Chaffey High
Ontario, CA · High School · Grades 9-12
Chaffey High is a high school in Ontario, CA with 3,346 students enrolled and a 27% proficiency rate. Part of Chaffey Joint Union High. NCES data from the U.S. Department of Education.
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About This School
Chaffey High is a high school located in Ontario, California. The school serves 3,346 students in grades 9-12. The student-to-teacher ratio is 24.4:1.
According to EDFacts assessment data, 27% of students meet grade-level proficiency standards in combined math and reading. The school reports a 76% graduation rate.
84% of students qualify for free or reduced-price lunch, indicating the school serves a predominantly low-income community.
Chaffey High is part of the Chaffey Joint Union High in California. The school receives Title I federal funding.
How This School Compares
Chaffey High has 3,346 students enrolled, making it larger than the average school in Chaffey Joint Union High (2,096 students). Its 27% proficiency rate is 16 percentage points below the district average of 43%. Compared to the California state average of 45%, the school performs 18 points lower. The 24.4:1 student-teacher ratio is above the national average of 16:1.
Frequently Asked Questions
Chaffey High has 3,346 students enrolled in grades 9-12. The student-to-teacher ratio is 24.4:1.
According to EDFacts data, 27% of students at Chaffey High meet grade-level proficiency standards in combined math and reading assessments.
Chaffey High has a 76% graduation rate, measuring the percentage of students who graduate within four years.
Chaffey High is part of the Chaffey Joint Union High in Ontario, California. You can view all schools in this district on the district page.
All data on this page comes from the National Center for Education Statistics (NCES) Common Core of Data and EDFacts assessment results. These are official federal datasets published by the U.S. Department of Education.
School profiles are built from NCES directory data and EDFacts assessment results. Proficiency rates reflect combined math and reading performance. Graduation rates are reported for high schools with available data.
this entity is one of the data points covered by this site’s U.S. K-12 school outcomes and enrollment dataset. The detail above comes directly from NCES Common Core of Data and EDFacts; the context that follows situates the headline numbers against the broader distribution across U.S. public schools and districts.
The methodology behind every numeric value on this page is publicly documented on the NCES Common Core of Data and EDFacts portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for this entity is typically a peer within U.S. public schools and districts with similar size, similar exposure, or similar geography — not the national-level summary alone.
Source: NCES Common Core of Data, 2026.