Enrollment
2,109
California · 2024-25 NCES data
High school (grades 9-12) · Ontario, CA
Colony High
Federal NCES profile for Colony High, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 31/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 060816010606
👥 S:T ratio 3
📚 AP courses 65
🌟 Gifted program 70
🎓 Counselors 16
📋 Attendance 0
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Colony High earns 31/100 on the Resource Investment Index, with class sizes larger than 73% of California schools. It is also one of the largest schools in California.
- #6 of 6
- high schools in Ontario · Resource Index
- 31
- Resource Index · Lower
- 24.2:1
- large classes for California
- 54.1%
- free-lunch eligible
Colony High has class sizes larger than 73% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Colony High ranks #6 of 6 high schools in Ontario, CA.
School address
District: Chaffey Joint Union High · California
NCES ID 060816010606 Verify on NCES CCD record →
Teachers (FTE)
87.0
Federal CCD staff survey
Students per teacher
24.2:1
vs 21.5:1 California avg
+13% vs state
Free-lunch eligible
54.1%
vs 55.5% California avg
-3% vs state
Student-teacher ratio in context
How Colony High compares with California and U.S. medians
What stands out at Colony High
Colony High is a higher-need, large high school in Ontario, California, enrolling 2,109 students.
Class loads run somewhat heavier than typical: 24.2:1 puts it in the larger third of California schools by student-teacher ratio.
Its free-meal eligibility rate of 54.1% lands close to the California typical range, neither a high- nor low-need campus by this measure.
By headcount it is one of the larger campuses in California, bigger than 97% of state schools at 2,109 students.
Its Resource Investment Index lands in the lower third of 9,998 scored California schools.
Among 295 similarly sized, similarly resourced-need California schools statewide, it ranks #249, in the lower tier once campus size and economic need are matched.
Its student body is led by Hispanic or Latino (66%) and African American (13%) (diversity index 53/100).
On the academic-pipeline side it reports 13 Advanced Placement courses.
Counselor access is stretched at roughly 422 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Chronic absenteeism is elevated: 46.1% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
The federal civil-rights collection also records 6 expulsions at this campus for 2021-22.
Among Ontario's high schools, it stands alongside Chaffey High (3,127 students): Colony High is smaller than that campus by headcount and runs heavier classes (24.2:1 vs 22.8:1).
Chaffey Joint Union High also operates Etiwanda High (3,446 students) and Rancho Cucamonga High (3,221 students) alongside Colony High.
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Colony High compares
Colony High on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 24.2:1 | ▲ 13% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 54.1% | ▼ 3% | 55.5% | 51.7% |
| Enrollment | 2,109 | top 3% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
24.2:1
Leaner classes than 6% of US schools, heavier class loads than most.
2,109
Bigger than 98% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
54.1%
free-lunch eligible
- 3% below the California average of 55.5%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
24.2:1
students per teacher
- 13% above state mean
Top 73% in California - lower ratio than 27% of state schools
Well above 20:1, one of the more stretched staffing loads nationally relative to enrollment.
Engagement
46.1%
chronically absent (missed 10%+ of school days)
At or above 20%, the commonly used threshold for "high" chronic absenteeism, signaling significant barriers to regular attendance.
Funding equity
$15,404
per pupil, district-wide
- below California avg of $16,509
Somewhat below the U.S. average per-pupil spend; funding constraints may affect programs, facilities, and staffing.
Support staff
Counselors5.0 FTE
Per 422 students, the combined health-and-guidance staffing load for this school.
Discipline context
2
in-school suspensions + 146 out-of-school
Suspension rate: 0.1 per 100 students. Combined in-school and out-of-school rate: 7.0 per 100 students. Reported via the Civil Rights Data Collection. Includes 6 expulsions.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
Student demographics
Hispanic or Latino 66.4%
African American 12.8%
Asian 9.0%
White 7.3%
Two or More 3.1%
Native Hawaiian / Pacific Islander 1.0%
American Indian / Alaska Native 0.3%
Largest group: Hispanic or Latino at 66.4% of enrollment.
Student-body diversity index 52.8/100
Simpson diversity index - at 52.8, Colony High is more mixed than the California school average of 46.0.
Programs
AP courses offered 13
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Chaffey Joint Union High, which includes Colony High.
$15,404
Per student
-7%
vs California
Avg $16,509
-7%
vs U.S.
Avg $16,593
Revenue mix
Local 35.9%
State 52.9%
Federal 11.2%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Colony High Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Etiwanda High | Larger | Lower economic need | Similar S:T ratio |
| Rancho Cucamonga High | Larger | Lower economic need | Similar S:T ratio |
| Chaffey High | Larger | Higher economic need | Similar S:T ratio |
| Los Osos High | Larger | Lower economic need | Similar S:T ratio |
| Montclair High | Similar size | Higher economic need | Lower S:T ratio |
Comparisons are relative to Colony High's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 3,446
- Students per teacher
- 24.6:1
- Resource Index
- 28/100
- Enrollment
- 3,221
- Students per teacher
- 24.4:1
- Resource Index
- 31/100
- Enrollment
- 3,127
- Students per teacher
- 22.8:1
- Resource Index
- 30/100
- Enrollment
- 2,759
- Students per teacher
- 24.2:1
- Resource Index
- 28/100
- Enrollment
- 2,515
- Students per teacher
- 22.5:1
- Resource Index
- 36/100
Similar high schools in Ontario
5 comparable high schools (grades 9-12) serving the same city.
Chaffey High
Standard public school
3,127 students 22.8:1 students per teacher
Ontario High
Standard public school
1,994 students 20.8:1 students per teacher
Valley View High (Continuation)
Alternative education program
370 students 14.8:1 students per teacher
Chaffey District Online High
Alternative education program
93 students 18.6:1 students per teacher
Chaffey Community Day
Alternative education program
20 students 10:1 students per teacher
Similar high schools statewide
Matched by enrollment size and by staffing ratio across all of California, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~2,109 students)
Similar student-teacher ratio (~24.2:1)
Next steps
Verify locally before acting on Colony High's federal record.
- Compare Colony High against another school. Compare schools
- Chaffey Joint Union High's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
Frequently asked questions about Colony High
How many students attend Colony High?
Colony High has 2,109 students enrolled. It is a high school in Ontario, CA.
What is the student-teacher ratio at Colony High?
The student-teacher ratio at Colony High is 24.2:1, which is 13% higher than the California average of 21.5:1 and 54% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Colony High?
54.1% of students at Colony High are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Colony High?
The largest demographic group at Colony High is Hispanic or Latino at 66.4% of enrollment, in Ontario, CA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 52.8/100.
What is the Resource Investment Index for Colony High?
Colony High has a Resource Investment Index of 31/100 (lower reported resources relative to schools nationally) based on 5 factors: student-teacher ratio, AP course offerings, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Colony High rank among high schools in Ontario?
By Resource Investment Index, Colony High ranks #6 of 6 high schools in Ontario, CA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all high schools in Ontario on the city page.
Is Colony High a good school?
Colony High earns 31/100 on the Resource Investment Index, with class sizes larger than 73% of California schools. It is also one of the largest schools in California. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in Chaffey Joint Union High?
Besides Colony High, Chaffey Joint Union High also operates Etiwanda High (3,446 students), Rancho Cucamonga High (3,221 students), and Chaffey High (3,127 students). See the Chaffey Joint Union High district page for the complete list.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.