Diamond Bar High
2,557
Students
26.6:1
S:T Ratio
School Snapshot
Key metrics at a glance1,300
A
28
A
26
A+
46%
B-
27:1
C
98%
A+
This Week at Diamond Bar High – July 26, 2026
342 students practicing on Varsity Tutors
Academic Resources
Typical courses and practice resources for students at Diamond Bar High
Standardized Test Dates
Upcoming national, state, and school calendar dates that affect students at Diamond Bar High.
National Tests
August 7, 2026
SAT — National
August 11, 2026
SAT — National
August 14, 2026
ACT — National
August 22, 2026
SAT — National
August 28, 2026
SAT — National
September 1, 2026
ACT — National
State Assessments
March 1, 2027 – June 30, 2027
CAASPP — Statewide Window
School Milestones
October 1, 2026 – October 15, 2026
Private School Affidavit Filing Window
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1:1 Tutoring
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21400 Pathfinder Rd., Diamond Bar, CA 91765
(909)594-1405
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Walnut Valley Unified School District
Academic Calendar
Important dates, holidays, and school events