Original Research by School Decision on Diamond Ranch High
Diamond Ranch High serves a predominantly Latino student body, with most students from low-income households. The school enrolls roughly equal numbers across ninth through twelfth grades. A substantial majority of students qualify for free or reduced-price lunch, and the enrollment skews toward Hispanic and Asian students, with smaller shares of Black and white peers.
On California's most recent testing (2024-25), English language arts proficiency reached a solid range, whereas math and science proficiency sit considerably lower. The gap between ELA and quantitative subjects is stark, a pattern that warrants close attention if math or science pathways matter to your family. No prior-year data was available to assess whether performance is trending, stable, or shifting. Graduation rate data was not available.
The school is located in Pomona, a dense, mixed-character city anchored by the Pomona Arts Colony in its historic downtown, a neighborhood blending galleries, ethnic restaurants, artist lofts, and cultural venues. The broader city includes industrial areas, universities, and the Fairplex. In September 2025, the Metro A Line light-rail extension reached Pomona-North, adding a direct rail connection toward Pasadena and downtown Los Angeles. Downtown Pomona hosts the Pomona Public Library, the Fox Theater, and museums including the Latino Art Museum and American Museum of Ceramic Art. Ganesha Park offers hiking toward Mount Baldy.
The city is actively adding housing through the Cesar Chavez Foundation's East End Village (a large affordable project), apartment developments replacing strip malls, and smaller infill projects, driven by state housing requirements and the district's pro-housing stance. Housing values and rents in the 91766 zip code are moderate relative to Los Angeles County benchmarks. Ownership remains a stretch on median household income locally, though renting is more affordable than the county average.
The district itself has made two material changes that affect families. In November 2024, voters approved Measure UU, a bond-and-property-tax measure that funds classroom upgrades, roof and plumbing repairs, asbestos and lead-paint removal, and water safety across district schools. Homeowners will pay higher property taxes for years. In March 2024, the district and teachers union agreed to an ongoing salary increase plus a one-time bump and expanded health benefits, intended to narrow the compensation gap with surrounding districts. This shapes the school's ability to hire and retain staff over time.
Program offerings and AP breadth were not available in the data provided. A parent may want to contact the school directly to learn whether college-prep courses, career pathways, dual-enrollment options, or other program tracks are available. Staffing numbers, attendance data, and discipline information were also not available.
The school sits within Los Angeles County's large district universe. Without multi-year proficiency trends or a graduation rate, a direct read on how Diamond Ranch ranks among county schools is not possible from the available data. The school's low math and science proficiency suggest a need to examine what support and interventions are in place for students in those subjects, especially if STEM interests run high in your household.
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