PublicGrades 9-12
Diamond Bar High School
21400 Pathfinder Road, Diamond Bar, CA 91765-2747(909) 594-1405
Total Students2,563
Student/Teacher26.01:1
Math Prof.68.33%
Reading Prof.76.32%
Graduation Rate95.8%
School Information
Charter SchoolNo
Magnet SchoolNo
Virtual SchoolNo
CountyLos Angeles
School DistrictWalnut Valley Unified School District
Principal / AdminCourtney Corona(909) 594-1405
Founded1980
Free/Reduced Lunch22.59% Eligible
Acceptance Rate100%
Student Demographics
White5%
Hispanic17.2%
Black1.4%
Asian71.9%
Pacific Islander0.4%
Two Or More4.1%
Gender Distribution
51.7%
48.3%
Male Female
Students per Grade
Grade 9646
Grade 10626
Grade 11644
Grade 12647
School Calendar 2026-2027
August 2026
Academic Schedule • 2026-2027
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Diamond Bar High School
Academic Calendar (2026-2027)
July 2026
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August 2026
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September 2026
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October 2026
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November 2026
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December 2026
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January 2027
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February 2027
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March 2027
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April 2027
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May 2027
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June 2027
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Key Dates & Holidays
First Day of SchoolAug 10
Start of First Grading PeriodAug 10
Labor Day HolidaySep 7
End of First QuarterOct 9
Veterans Day HolidayNov 11
Thanksgiving Recess BreakNov 23
End of First SemesterDec 17
Modified School Day (Semester End)Dec 17
Winter RecessDec 21
New Year's Day HolidayJan 1
Student Holiday / Teacher Work DayJan 4
Start of Second SemesterJan 5
Martin Luther King Jr. Day HolidayJan 18
Presidents Day HolidayFeb 15
End of Third QuarterMar 5
Student Holiday / Staff Development DayMar 5
Spring Recess Break BeginsMar 26
Spring Recess Break EndsApr 2
Last Day of SchoolMay 27
Modified School Day (Last Day)May 27
End of Second SemesterMay 27
Memorial Day HolidayMay 31
Key Dates & Holidays
2026-2027Community Reviews
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