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Email BoardMt. Diablo High
2450 Grant Street, Concord, CA 94520-2251
Summary
Mt. Diablo High is badly underperforming.
Reading and math results average to the 28th percentile among comparable California schools.
Only 29.9% of students met California's reading standard, and it is trending down slightly.
Math is weaker: 12.3% of students met California's math standard, but it is trending up slightly.
Proficiency stats
| Current Reading Proficiency | 29.9% |
| Current Math Proficiency | 12.3% |
| Reading State Rank | 1,183/1,596 (26th percentile) |
| Math State Rank | 1,105/1,596 (31st percentile) |
School information
| Student / Teacher Ratio | 20:1 |
| Student enrollment (2024–25) | 1,397 |
| Low-Income Students | 1,126 (80.6%) |
| English Learners | 493 (35.3%) |
School Website
Great Schools
Niche
Ed-Data
CAASPP| Admissions | Open enrollment |
|---|---|
| Charter school | No |
| Magnet school | No |
Test score trends
Reading fell 8.2 points from last year and fell 2.3 points over the full period. Math fell 0.2 points from last year and rose 2.1 points over the full period.
•Math +2.1 percentage points (2024–2026)Reading Proficiency Scores
2026 state test results
Race and Ethnicity
Two or more races and Black or African American students have the strongest results.
Distribution of Scores by Grade
29.9% of tested students meet the reading standard in the grade shown. Overall, the school’s reading results rank No. 1,183 of 1,596 among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 1.4-point reading income gap is narrower than the 14.7-point gap at a typical California 9–12 school. It narrowed slightly over the period shown.
•English Learners vs English Native
3.6% of English learners meet the reading standard, compared with 35.5% of English-only students. The gap narrowed as English-learner results fell and English-only results fell.
•Math Proficiency Scores
2026 state test results
Race and Ethnicity
Asian students have the strongest math results at about 20% proficiency. The other reported groups range from about 11% to 19%.
Distribution of Scores by Grade
12.3% of tested students meet the math standard in the grade shown. Overall, the school’s math results rank No. 1,105 of 1,596 among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 1.6-point math income gap is narrower than the 14.2-point gap at a typical California 9–12 school. It narrowed slightly over the period shown.
•English Learners vs English Native
6.3% of English learners meet the math standard, compared with 13.3% of English-only students. The gap narrowed as English-learner results rose and English-only results fell.
•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 Mt. Diablo High compare within the district?
Mt. Diablo High is No. 5 in both reading and math proficiency among the 5 9–12 schools in Mt. Diablo Unified with 2026 results.
Explore the district’s schoolsHow does Mt. Diablo High rank in California?
Mt. Diablo High ranks No. 1,183 of 1,596 in reading and No. 1,105 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 Mt. Diablo High compare within the district?
Low-income students here rank No. 5 in reading and No. 4 in math among 5 9–12 district schools with reportable 2026 results for this group. 29.7% meet the reading standard and 12.1% meet the math standard.
See results by student groupHow does Mt. Diablo High compare with other schools in Concord?
Mt. Diablo High is No. 4 in both reading and math proficiency among the 4 9–12 schools in Concord with 2026 results.
Explore schools in ConcordHow does Mt. Diablo High compare with other schools in Contra Costa County?
Mt. Diablo High is No. 27 in reading and No. 28 in math proficiency among the 31 9–12 schools in Contra Costa County with 2026 results.
Explore schools in Contra Costa CountyWhich schools should I compare?
Schools serving 9–12 in the same district.
| School | Math | Reading |
|---|---|---|
| Mt. Diablo HighThis school | 12.3% | 29.9% |
| Concord High | 16.6% | 40.1% |
| Ygnacio Valley High | 17.3% | 37.4% |
