The completed two-story building has a central commons area, similar to other high schools in the district, a 400-seat auditorium for drama and music performances, main and auxiliary gymnasiums, ceramics studio, and improved facilities for other clubs, classes, and activities.

Students began attending classes on January 30, 2019, with completion of the athletic fields and parking lots in August 2019.

Sehome offers students a variety of activities and clubs, including FRC Robotics, Crochet, Debate, DECA, Diversity, Drama Club, FBLA, Hiking, Hispanic Honor Society, Key Club, Knowledge Bowl, Math, Model UN, Peer-Centered Outreach, Photography, QSA, Robotics, Science Olympiad, Sports Med, Teen Court, and Zodiac (an interdisciplinary sailing activity in the San Juan Islands.

The school's sports program is governed by the Washington Interscholastic Activities Association (WIAA), the Northwest Conference, and the district's Athletic Code and Standards.

In sports, Sehome offers its students cross country, football, soccer, swimming, tennis, volleyball, basketball, bowling, gymnastics, wrestling, baseball, fastpitch, golf, track & field, cheerleading, dance and sailing.