Arroyo Elementary, Ontario CA - Test Scores & Data

Original Research by School Decision on Arroyo Elementary

Arroyo Elementary serves kindergarten through eighth grade in Ontario, a fast-growing city in the Inland Empire whose economy centers on logistics, manufacturing, and retail distribution. The school enrolls a small student body, about half of whom come from kindergarten and early elementary grades. Roughly five-sixths of students qualify for free or reduced-price lunch, reflecting the economic profile of this working-class residential area near major transportation and distribution corridors. The student body is predominantly Hispanic, with small populations of other groups.

Academic performance at Arroyo shows a marked split between English language arts and mathematics. In ELA, students in grades seven and eight reach proficiency rates around half, and third grade achieves close to four in ten; other tested grades fall in the low-to-mid range. Mathematics proficiency is substantially lower across the board. Third through fifth grades cluster in the mid-to-high twenties; sixth grade drops to the low teens; seventh grade recovers to about three in ten; and eighth grade settles in the low twenties. Science proficiency, tested in grades five and eight, is notably weak, sitting in the low teens at both grade levels. State assessment data covers only the most recent year, so trends across time are not available.

The strength in ELA, particularly in the middle grades, stands out and may reflect focused instruction in literacy. The steep drop in math proficiency and the weakness in science suggest these are areas where students need additional support. A parent investigating the school may want to ask the administration what approaches are in place to address performance gaps in mathematics and science, and what supports exist for students working below grade level.

Ontario itself is undergoing rapid expansion through Ontario Ranch, a large master-planned community on its southern edge that will eventually add housing, commercial space, and new schools. Downtown Ontario retains a historic, walkable character centered on Euclid Avenue, though the broader city is car-dependent. Housing values in the area are moderate compared to state benchmarks, and rents are affordable relative to median household income, making this part of Southern California more accessible than many nearby communities. The Ontario-Montclair School District, the school's parent district, did not publish information about major changes or strategic shifts that could be confirmed within the research window, so current district direction was not available to report.

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Academic performance

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

Math

Grade 328%

School 28% · District 40% · ▼ 13 pts below district

▼ 15 pts below state median · ▼ 8 pts below county median

Grade 428%

School 28% · District 34% · ▼ 5 pts below district

▼ 9 pts below state median · even with county median

Grade 526%

School 26% · District 34% · ▼ 8 pts below district

▼ 5 pts below state median · ▲ 3 pts above county median

Grade 615%

School 15% · District 32% · ▼ 17 pts below district

▼ 15 pts below state median · ▼ 7 pts below county median

Grade 730%

School 30% · District 33% · ▼ 3 pts below district

even with state median · ▲ 10 pts above county median

Grade 824%

School 24% · District 36% · ▼ 12 pts below district

▼ 4 pts below state median · ▲ 5 pts above county median

English language arts

Grade 339%

School 39% · District 37% · ▲ 2 pts above district

▼ 1 pts below state median · ▲ 6 pts above county median

Grade 431%

School 31% · District 40% · ▼ 9 pts below district

▼ 11 pts below state median · ▼ 4 pts below county median

Grade 528%

School 28% · District 47% · ▼ 19 pts below district

▼ 17 pts below state median · ▼ 12 pts below county median

Grade 631%

School 31% · District 47% · ▼ 17 pts below district

▼ 13 pts below state median · ▼ 8 pts below county median

Grade 751%

School 51% · District 49% · ▲ 2 pts above district

▲ 5 pts above state median · ▲ 13 pts above county median

Grade 850%

School 50% · District 48% · ▲ 3 pts above district

▲ 6 pts above state median · ▲ 14 pts above county median

Science

Grade 512%

School 12% · District 25% · ▼ 13 pts below district

▼ 16 pts below state median · ▼ 10 pts below county median

Grade 813%

School 13% · District 24% · ▼ 11 pts below district

▼ 13 pts below state median · ▼ 7 pts below county median

This schoolOntario-Montclair, 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.