Summary:
Schools in ZIP code 91730 include 13 schools—9 elementary, 3 middle and 1 alternative—with no high schools. In 2025–26, the schools’ average results were below California’s in ELA (44% versus 49%), math (32% versus 38%) and science (29% versus 36%). Results varied widely: the gap between the highest- and lowest-scoring schools was 43 points in ELA, 46 in math and 28 in science. The most important finding is that school-to-school differences are much larger than the area averages suggest.
Terra Vista Elementary is the clearest all-around standout, with the area’s highest all-grade results: 65% in ELA, 59% in math and 44% in science. Those scores are about 23, 29 and 16 points above the other schools’ averages, respectively. At the lower end, Bear Gulch Elementary has the lowest ELA and math results, at 23% and 13%; Cucamonga Elementary has the lowest science result, at 16%. Among middle schools, grade-8 ELA is a bright spot at Cucamonga Middle (57%) and Ruth Musser Middle (56%), both above the state’s 49%.
Recent changes are mixed rather than a shared upward trend: from 2024–25 to 2025–26, the average school change was about +1 point in ELA, roughly unchanged in math and slightly down in science, while California’s science result rose 3 points. Some schools made larger gains: Cucamonga Elementary gained 10 points in ELA and 11 in math, while Central Elementary gained 15 in science. SchoolDigger’s rankings also shifted: Ontario Center rose from the 17th to the 33rd percentile over three years, while Bear Gulch Elementary fell from the 22nd to the 7th. As context, 2024–25 free/reduced lunch eligibility ranged from 37% at Terra Vista to 84% at Bear Gulch; reported student-teacher ratios ranged from 17.7 to 26.3. Inland Empire Springs Charter is another distinct option: its ELA result was 54%, above the state, while chronic absenteeism was 34% versus 18% statewide. These comparisons are best read alongside grade-matched results, since schools serve different grade spans.
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