At a glance
Reported students
684
NCES CCD 2024–25
Teachers (FTE)
26.2
NCES CCD 2024–25
Student–teacher ratio
26.1:1
Calculated; not a class-size measure
Grades served
KG–05
NCES preliminary directory 2025–26
School benchmarks
California elementary enrollment
86th percentile
Compared with 5,927 same-level schools reporting enrollment.
District median enrollment
696
Castle Rock Elementary: 684 reported students.
State peer staffing position
92nd percentile
26.1:1 reported; state peer median 22.4:1. Ratio is not class size.
Historical enrollment and staffing · CRDC 2021–22
These older figures are kept separate from 2024–25 statistics and benchmarks. Differences between years can reflect changes in enrollment, staffing, or reporting scope.
- Students
- 666
- Teachers (FTE)
- 29
- Student–teacher ratio
- 23:1
What the reported data says about Castle Rock Elementary
Castle Rock Elementary is a public elementary school serving grades KG–05 in Diamond Bar. It is one of 15 current school records connected to Walnut Valley Unified. NCES reports 684 students for 2024–25.
Among 5,927 elementary schools in California with comparable records, this school is larger than the reported median of 455 students. Its enrollment is at approximately the 86th percentile for that peer group. Size describes the campus, not instructional quality.
The reported student–teacher ratio is 26.1:1, above the California median of 22.4:1 for the same school level. This ratio uses total enrollment and teacher FTE; it is not an average classroom headcount and can be affected by special programs or part-time staffing.
The largest reported race and ethnicity groups are Asian (70.2%) and Hispanic or Latino (19.3%). English learners represent 16.5% of enrollment. Students served under IDEA represent 5%. These figures help families understand who the school serves; they are not rating inputs.
Questions worth asking Castle Rock Elementary
- 1How do the reported 26.1:1 student–teacher ratio and 26.2 teacher FTE translate into actual class sizes by grade?
- 2Which advanced, gifted, career, arts, and computer-science courses are available this year, and how do students qualify?
- 3What counseling support is available today? The school reported 1 counselor FTE in 2021–22.
- 4What meal assistance, transportation, after-school, and family-support services are currently available?
Enrollment needs
- English learners
- 16.5%
- Students with disabilities
- 5%
- Free/reduced-price lunch
- 26.6%
- Lunch program
- Yes participating without using any Provision or the CEO
Reported support staff
- Counselors (FTE)
- 1
- Nurses (FTE)
- 0.33
- Psychologists (FTE)
- 0.8
- Social workers (FTE)
- 0
CRDC 2021–22 full-time-equivalent counts; verify current assignments with the school.
Student demographics
Race and ethnicity share of reported enrollment
- White2.9%
- Hispanic19.3%
- Black1.5%
- Asian70.2%
- American Indian / Alaska Native0.1%
- Native Hawaiian / Pacific Islander0.6%
- Multiracial5.4%
Race/ethnicity: NCES CCD 2024–25. English learner and disability context: CRDC 2021–22. Lunch eligibility: NCES CCD 2024–25. Privacy rules can produce missing values.
Programs reported by the school
Gifted and talented
Not reported as offered
CRDC 2021–22: the AP flag records student enrollment; gifted and computer-science fields describe reported programs/classes. Confirm current courses and eligibility with the school.
Other schools in Walnut Valley Unified
Start with campuses at the same school level or with similar reported enrollment.
Quail Summit Elementary
Elementary · Grades KG–05
696 reported students
Walnut Elementary
Elementary · Grades KG–05
706 reported students
Evergreen Elementary
Elementary · Grades KG–05
709 reported students
Leonard G. Westhoff Elementary
Elementary · Grades KG–05
654 reported students
Vejar Elementary
Elementary · Grades KG–05
631 reported students
Collegewood Elementary
Elementary · Grades KG–05
606 reported students