Chaparral Middle School is a California Distinguished School and a National Blue Ribbon School serving 1,283 students…More in grades 6-8. It is a part of the Walnut Valley Unified School District and is located near the center of Diamond Bar.
From 2009 to 2010, Chaparral's Academic Performance Index score rose 49 points from 914 to 963 (on a scale of 200-1000). Compared statewide, the 2010 API scores 10/10. Compared against similar schools, the score is 6/10.