Enrollment & Outcomes Scorecard
Diamond Bar High School
Public · Diamond Bar · Los Angeles County · 2,622 students · Class of 2025
★ Top 10% UC Reach
UC Reach Score · Class of 2025
65
Excellent
top 6% in California
Higher than 96% of California high schools
+36.0 pp above peer median (29)
· Ranked #2 of 11 similar schools
5-year UC Reach Score
2021 · 65
2025 · 65
-20%
Senior-class enrollment (2018–2026)
-11.9 pp
vs. Los Angeles County baseline (-8%)
~2519
5-yr projected enrollment (103 fewer than today)
- ▸On UC Reach Score, Diamond Bar High School sits near the top of its similar-school group (ranked #2 of 11): 65 vs. a peer median of 29.
- ▸Diamond Bar High School's UC Reach Score has declined meaningfully from a peak of 76 in 2020 to 65 in 2025 — a 11-point drop that warrants attention. Multi-year UC Reach declines of this size often signal something specific (leadership change, comp-program shift, demographic move) rather than year-to-year noise. This is the kind of trajectory an Enrollment Trend Audit unpacks.
- ▸Senior-class enrollment is down 20% (811→648 from 2018 to 2026), trailing the peer-group median of -4%.
- ▸At its recent rate (-1.3%/yr), enrollment projects to ~2519 by 2029 — about 103 fewer students than today.
Most similar nearby schools
| School | Type | UC Reach Score | Enroll. |
|---|---|---|---|
| Ruben S Ayala High School | Public | 45 | -6% |
| Walnut High School | Public | 51 | -18% |
| John a Rowland High School | Public | 24 | -2% |
| Chino Hills High School | Public | 29 | -1% |
| Troy High School | Public | 72 | -16% |
| LA Serna High School | Public | 17 | -15% |
UC Reach = top-6 UC admits ÷ senior class. Sources: UCOP Admissions by Source School, CDE enrollment, IRS Form 990, NCES F-33. Reach — by Test Prep Gurus · Methodology
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