions, beating Fremd in dramatic fashion 485-480.
Another prominent group at Buffalo Grove was its show choir, The Expressions. This mixed competition show choir was composed of 38 singer-dancers, 12 band members and 4 crew members.[13] Similar to the hit television show Glee, the group met as a class and competed throughout the country at various show choir competitions. They attended the Dekalb Indiana Show Choir Invitational Competition, the Chicagoland Showcase Competition, and the Nashville Show Choir Nationals Competition.[13]