Average
#4408 of 9,539 schools in CA
Top 46% in state
Castle Rock Elementary
Elementary School · Walnut Valley Unified
2975 Castle Rock Rd., Diamond Bar, CA 91765
Enrollment
691
Student-Teacher
26.6:1
Score
6.6
Grades
Kindergarten – 5th
Enrollment
691
Student-Teacher
26.6:1
Score
6.6
Grades
Kindergarten – 5th
Data vintage
2022-23
Data vintage2022-23
How this school compares
California schools
#4,408 of 9,539
In Diamond Bar
#9 of 10
public schools
In district
#14 of 15
Walnut Valley Unified
Equity
9.1 / 10
Excellent
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Castle Rock Elementary
Elementary School in Diamond Bar · grades Kindergarten – 5th. Start here, then compare fit against nearby and district options.
Prestige Stem Academy
0.5 mi away. Use as a geographic alternative in the same move search.
Kingdom Seed Academy
0.6 mi away. Use as a geographic alternative in the same move search.
About Castle Rock Elementary
Castle Rock Elementary is a public elementary school in Diamond Bar, CA, part of Walnut Valley Unified. Castle Rock Elementary serves approximately 691 students, and covers grades Kindergarten-5th, and has a 26.6:1 student-teacher ratio. Castle Rock Elementary has a current MySchoolScout rating of 6.6 out of 10 and ranks #4,408 of 9,539 schools in CA.
Structured state assessment records for Castle Rock Elementary show 76% math proficiency (multi-year average, 2009-2024) and 73% reading/ELA proficiency (multi-year average, 2009-2024).
- This school 6.6 · Average
- District avg 7.7
- CA avg 6.2
What Parents Should Know
Castle Rock Elementary runs 26.6:1 students to teachers, above the national average. That often means bigger classes. Ask how the school supports kids who need extra help, and whether there are teaching assistants or small-group time.
Score Breakdown
Full Profile · 3/3 metricsView breakdown
View breakdown
View breakdown
Castle Rock Elementary — Students at Castle Rock Elementary score 68% proficient, which is above what's typical for similar communities (expected: 59%).
Equity & Diversity
Shown separately, not included in overall scoreFree/Reduced Lunch
27.5%
Students qualifying for federal meal assistance
Test Scores CA CAASPP (2023-24)
Based on 30 test records from CA state assessments. About our data
Proficiency Trend
↓ DecliningAverage proficiency (% at or above grade level) across Math & ELA over time.
Source: EdFacts (NCES) and state assessment data. Growth score: 6.4/10.
How Castle Rock Elementary Compares
See how Castle Rock Elementary performs across key quality dimensions compared to state benchmarks.
Funding & Resources
Location
2975 Castle Rock Rd., Diamond Bar, CA 91765
Nearby Alternatives
Families considering Castle Rock Elementary may also want to explore other elementary schools in the area. Maple Hill Elementary (rated 8.6/10, 2.0 miles away), which scores notably higher. Another option is Walnut Elementary (rated 8.5/10, 2.1 miles away, in nearby Walnut), which scores notably higher. Additionally, Quail Summit Elementary (rated 8.5/10, 2.4 miles away), which scores notably higher. For more schools in Diamond Bar, see our Diamond Bar schools guide .
Nearby Schools
20 within 2.8 mi| School | Distance | Rating |
|---|---|---|
| Prestige STEM Academy Diamond Bar | 0.5 mi | — |
| Kingdom Seed Academy Diamond Bar | 0.6 mi | — |
| LANDMARK CHRISTIAN PRESCHOOL Diamond Bar | 0.7 mi | — |
| Diamond Bar High Diamond Bar | 0.7 mi | 8.0 |
| Evergreen Elementary Diamond Bar | 0.7 mi | 7.3 |
| South Pointe Middle Walnut | 1.4 mi | 8.4 |
| ST CHRISTOPHER-JOSEPH-AQUINAS ACADEMIC ACADEMY Diamond Bar | 1.7 mi | 5.2 |
| TZU CHI ELEMENTARY SCHOOL Walnut | 1.6 mi | 5.8 |
| Institute of Knowledge Diamond Bar | 1.9 mi | — |
| TZU CHI ELEMENTARY SATOA Walnut | 1.6 mi | 6.1 |
| Maple Hill Elementary Diamond Bar | 2.0 mi | 8.6 |
| DISCOVERY WORLD MONTESSORI Walnut | 2.1 mi | — |
| Walnut Elementary Walnut | 2.1 mi | 8.5 |
| Elite Open School Rowland Heights | 1.9 mi | — |
| Chaparral Middle Diamond Bar | 2.1 mi | 8.4 |
| Shelyn Elementary Rowland Heights | 2.0 mi | 7.9 |
| Ybarra Academy for the Arts and Technology Walnut | 2.1 mi | 6.5 |
| Ron Hockwalt Academies (Continuation) Walnut | 2.6 mi | 5.5 |
| Quail Summit Elementary Diamond Bar | 2.4 mi | 8.5 |
| ALLAIS SCHOOL Walnut | 2.8 mi | 6.5 |
Neighborhood Census ACS (2019-2023)
Census data for ZIP 91765 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$104,737
Median Home Value
$878,900
Median Rent
$2,395/mo
Population
44,779
College Educated
53.3%
Homeownership
77.2%
Avg Commute
34 min
Poverty Rate
10.1%
Median Age
45.7
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| Allen Avenue Elementary San Dimas, CA | 6.6 |
| Altadena Elementary Altadena, CA | 6.6 |
| Anderson (Linford L.) Elementary Dixon, CA | 6.6 |
| Annie R. Mitchell Visalia, CA | 6.6 |
| Arroyo Seco Academy Greenfield, CA | 6.6 |
| Bancroft Elementary Walnut Creek, CA | 6.6 |
Frequently Asked Questions
Common questions about Castle Rock Elementary
What grades does Castle Rock Elementary serve?
Castle Rock Elementary serves students in grades Kindergarten through 5th.
How many students attend Castle Rock Elementary?
Castle Rock Elementary has an enrollment of approximately 691 students.
What is the student-teacher ratio at Castle Rock Elementary?
The student-teacher ratio at Castle Rock Elementary is 26.6:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Castle Rock Elementary rank in CA?
Castle Rock Elementary ranks #4,408 of 9,539 schools in CA.
What is Castle Rock Elementary's MySchoolScout rating?
Castle Rock Elementary has a current MySchoolScout rating of 6.6 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.
What are the test scores at Castle Rock Elementary?
Based on loaded state assessment records, Castle Rock Elementary has 76% math proficiency (multi-year average, 2009-2024) and 73% reading/ELA proficiency (multi-year average, 2009-2024).
Is Castle Rock Elementary a charter school?
No, Castle Rock Elementary is not a charter school. It is a traditional public school operated by the local school district.
Is Castle Rock Elementary a Title I school?
No, Castle Rock Elementary is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Castle Rock Elementary?
27.5% of students at Castle Rock Elementary qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
Neighborhood Context
Powered by 
Quick Facts NCES CCD (SY 2022-23)
- Grades
- Kindergarten – 5th
- Enrollment
- 691
- Student-Teacher Ratio
- 26.6:1
- Teachers (FTE)
- 26
- Free/Reduced Lunch
- 27.5%
- Type
- regular
- Setting
- Large Suburb
- County
- Los Angeles County
- Chronic Absenteeism (SY 2022-23)
- 12.9%
- Phone
- (909) 598-5006
Resources & Links
District
Walnut Valley Unified- District Enrollment
- 13,815
- Schools in District
- 15
- Per-Pupil Spending
- $13,971
- District Rank
- #14 of 15
Other Schools in This District
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