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Email BoardChaffey High
1245 North Euclid Avenue, Ontario, CA 91762-1997
Summary
Chaffey High is underperforming.
Reading and math results average to the 52nd percentile among comparable California schools.
53.2% of students met California's reading standard, but it is trending down slightly.
Math is weaker: 22.1% of students met California's math standard, but it is slowly trending up.
Proficiency stats
| Current Reading Proficiency | 53.2% |
| Current Math Proficiency | 22.1% |
| Reading State Rank | 759/1,596 (52nd percentile) |
| Math State Rank | 769/1,596 (52nd percentile) |
School information
| Student / Teacher Ratio | 23:1 |
| Student enrollment (2024–25) | 3,127 |
| Low-Income Students | 2,768 (88.5%) |
| English Learners | 536 (17.1%) |
School Website
Great Schools
Niche
Ed-Data
CAASPP| Admissions | Open enrollment |
|---|---|
| Charter school | No |
| Magnet school | No |
Test score trends
Reading fell 5.6 points from last year and fell 1.5 points over the full period. Math rose 1.6 points from last year and rose 3.4 points over the full period.
•Math +3.4 percentage points (2024–2026)Reading Proficiency Scores
2026 state test results
Race and Ethnicity
Most students in every reported group meet the reading standard. White and Black or African American students have the strongest results.
Distribution of Scores by Grade
53.2% of tested students meet the reading standard in the grade shown. Overall, the school’s reading results rank in the top 48% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 7.9-point reading income gap is narrower than the 14.7-point gap at a typical California 9–12 school. It narrowed over the period shown.
•English Learners vs English Native
3.4% of English learners meet the reading standard, compared with 57.4% 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
White students have the strongest math results at about 41% proficiency. The other reported groups range from about 21% to 25%.
Distribution of Scores by Grade
22.1% of tested students meet the math standard in the grade shown. Overall, the school’s math results rank in the top 49% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 3.6-point math income gap is narrower than the 14.2-point gap at a typical California 9–12 school. It widened over the period shown.
•English Learners vs English Native
8.7% of English learners meet the math standard, compared with 23.4% of English-only students. The gap narrowed 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 Chaffey High compare within the district?
Chaffey High is No. 9 in both reading and math proficiency among the 10 9–12 schools in Chaffey Joint Union High with 2026 results.
Explore the district’s schoolsHow does Chaffey High rank in California?
Chaffey High ranks No. 759 of 1,596 in reading and No. 769 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 Chaffey High compare within the district?
Low-income students here rank No. 8 in both subjects among 10 9–12 district schools with reportable 2026 results for this group. 52.3% meet the reading standard and 21.8% meet the math standard.
See results by student groupHow does Chaffey High compare with other schools in Ontario?
Chaffey High is No. 4 in both reading and math proficiency among the 5 9–12 schools in Ontario with 2026 results.
Explore schools in OntarioHow does Chaffey High compare with other schools in San Bernardino County?
Chaffey High is No. 32 in both reading and 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 |
|---|---|---|
| Chaffey HighThis school | 22.1% | 53.2% |
| Chaffey District Online High | 77.1% | 77.8% |
| Colony High | 24.8% | 55.6% |
