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Email BoardColony High
3850 East Riverside Drive, Ontario, CA 91761-2603
Summary
Colony High is underperforming.
Reading and math results average to the 57th percentile among comparable California schools.
55.6% of students met California's reading standard, but it is trending down slightly.
Math is weaker: 24.8% of students met California's math standard, but it is trending up.
Proficiency stats
| Current Reading Proficiency | 55.6% |
| Current Math Proficiency | 24.8% |
| Reading State Rank | 694/1,596 (57th percentile) |
| Math State Rank | 680/1,596 (57th percentile) |
School information
| Student / Teacher Ratio | 26:1 |
| Student enrollment (2024–25) | 2,109 |
| Low-Income Students | 1,560 (74.0%) |
| English Learners | 191 (9.1%) |
School Website
Great Schools
Niche
Ed-Data
CAASPP| Admissions | Open enrollment |
|---|---|
| Charter school | No |
| Magnet school | No |
Test score trends
Reading rose 1.9 points from last year and fell 2.7 points over the full period. Math rose 3.9 points from last year and rose 5.9 points over the full period.
•Math +5.9 percentage points (2024–2026)Reading Proficiency Scores
2026 state test results
Race and Ethnicity
Filipino and Asian students have the strongest results.
Distribution of Scores by Grade
55.6% of tested students meet the reading standard in the grade shown. Overall, the school’s reading results rank in the top 44% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 13.5-point reading income gap is narrower than the 14.7-point gap at a typical California 9–12 school. It widened over the period shown.
•English Learners vs English Native
3.9% of English learners meet the reading standard, compared with 56.4% of English-only students. The gap narrowed as English-learner results rose and English-only results fell.
•Math Proficiency Scores
2026 state test results
Race and Ethnicity
Asian students have the strongest math results at about 63% proficiency. The other reported groups range from about 12% to 46%.
Distribution of Scores by Grade
24.8% of tested students meet the math standard in the grade shown. Overall, the school’s math results rank in the top 43% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 14.3-point math income gap is about the same as the 14.2-point gap at a typical California 9–12 school. It widened over the period shown.
•English Learners vs English Native
7.4% of English learners meet the math standard, compared with 24.1% of English-only students. The gap widened as English-learner results rose and English-only results rose.
•How we compare income gaps
“Typical” means the median gap across 876 schools for reading and 882 for math. The comparison uses 2026 California 9–12 schools with at least 20 tested students in each income group and a reported low-income student population. Each school counts once. Its gap is non-low-income proficiency minus low-income proficiency, including negative gaps. California state test data
Understanding this school
How does Colony High compare within the district?
Colony High is No. 7 in reading and No. 8 in math proficiency among the 10 9–12 schools in Chaffey Joint Union High with 2026 results.
Explore the district’s schoolsHow does Colony High rank in California?
Colony High ranks No. 694 of 1,596 in reading and No. 680 of 1,596 in math for 2026. These proficiency rankings compare California schools in the same grade-level category.
How do low-income students at Colony High compare within the district?
Low-income students here rank No. 9 in both subjects among 10 9–12 district schools with reportable 2026 results for this group. 52.3% meet the reading standard and 21.3% meet the math standard.
See results by student groupHow does Colony High compare with other schools in Ontario?
Colony High is No. 2 in reading and No. 3 in math proficiency among the 5 9–12 schools in Ontario with 2026 results.
Explore schools in OntarioHow does Colony High compare with other schools in San Bernardino County?
Colony High is No. 28 in reading and No. 26 in math proficiency among the 56 9–12 schools in San Bernardino County with 2026 results.
Explore schools in San Bernardino CountyWhich schools should I compare?
Schools serving 9–12 in the same district.
| School | Math | Reading |
|---|---|---|
| Colony HighThis school | 24.8% | 55.6% |
| Chaffey District Online High | 77.1% | 77.8% |
| Chaffey High | 22.1% | 53.2% |
