Summary:
ZIP code 91730 has three middle schools: Ruth Musser Middle (grades 5–8), Rancho Cucamonga Middle (grades 6–8), and Cucamonga Middle (grades 6–8). Results vary substantially by school and subject, so an area-wide picture can hide important differences. The clearest shared concern is mathematics: all three schools scored below the state in 2025–2026, and their average was 28%, compared with 38% statewide.
Ruth Musser led the all-grades results in every subject, with 54% in ELA, 32% in math, and 39% in science; it was above the state in ELA by 4 percentage points and in science by 3, but 6 points below in math. Cucamonga was close behind in ELA and math, at 52% and 29%, and scored 31% in science. It also had the strongest grade 7 and grade 8 ELA results among the schools. Rancho Cucamonga was lowest in all three subjects: 40% in ELA, 23% in math, and 21% in science. The gap between the highest- and lowest-scoring schools was 13 percentage points in ELA and 17 in science.
Across the three schools, average scores increased from 2024–2025 to 2025–2026 by 1 percentage point in ELA, 2 points in math, and 3 points in science. Individual trends differed: Rancho improved 2 points in ELA and 4 in math, but its science score rose only 1 point while the state improved by 3; Cucamonga’s science score rose 6 points. SchoolDigger’s statewide percentile rankings also moved in different directions: Rancho rose from 28 to 36, while Ruth fell from 67 to 61 and Cucamonga from 57 to 55. As context, 2024–2025 student-teacher ratios ranged from 17.7 at Rancho to 22.4 at Ruth; free/reduced lunch eligible shares that year were 82% at Rancho, 72% at Cucamonga, and 69% at Ruth. These figures describe context, not causes, and Ruth’s all-grades results include grade 5, unlike the other schools.
Thank you for your feedback!