Maple Hill Elementary, Diamond Bar CA

Original Research by School Decision on Maple Hill Elementary

Maple Hill Elementary sits on a quiet residential street in Diamond Bar, a predominantly single-family suburban community tucked into the rolling hills of the East San Gabriel Valley where Los Angeles County meets the SR-57 and SR-60 freeways. The school serves kindergarten through fifth grade within Walnut Valley Unified, a district that draws families from well beyond its own boundaries through California's District of Choice transfer program. That program was made permanent by state legislation signed in September 2025, removing a recurring uncertainty for families who had chosen WVUSD schools from outside district lines. Walnut Valley Unified is publicly reported to be the largest District of Choice receiver in the state, which tells you something about how the district is perceived regionally.

Academically, Maple Hill's results on the most recent California state assessments are a clear strength. Across the tested grades, third through fifth, proficiency rates in both English language arts and math are well above what you would typically see statewide. Math scores climb through the upper grades, with fifth graders performing especially well. ELA shows a similar pattern, with the fourth and fifth grade results particularly strong. The third grade ELA rate is the most modest figure in the set, though it still sits comfortably in territory most schools would not reach. Science results for fifth graders, measured on the California Science Test, are also high. When placed against districts across Los Angeles County on an overall proficiency index, Maple Hill lands in the top quartile, which is a meaningful position in a county with more than four hundred school districts. Trend data is available for only a single year, so there is no multi-year arc to report.

The student body is predominantly Asian, making up the large majority of enrollment, with Hispanic students as the next largest group and smaller shares of white students and multiracial students. A modest share of families qualify for free or reduced-price lunch, suggesting a relatively economically stable enrollment compared to many schools across the county. Data on English learner rates and students with IEPs was not available in this dataset, so a parent with a child in either category would want to ask the school directly about support services.

Diamond Bar itself reads as a car-dependent bedroom community without a traditional downtown. Civic life runs through city parks and trail systems, a community event facility in Summitridge Park, and an LA County library branch housed in the City Hall building whose multilingual collections reflect the area's demographic character. The city is largely built out, and its most ambitious current planning effort is a Town Center redevelopment along Diamond Bar Boulevard that would convert roughly 45 acres of suburban retail into a walkable mixed-use district. That project is in its early implementation phase and would represent a meaningful change to the city's character over time if it proceeds.

Housing in the area carries prices well above both the California statewide median and the national median, with typical home values in the zip code running nearly three times the national figure. Rents are also well above national norms. Monthly carrying costs at current mortgage rates are substantial, and the rent-to-income ratio implies that renting in the area also consumes a large share of typical household income. Families considering the area for access to Maple Hill or the broader district should factor in a housing market that is among the more expensive in a county already known for high costs.

No program offerings data was provided for Maple Hill specifically, so information on enrichment, intervention tiers, or extracurricular programming is not available here; the school's own site would be the place to look. Discipline data, attendance rates, and staffing ratios were also not in the dataset.

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Academic performance

How students perform on state tests, by grade, set against the district.

Math

Grade 381%

School 81% · District 78% · ▲ 3 pts above district

▲ 38 pts above state median · ▲ 35 pts above county median

Grade 483%

School 83% · District 74% · ▲ 10 pts above district

▲ 46 pts above state median · ▲ 43 pts above county median

Grade 585%

School 85% · District 70% · ▲ 14 pts above district

▲ 54 pts above state median · ▲ 52 pts above county median

English language arts

Grade 374%

School 74% · District 73% · ▲ 1 pts above district

▲ 33 pts above state median · ▲ 32 pts above county median

Grade 486%

School 86% · District 70% · ▲ 16 pts above district

▲ 44 pts above state median · ▲ 42 pts above county median

Grade 587%

School 87% · District 75% · ▲ 12 pts above district

▲ 42 pts above state median · ▲ 41 pts above county median

Science

Grade 576%

School 76% · District 62% · ▲ 15 pts above district

▲ 48 pts above state median · ▲ 49 pts above county median

This schoolWalnut Valley Unified, same grade

Graduation rate (ACGR) reflects the federally published Adjusted Cohort Graduation Rate for the most recent year available. We refresh this data annually at the close of each academic year in June. The federal source publishes a banded rate (for example, "90-94%") instead of an exact number for cohorts small enough to risk identifying individual students. The state distribution chart, where shown, plots every school in the state with a published rate or band; schools whose rate is federally suppressed are excluded. Where the federal source publishes a band rather than an exact rate, the school is placed within its band using a stable, ID-derived offset, so its position is consistent across visits.

Proficiency by household income

English language arts

Grade 3Lower-income75%Higher-income74%1 pp gap

Grade 4Lower-income77%Higher-income89%13 pp gap

Grade 5Lower-income86%Higher-income88%2 pp gap

Mathematics

Grade 3Lower-income79%Higher-income81%2 pp gap

Grade 4Lower-income75%Higher-income87%12 pp gap

Grade 5Lower-income86%Higher-income84%2 pp gap