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Email BoardMt. Diablo Elementary
5880 Mount Zion Drive, Clayton, CA 94517-1114
Summary
Mt. Diablo Elementary is a good school.
Reading and math results average to the 86th percentile among comparable California schools.
70.1% of students met California's reading standard, and it is trending up slightly.
68.9% of students met California's math standard, it is holding steady.
Proficiency stats
| Current Reading Proficiency | 70.1% |
| Current Math Proficiency | 68.9% |
| Reading State Rank | 671/4,657 (86th percentile) |
| Math State Rank | 625/4,657 (87th percentile) |
School information
| Student / Teacher Ratio | 30:1 |
| Student enrollment (2024–25) | 739 |
| Low-Income Students | 155 (21.0%) |
| English Learners | 24 (3.2%) |
School Website
Great Schools
Niche
Ed-Data
CAASPP| Admissions | Open enrollment |
|---|---|
| Charter school | No |
| Magnet school | No |
Test score trends
Reading fell 1.2 points from last year and rose 1.1 points over the full period. Math rose 0.8 points from last year and fell 0.1 points over the full period.
•Math -0.1 percentage points (2024–2026)
Reading Proficiency Scores
2026 state test results
Race and Ethnicity
Most students in every reported group meet the reading standard. Hispanic or Latino and Asian students have the strongest results.
Distribution of Scores by Grade
The share meeting the reading standard ranges from 60.9% to 78.4% across the grades shown. Overall, the school’s reading results rank in the top 15% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 11.4-point reading income gap is narrower than the 19.8-point gap at a typical California K–5 school. It narrowed over the period shown.
•English Learners vs English Native
Results for both language groups are unavailable, so a current reading gap cannot be calculated.
Math Proficiency Scores
2026 state test results
Race and Ethnicity
Two or more races students have the strongest math results at about 79% proficiency. The other reported groups range from about 65% to 76%.
Distribution of Scores by Grade
The share meeting the math standard ranges from 60.0% to 81.1% across the grades shown. Overall, the school’s math results rank in the top 14% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 11.7-point math income gap is narrower than the 20.0-point gap at a typical California K–5 school. It narrowed over the period shown.
•English Learners vs English Native
Results for both language groups are unavailable, so a current math gap cannot be calculated.
Progress as students move up
2023–2026
How we compare income gaps
“Typical” means the median gap across 1,832 schools for reading and 1,839 for math. The comparison uses 2026 California K–5 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 Elementary compare within the district?
Mt. Diablo Elementary is No. 3 in reading and No. 4 in math proficiency among the 29 K–5 schools in Mt. Diablo Unified with 2026 results.
Explore the district’s schoolsHow does Mt. Diablo Elementary rank in California?
Mt. Diablo Elementary ranks No. 671 of 4,657 in reading and No. 625 of 4,657 in math for 2026. These proficiency rankings compare California schools in the same grade-level category.
How do low-income students at Mt. Diablo Elementary compare within the district?
Low-income students here rank No. 3 in reading and No. 2 in math among 29 K–5 district schools with reportable 2026 results for this group. 61.1% meet the reading standard and 59.7% meet the math standard.
See results by student groupHow does Mt. Diablo Elementary compare with other schools in Contra Costa County?
Mt. Diablo Elementary is No. 34 in reading and No. 37 in math proficiency among the 113 K–5 schools in Contra Costa County with 2026 results.
Explore schools in Contra Costa CountyWhich schools should I compare?
Schools serving K–5 in the same district.
| School | Math | Reading |
|---|---|---|
| Mt. Diablo ElementaryThis school | 68.9% | 70.1% |
| Ayers Elementary | 38.5% | 39.8% |
| Bancroft Elementary | 56.0% | 58.9% |
