Summary
Santa Susana High is a grades 9–12 school in Simi Valley, California, with 1,033 students, and is part of Simi Valley Unified. Its most important strength is consistent academic performance: 2025–26 results were above both the state and district in ELA, math and science.
Among nearby schools with reported scores, Santa Susana ranks third in each subject: 82% in ELA, 51% in math and 68% in science. The High School at Moorpark College and Oak Park High score higher in all three, while Santa Susana is ahead of the other nearby schools with results. Compared with the state, Santa Susana leads by 33 points in ELA, 13 in math and 32 in science; its leads over Simi Valley Unified are 32, 14 and 28 points, respectively. It also scores above Royal High, Simi Valley High and Apollo High in every subject. Math is the relative weak spot: it has the smallest advantage over the state and is furthest behind the nearby leaders.
Scores have risen overall since 2022–23: ELA increased 4 points, math 2 and science 11, although math fluctuated, falling to 39% in 2023–24, rising to 58% the next year and then reaching 51%. SchoolDigger gives Santa Susana five stars and ranks it 140th of 2,137 California schools, at the 93rd percentile; the district ranks 454th of 968, at the 53rd percentile with three stars. SchoolDigger’s ranking suggests the school serves Asian students less strongly than its overall standing indicates: that group ranked at the 71st percentile in 2025–26, versus 93rd overall, though up from the 54th percentile in 2023–24. Its Multi-racial Students ranking also rose sharply, from the 39th percentile in 2021–22 to the 84th in 2023–24. The 2024–25 student-teacher ratio was 20.3, and 31% of students were reported as free/reduced lunch eligible. Some nearby scores are suppressed, and the comparison includes alternative schools, so not every comparison is like-for-like.
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