The early beginnings of Puget Sound Adventist Academy reach back to 1945, with one teacher in the Old Grange Hall. By 1957 the school officially added 9th and 10th grades, officially making it a junior high school.
After 20 years of operating as a junior high school, a grassroots group of parents had a dream to provide a Christian Adventist day academy for Seattle and the surrounding areas. After two years of gathering information, compiling data, creating reports, endless prayer, and countless meetings with the board members from 25 churches and the Day Academy Committee, their dream became reality—the Washington Conference Board of Education voted 17-1, approving the formation of a new day academy.
In 1997, Puget Sound Adventist Academy was officially born, with grades 9-11. In May of 1998, the school graduated its first class of 12th graders. During the 1999-2000 school year, PSAA underwent a full self-study accreditation and received the maximum four-year term of accreditation.
Since its early beginnings, PSAA has continued to grow and better its program and is well known for the community that surrounds it.