At a glance
Reported students
2,759
NCES CCD 2024–25
Teachers (FTE)
107.1
NCES CCD 2024–25
Student–teacher ratio
25.8:1
Calculated; not a class-size measure
Grades served
09–12
NCES preliminary directory 2025–26
School benchmarks
California high enrollment
98th percentile
Compared with 2,195 same-level schools reporting enrollment.
District median enrollment
2,386
Los Osos High: 2,759 reported students.
State peer staffing position
94th percentile
25.8:1 reported; state peer median 19.2:1. Ratio is not class size.
Historical enrollment and staffing · CRDC 2021–22
These older figures are kept separate from 2024–25 statistics and benchmarks. Differences between years can reflect changes in enrollment, staffing, or reporting scope.
- Students
- 2,864
- Teachers (FTE)
- 113
- Student–teacher ratio
- 25.3:1
What the reported data says about Los Osos High
Los Osos High is a public high school serving grades 09–12 in Rancho Cucamonga. It is one of 11 current school records connected to Chaffey Joint Union High. NCES reports 2,759 students for 2024–25.
Among 2,195 high schools in California with comparable records, this school is larger than the reported median of 416 students. Its enrollment is at approximately the 98th percentile for that peer group. Size describes the campus, not instructional quality.
The reported student–teacher ratio is 25.8:1, above the California median of 19.2:1 for the same school level. This ratio uses total enrollment and teacher FTE; it is not an average classroom headcount and can be affected by special programs or part-time staffing.
The largest reported race and ethnicity groups are Hispanic or Latino (41.4%) and White (24.4%). English learners represent 3.6% of enrollment. Students served under IDEA represent 8.8%. These figures help families understand who the school serves; they are not rating inputs.
The 2021–22 civil-rights collection reports AP student enrollment, gifted and talented programming. The school reported 17 AP courses. Program availability changes, so families should confirm the current catalog and participation rules directly with the school.
Questions worth asking Los Osos High
- 1How do the reported 25.8:1 student–teacher ratio and 107.1 teacher FTE translate into actual class sizes by grade?
- 2Have the reported academic programs changed since the 2021–22 CRDC collection?
- 3What counseling support is available today? The school reported 7 counselor FTE in 2021–22.
- 4Does community eligibility provide breakfast and lunch to every enrolled student, and are summer meals available?
Enrollment needs
- English learners
- 3.6%
- Students with disabilities
- 8.8%
- Free/reduced-price lunch
- 43.7%
- Lunch program
- Yes under Community Eligibility Option (CEO)
Reported support staff
- Counselors (FTE)
- 7
- Nurses (FTE)
- 1
- Psychologists (FTE)
- 1
- Social workers (FTE)
- 0
CRDC 2021–22 full-time-equivalent counts; verify current assignments with the school.
Student demographics
Race and ethnicity share of reported enrollment
- White24.4%
- Hispanic41.4%
- Black5.9%
- Asian22.9%
- American Indian / Alaska Native0.3%
- Native Hawaiian / Pacific Islander0.1%
- Multiracial4.9%
Race/ethnicity: NCES CCD 2024–25. English learner and disability context: CRDC 2021–22. Lunch eligibility: NCES CCD 2024–25. Privacy rules can produce missing values.
Programs reported by the school
AP student enrollment
Students enrolled
17 distinct courses reported
Gifted and talented
Offered
Computer science
Not reported as offered
CRDC 2021–22: the AP flag records student enrollment; gifted and computer-science fields describe reported programs/classes. Confirm current courses and eligibility with the school.
Other schools in Chaffey Joint Union High
Start with campuses at the same school level or with similar reported enrollment.
Montclair High
High · Grades 09–12
2,515 reported students
Chaffey High
High · Grades 09–12
3,127 reported students
Alta Loma High
High · Grades 09–12
2,386 reported students
Rancho Cucamonga High
High · Grades 09–12
3,221 reported students
Colony High
High · Grades 09–12
2,109 reported students
Etiwanda High
High · Grades 09–12
3,446 reported students