Mount Rainier is home to a somewhat ethnically diverse population as the school's number of BIPOC exceeds Washington state averages.

The 2009 boys soccer team had great success going undefeated to win the Seamount League title and only allowed 2 goals for the entirety of the season and their stretch into the 3A state tournament.

There have been several recent individual champions in the distance events, notably Ryan Prentice, who went on to Oklahoma State University.

[14] Top tennis player Lynn Johnson graduated in 1992 with a full ride scholarship to play on the offensive line for the Washington Huskies football team.

[15] The boys' basketball team finished third in the state AAA championship in 1971, losing to Pasco in a record quadruple overtime semi-final.

[10] In 2012 they competed in the South Puget Sound League (SPSL) and finished 4th place at the AAAA state tournament.

But when Chris Paulson took over as head coach for the 2008–09 season they made it to the playoffs eventually losing to Eastside Catholic.

In 2019 the football team earned another District playoff game after defeating Enumclaw in a league play-off and winning the NPSL Sound Division championship.

During the construction students attended classes at the Highline Public Schools owned Olympic site in the North Hill neighborhood of Des Moines.