Summary:
ZIP code 92592 has four high schools in Temecula Valley Unified: Great Oak, Temecula Valley and Rancho Vista serve grades 9–12, while Susan H. Nelson serves grades 6–12. Results show a wide divide: in 11th grade, Great Oak and Temecula Valley were above state proficiency in all three subjects, while Nelson and Rancho Vista were below in all three. The most important finding is that the schools’ results differ substantially, so an area-wide average would hide important differences between campuses.
Great Oak leads the 2025–26 all-grades results, with 82% proficient in ELA, 55% in math and 63% in science—about 33, 16 and 27 percentage points above the state, respectively. Temecula Valley ranks second at 73%, 41% and 47%, modestly above the state in math and more clearly ahead in ELA and science. Nelson is near the state in ELA (48%) but 21 points below in math and 15 below in science; Rancho Vista is below state results in all three, by about 25–31 points. SchoolDigger rates Great Oak 5 stars and Temecula Valley 4, compared with 2 for Nelson and 1 for Rancho Vista.
Average results across the four schools rose from 2024–25 to 2025–26 by 1 point in ELA, 6 in math and 4 in science, outpacing state gains in each subject. Improvement was not universal: Nelson’s ELA result fell 8 points and its science result fell 5, while the other schools improved in all three subjects. Context measures do not follow a simple pattern: for 2024–25, free/reduced lunch eligible shares were 25% at Great Oak, 36% at Temecula Valley, 36% at Nelson and 63% at Rancho Vista; Rancho had the lowest student-teacher ratio, 11.7, but also the lowest test results. The all-grades comparison includes different grade spans; 11th-grade results offer a more like-for-like view.
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