Arroyo Elementary

As a reasonably sized elementary-level community in Ontario, California, Arroyo Elementary instructs 493 students from grades K through 8, run under Ontario-Montclair.

Within Ontario-Montclair, which oversees 33 schools and 17,640 students, Arroyo Elementary is one campus in the system.

On the student-mix side, Arroyo Elementary logs that nearly all students (90%) are Hispanic. The remainder consists of 3% White, 2% Asian. That is considerably more Hispanic than the county at large, where the share is closer to 55%.

In terms of school funding signals, Arroyo Elementary reports 23 full-time-equivalent teachers, putting the student-to-teacher ratio at about 21.2:1. The state averages around 22.3:1, so this campus is tighter than the state norm typical. Roughly 76% of students at Arroyo Elementary qualify for free or reduced-price lunch, a commonly cited indicator of low-income enrollment.

On a demographically-adjusted basis, Arroyo Elementary performs roughly as the BeatsExpectations model predicts for a school with this FRL share. The predicted value is around 34.1%, the actual is 26.9%, a residual of -7.1 points.

Zooming out to the county, community-level numbers for San Bernardino County indicate the typical household earns roughly $85,478 per year, 23% of adults hold a bachelor's degree or higher, and roughly 11% of residents live below the federal poverty line. Across San Bernardino County's 583 public schools (combined enrollment of about 393,648 students), Arroyo Elementary is one campus in the mix.

Nearest neighbor: Chaffey District Online High, around 0.1 miles off. Counting just inside five miles, 8 other public schools cluster around Arroyo Elementary. On composite proficiency, Arroyo Elementary comes 3rd of 6 in the immediate cluster, beneath the nearby-schools average of 29.5%.

The school occupies a downtown site.

Over the past 7-year window. Looking back 7 years, enrollment at Arroyo Elementary has expanded 38%, going from 358 students in 2018 to 493 in 2025. The student-to-teacher ratio widened from 19.8:1 in 2018 to 21.2:1 today.

On the community side, the page collects discussion, questions, and updates around science fair prep, picture-day reminders, and bus-route questions. Contributors range from current parents to recent graduates and teachers.