The school's "Old Main" building was constructed in 1922 and was used for decades as a teaching space before being converted to district offices.

The campus has slowly expanded over the past 80+ years to include thirteen additional permanent instructional, athletic, and administrative buildings.

Grossmont is directly in between the cities of La Mesa and El Cajon, with a large majority of students being from both areas.

Construction of multiple new buildings is currently underway on the campus, including a school museum and a lunch cafeteria.

Grossmont's varsity baseball team has captured the division II CIF title in the past 4 seasons ('05, '06, '07, '08) and ranks amongst the most competitive high schools in California.

Helix in an amphitheater constructed in the early part of the 20th century for Easter sunrise services.