Mountainside High School

Mountainside High School is a large public high school in Beaverton, Oregon, serving grades 9–12 with 1,741 students as part of Beaverton School District 48J. In 2025–2026 it ranked 60th of 271 Oregon high schools, placing it in the 78th percentile with 4 stars. That is still well above average, though it is a step down from its earlier peak: the school ranked 6th statewide in 2018–2019, then 24th, 18th, 51st, 61st, and 60th in the years since. The most recent two years have been stable.

On 11th-grade state tests, Mountainside students were 56.6% proficient in English language arts, 31.8% in math, and 45.9% in science — above district and state results in ELA and science, and above the state in math while essentially matching the district. Science is a clear strength: among nearby schools, only International School of Beaverton and Arts and Communication Magnet Academy scored higher. Math trails those two schools and Tigard High School, but stays ahead of most other nearby campuses. The graduation rate was 93.5%, above both district and state, and chronic absenteeism was 31.5%, lower than the state's 33.5% and better than most large nearby high schools.

Mountainside spends less per student ($17,324) than Beaverton High School, Southridge High School, Aloha High School, and Tigard High School, and has a higher student-teacher ratio (21:1) than several of them, yet it generally posts higher graduation rates, lower absenteeism, and stronger ELA and science results — suggesting relatively efficient use of resources. One notable change: the free/reduced-lunch rate doubled in a single year, from roughly 22% to 50.32%, aligning it with other Beaverton high schools; the reason is unclear, so it should be read with caution. Areas to watch include math proficiency relative to the district, English Language Learner effectiveness (percentile ranks of 43rd, 18th, and 67th over three years, in a small subgroup), and the long-term rank trend.