Original Research by School Decision on Mt. Diablo High
Mt. Diablo High sits on Grant Street in Concord, a short walk from Todos Santos Plaza and the city's downtown BART station. That location puts students close to the commercial and civic heart of central Contra Costa County, a city publicly reported as the largest in the area, with a diverse, middle-class character shaped by post-war suburban growth and a walkable historic core. Employers in the area include a major regional health system, a Bank of America technology center, and the school's own parent district, among others. For a family evaluating the neighborhood alongside the school, the surrounding streets are suburban in form outside the compact downtown, though the city's long-planned redevelopment of a former naval weapons station on the city's northeast side could add substantial housing over the next decade or two if construction proceeds on the tentative schedule publicly reported by city officials.
The school serves grades nine through twelve with an enrollment that places it in a mid-to-large range for a high school. The student body is predominantly Hispanic, with meaningful representation from Black and Asian students and smaller shares of other groups. A majority of students qualify for free or reduced-price meals, which gives a sense of the economic circumstances many families at this school navigate. Data on English learner enrollment and students served under IEPs were not available in what was provided.
Academic performance data shows areas that families should examine carefully. In English language arts, fewer than half of students tested at the proficient level in the most recently reported year. In math and science, the shares reaching proficiency are considerably lower, sitting in the low double digits. Trend data across multiple years was not available, so it is not possible from what was provided to say whether these results represent improvement, decline, or stability. A parent who wants context on the direction of the school's academic trajectory would do well to ask the school directly for year-over-year data.
Comparison data relative to districts in Contra Costa County was not available at the individual school level for the metrics typically used, so no placement among county peers can be offered here.
On the program side, the school recently underwent a structural change worth understanding. Mt. Diablo High had operated career-focused California Partnership Academies for many years, giving students a cohort-based pathway through linked courses in fields like construction and mechanical engineering. Beginning with the 2022-23 school year and completing the transition in August 2023, those academies were dissolved and the associated courses were converted into elective pathways open to any student. Publicly reported accounts describe this as a deliberate restructuring, not an elimination of career-connected coursework, but the nature of the experience is different now than it was before. Families who value structured, multi-year career and technical cohort programs should ask the school how the current pathway electives are organized and how students move through them.
On a more additive note, California voters approved an arts and music funding measure in 2022, and Mt. Diablo Unified adopted a multi-year strategic arts plan connected to that funding. Arts and music offerings across district schools, including Mt. Diablo High, are publicly reported to be expanding under that plan, which began taking effect in the 2023-24 school year.
Graduation rate data was not available in what was provided, and no information on chronic absenteeism, discipline, or specific course offerings such as AP or dual enrollment was included. Those are meaningful gaps for a family trying to judge the full academic experience here. The housing market surrounding the school reflects prices well above national norms and above the California median, with rents that consume a high share of income at typical earnings. For a family considering whether to buy or rent in the attendance zone, the affordability picture is genuinely constrained. Home values in the immediate zip code dipped modestly year over year while rents edged upward, which is the current direction of the local market.
See more original research from School Decision →