Summary:
ZIP code 94518 has five schools in the Mt. Diablo Unified district: three elementary schools, one middle school and one high school, serving students from elementary through high school. The clearest area-wide concern is that every school is below the state in all-grades ELA, math and science. Across the five schools, the average results are 20 points below the state in ELA, 16 points below in math and 15 points below in science.
Ygnacio Valley High has the area’s highest all-grades ELA result, 37%, while Ygnacio Valley Elementary is lowest at 15%. El Monte Elementary leads math at 36%, 17 points above the other four schools’ average, and is essentially tied with Woodside Elementary in ELA at about 35%. Woodside leads science at 31%, while Oak Grove Middle has the lowest math and science results, at 10% and 9%. Among elementary schools, Woodside’s fifth-grade ELA result stands out at 46%, compared with 36% at El Monte and 15% at Ygnacio Valley Elementary.
Recent changes are mixed: the five-school average rose 2 points in math and science but fell 1 point in ELA from 2024–2025 to 2025–2026. Ygnacio Valley High improved in all three subjects, while Woodside declined in all three. SchoolDigger’s statewide percentile rose 14 points for El Monte over its three-year ranking history, but fell 17 for Woodside and 13 for Ygnacio Valley Elementary. For context, the elementary schools report free/reduced lunch eligible (FRL), 2024–2025: 61% at Woodside, 65% at El Monte and 88% at Ygnacio Valley Elementary. Woodside has the smallest enrollment, 289, and a 25.6 student-teacher ratio; these figures describe school context, not what causes results. Ygnacio Valley High’s 96% graduation rate is above the state’s 88%, but its 31% chronic absenteeism is also above the state’s 18%.
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