The school's boundary serves southern Beaverton, and a small portion of Portland and Tigard.

Southridge opened in 1999 due to overcrowding at other high schools in the Beaverton SD.

SRHS was constructed with the help of a $146 million bond approved in 1996.

Southridge opened to grades 9–11 with an initial enrollment of 1,236.

The school offers International Baccalaureate programs and a large number of Advanced Placement courses.