As of the 2009–2010 school year, it provides instruction for approximately 300 students in grades 9–12 with a staff of about 20 full-time and part-time instructors.

Its mascot is the Mountaineer and the school colors are orange and black.

[3] The Rainier Boys Track and Field team won the school's first ever team championship in 2022, led by University of Texas commit Jeremiah Nubbe, who won both the Shot Put and Discus at state.

[4][citation needed] The girls cross country team won their first state championship in November 2024 after winning both district and league titles.

The state title was the first girls team championship in Rainier High School's history.