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Email BoardCastle Rock Elementary
2975 Castle Rock Road, Diamond Bar, CA 91765-3420
Summary
Reading and math results average to the 83rd percentile among comparable California schools.
66.0% of students met California's reading standard, but it is trending down slightly.
67.8% of students met California's math standard, it is holding steady.
Proficiency stats
| Current Reading Proficiency | 66.0% |
| Current Math Proficiency | 67.8% |
| Reading State Rank | 884/4,657 (81st percentile) |
| Math State Rank | 680/4,657 (85th percentile) |
School information
| Student / Teacher Ratio | 26:1 |
| Student enrollment (2024–25) | 684 |
| Low-Income Students | 182 (26.6%) |
| English Learners | 146 (21.3%) |
School Website
Great Schools
Niche
Ed-Data
CAASPP| Admissions | Open enrollment |
|---|---|
| Charter school | No |
| Magnet school | No |
Test score trends
Reading fell 5.2 points from last year and fell 1.7 points over the full period. Math fell 2.7 points from last year and rose 0.2 points over the full period.
•Math +0.2 percentage points (2024–2026)
Reading Proficiency Scores
2026 state test results
Race and Ethnicity
Most students in every reported group meet the reading standard. Filipino and Asian students have the strongest results.
Distribution of Scores by Grade
The share meeting the reading standard ranges from 64.2% to 70.1% across the grades shown. Overall, the school’s reading results rank in the top 19% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 13.6-point reading income gap is narrower than the 19.8-point gap at a typical California K–5 school. It widened slightly over the period shown.
•English Learners vs English Native
25.7% of English learners meet the reading standard, compared with 69.3% of English-only students. The gap narrowed as English-learner results rose and English-only results rose.
•Math Proficiency Scores
2026 state test results
Race and Ethnicity
Filipino students have the strongest math results at about 79% proficiency. The other reported groups range from about 47% to 75%.
Distribution of Scores by Grade
The share meeting the math standard ranges from 64.1% to 71.8% across the grades shown. Overall, the school’s math results rank in the top 15% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 14.7-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
42.0% of English learners meet the math standard, compared with 66.5% of English-only students. The gap narrowed as English-learner results rose and English-only results rose.
•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 Castle Rock Elementary compare within the district?
Castle Rock Elementary is No. 8 in reading and No. 7 in math proficiency among the 9 K–5 schools in Walnut Valley Unified with 2026 results.
Explore the district’s schoolsHow does Castle Rock Elementary rank in California?
Castle Rock Elementary ranks No. 884 of 4,657 in reading and No. 680 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 Castle Rock Elementary compare within the district?
Low-income students here rank No. 6 in reading and No. 7 in math among 9 K–5 district schools with reportable 2026 results for this group. 56.5% meet the reading standard and 57.4% meet the math standard.
See results by student groupHow does Castle Rock Elementary compare with other schools in Diamond Bar?
Castle Rock Elementary is No. 4 in both reading and math proficiency among the 4 K–5 schools in Diamond Bar with 2026 results.
Explore schools in Diamond BarHow does Castle Rock Elementary compare with other schools in Los Angeles County?
Castle Rock Elementary is No. 153 in reading and No. 129 in math proficiency among the 780 K–5 schools in Los Angeles County with 2026 results.
Explore schools in Los Angeles CountyWhich schools should I compare?
Schools serving K–5 in the same district.
| School | Math | Reading |
|---|---|---|
| Castle Rock ElementaryThis school | 67.8% | 66.0% |
| Evergreen Elementary | 68.0% | 69.0% |
| Maple Hill Elementary | 79.9% | 82.1% |
