Enrollment & Outcomes Scorecard
Los Osos High School
Public · Rancho Cucamonga · San Bernardino County · 2,735 students · Class of 2025
UC Reach · Class of 2025
27%
Higher than 68% of California high schools
+14.1 pp above peer median (13.3%)
· Ranked #1 of 11 similar schools
5-year UC Reach
2021 · 34.2%
2025 · 27.4%
-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, Los Osos High School sits near the top of its similar-school group (ranked #1 of 11): 27% vs. a peer median of 13%.
- ▸Its UC Reach has slipped 4 points since 2018 — worth watching.
- ▸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 | Enroll. |
|---|---|---|---|
| Rancho Cucamonga High School | Public | 22.0% | +1% |
| Summit High School | Public | 14.5% | +12% |
| Alta Loma High School | Public | 10.7% | +8% |
| Upland High School | Public | 18.7% | -9% |
| Etiwanda High School | Public | 15.4% | -4% |
| Chaffey High School | Public | 10.0% | -4% |
UC Reach = top-6 UC admits ÷ senior class. Sources: UCOP Admissions by Source School, CDE enrollment, IRS Form 990, NCES F-33. Test Prep Gurus Intelligence by Test Prep Gurus · Methodology
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