Around the lobby in this portion are the cafeteria, school office, library, computer lab, and special subject classrooms.

The main two-story academic wing housing most of the school's classrooms extends out to the west from the core lobby area.

North of the core lobby is the new gymnasium and athletic and physical education spaces as well as the renovated 1971 wing which was completed during the summer of 2013.

By the turn of the millennium, the high school supported a peak occupancy of approximately 3,000 students.

[10] Longmeadow has a storied high school lacrosse tradition in both the boys' and girls' programs.

Since 1970, the first year of varsity play for the boys' lacrosse program at Longmeadow, the team won Massachusetts State Championships in 1970, '74–'77, '79–'81, '83–'86, '88–90, '92, '97, '08, '13, '22 and 2024.

Longmeadow's Field Hockey's team won its first state title in 2022, after seven previous final appearances.

[11][12][13] The 2007 team finished 13–0, a school record due to the new playoff system, and beat Leominster 21–0 in the Division 1 Super Bowl at Westfield State University.

However, they went on to participate in their 13th consecutive Division I Super Bowl, and went on to win their 9th Western-Central Mass State Championship over Fitchburg.

The Longmeadow High School boys tennis team has won 25 Western Mass titles (D-I) between 1999 and 2023.