Summary:
Schools in ZIP code 92376 include 20 schools: 13 elementary, two middle, three high and two alternative schools. In 2025–26, their average results were 38% in ELA, 24% in math and 23% in science, compared with state averages of 49%, 38% and 36%. The clearest finding is how widely results vary from one school to another, so ZIP-code averages alone can hide very different school experiences.
Samuel W. Simpson Elementary stands out: it had the highest all-grades results in the group, at 68% in ELA, 54% in math and 48% in science—each above the state. At the other end, Dr. John H. Milor High Continuation had the lowest results, at 10%, 4% and 1%, respectively. Across all 20 schools, the gap between the highest and lowest results was 58 points in ELA, 50 in math and 47 in science. Among other notable results, Rialto High led conventional high schools in grade 11 ELA at 63%, while Zupanic Virtual Academy scored above the state in all-grades math and science.
Group averages improved from 2024–25 to 2025–26 in ELA, up 1 point, and math, up 2 points; science rose 1 point, but the state improved faster, so the science gap widened. The alternative schools illustrate why families may want to compare more than test scores: Vista Norte Public Charter had 19% graduation and 50% chronic absenteeism, while Zupanic had 96% graduation and similarly high absenteeism, at 49%. The reported low-income measure is free/reduced lunch eligible for 2024–25; rates ranged from 81% at Milor to 93% at Merle S. Casey Elementary. Simpson’s rate was 83%, close to Milor’s, despite their very different scores. SchoolDigger’s statewide percentile ranking rose for Sam V. Curtis Elementary, from 28 to 46 over three years, while Warren F. Frisbie Middle rose from 12 to 26.
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