Enrollment & Outcomes Scorecard
Los Osos High School
Public · Rancho Cucamonga · San Bernardino County · 2,735 students · Class of 2025
UC Reach Score · Class of 2025
27
Around the CA median
near the state median
Higher than 69% of California high schools
+14.1 pp above peer median (13)
· Ranked #1 of 11 similar schools
5-year UC Reach Score
2021 · 34
2025 · 27
-18%
Senior-class enrollment (2018–2026)
-18.3 pp
vs. San Bernardino County baseline (+0%)
~2593
5-yr projected enrollment (142 fewer than today)
- ▸On UC Reach Score, Los Osos High School sits near the top of its similar-school group (ranked #1 of 11): 27 vs. a peer median of 13.
- ▸Los Osos High School's UC Reach Score has declined meaningfully from a peak of 44 in 2024 to 27 in 2025 — a 16-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 18% (820→670 from 2018 to 2026), trailing the peer-group median of -1%.
- ▸At its recent rate (-1.8%/yr), enrollment projects to ~2593 by 2029 — about 142 fewer students than today.
Most similar nearby schools
| School | Type | UC Reach Score | Enroll. |
|---|---|---|---|
| Rancho Cucamonga High School | Public | 22 | +1% |
| Summit High School | Public | 14 | +12% |
| Alta Loma High School | Public | 11 | +8% |
| Upland High School | Public | 19 | -9% |
| Etiwanda High School | Public | 15 | -4% |
| Chaffey High School | Public | 10 | -4% |
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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