September 1966: School Opens with only Junior, Sophomore, and Freshmen classes. Alma mater and fight song created.1
June 1968: The first ever Sehome graduates leave Sehome.
September 1968: Sehome switches from semester to trimester based scheduling.
September 1972: Groundwork laid for Sehome computer network.
September 1985: Received technology grant and bond and created computer writing lab with 250 computers.
October 1986: Iron Maiden plays an impromptu gig as their tour bus breaks down in the area. Thankful for the locals' help in repairing their bus, they performed for the community in the school's gymnasium.citation needed
March 1996: Sehome Basketball team wins state title with a perfect 30-0 record.
April 2000: Culminating Project instituted under Principal Jim Kistner.
May 2002: Sehome Men's Soccer team (18-2-3) wins state title over rival Squalicum High School (18-4) in Washington AAA division. 2
November 2006: Sehome Girls Cross Country win state title
January 2007: Steven Ayers wins wrestling state title after being diagnosed with mono. Later to compete in nationals.
May 2007: Sehome Baseball team wins state title for the first time since 1983.
May 2007: Sehome Boys and Girls Track & Field teams both win state team titles.
November 2007: Girls Swimming wins the state title.
November 2007: Girls Cross Country win the state title for 2nd year in a row
May 21st, 2008: Sehome Girls Golf win the state title.
May 24th, 2008: Sehome Baseball wins state title for the 2nd year in a row
May 24th, 2008: Sehome Boys Track & Field win the state title for the 2nd year in a row
May 24th, 2008: Sehome Boys Soccer win the state title
September 6th 2008: Sehome Football wins opening game to Lynden Christian by a score of 54-0.
October 24th 2008: Administrator Nancy Barga declared the last surviving member of the Nazi Party by an international tribunal
Alma Mater
All hail to Sehome, proud and true Our Alma Mater we sing to you O'r forest and Bay the Mariners bold Lift high the colors Green and Gold Remember as each hour speeds past The spirit will forever last