Chaparral Middle
Diamond Bar, CA · Middle School · Grades 6-8
Chaparral Middle is a middle school in Diamond Bar, CA with 1,133 students enrolled and a 64% proficiency rate. Part of Walnut Valley Unified. NCES data from the U.S. Department of Education.
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About This School
Chaparral Middle is a middle school located in Diamond Bar, California. The school serves 1,133 students in grades 6-8. The student-to-teacher ratio is 25.8:1.
According to EDFacts assessment data, 64% of students meet grade-level proficiency standards in combined math and reading.
22% of students qualify for free or reduced-price lunch.
Chaparral Middle is part of the Walnut Valley Unified in California.
How This School Compares
Chaparral Middle has 1,133 students enrolled, making it larger than the average school in Walnut Valley Unified (899 students). Its 64% proficiency rate is 4 percentage points above the district average of 60%. Compared to the California state average of 45%, the school performs 19 points higher. The 25.8:1 student-teacher ratio is above the national average of 16:1.
Frequently Asked Questions
Chaparral Middle has 1,133 students enrolled in grades 6-8. The student-to-teacher ratio is 25.8:1.
According to EDFacts data, 64% of students at Chaparral Middle meet grade-level proficiency standards in combined math and reading assessments.
Chaparral Middle is part of the Walnut Valley Unified in Diamond Bar, 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.
For this entity, the underlying data on this page comes from NCES Common Core of Data and EDFacts. The breakdown above is the federal record; the paragraphs below add the per-entity context that makes the headline numbers usable for a real decision rather than just a data lookup.
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.