Summary:
ZIP code 91701 has two public high schools, both serving grades 9–12 in the Chaffey Joint Union High district. In 2025–2026, both schools were above the state in English language arts, while math and science results were more mixed; their graduation rates were high, but chronic absenteeism was also above the state rate. The clearest difference between the schools is science: Rancho Cucamonga High led Alta Loma High by 13 percentage points.
Rancho Cucamonga High stands out at the top for proficiency in all three subjects, while Alta Loma High is lower in each. Their ELA results were closest: 70% versus 68%, a 2-point gap. The difference was 7 points in math (46% versus 39%) and 13 points in science (47% versus 34%). Both schools were above the state in ELA; in math, Rancho was 7 points above the state and Alta Loma was about even, while Alta Loma was 2 points below the state in science. Graduation rates were nearly identical at 95% for both, compared with 88% statewide. Chronic absenteeism, however, was 22% at each school, above the state’s 18%.
Results moved in different directions over the two years: both schools improved in math and science, but ELA declined. From 2024–2025 to 2025–2026, Rancho’s ELA fell 5 percentage points as its math rose 3 and science rose 7; Alta Loma’s ELA fell 4 points as math rose 5 and science rose 6. SchoolDigger gives both schools four stars; its 2025–2026 statewide rankings place Rancho at the 85th percentile and Alta Loma at the 71st. Their 2024–2025 student-teacher ratios were similar, 25.1 and 24.8. Both report free/reduced lunch eligible for 2024–2025: 57% at Rancho and 60% at Alta Loma, a 3-point difference; these figures are context, not an explanation for outcomes.
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