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Castle Rock Elementary

Q: Is Castle Rock Elementary a good school?

Castle Rock Elementary ranks 847 th of 5817 California elementary schools. SchoolDigger rates this school 4 stars out of 5.

Public Grades K-5

847^th

SchoolDigger Rank ?

of 5,817 California Elementary Schools

Better than 85% of California elementary schools

Summary

Castle Rock Elementary serves 684 students in grades K–5 in Diamond Bar, California, within Walnut Valley Unified. Its 2025–2026 results were above California averages in English language arts (ELA), math and science. The most important local finding is that it had the lowest all-grades results in all three subjects among the five nearby same-district K–5 schools.

Math is Castle Rock’s strongest subject against broader benchmarks, while science is its largest gap against nearby peers. In 2025–2026, the school scored 68% in math, 29 points above the state, but 5 points below the district and 7 below the nearby peers’ 75% average. Its ELA score was 66%—17 points above the state, 10 below the district and 7 below peers’ 73% average. In science, it scored 52%, 16 points above the state but 11 below the district and 13 below peers’ 66% average. ELA results also point to a concern in the upper tested grades: grades 4 and 5 were both below the schoolwide result, and the school ranked lowest among the five peers in each grade.

Scores have fallen since 2022–2023: ELA declined 8 points, math 2 and science 6, even as state results rose and the school’s lead over the state narrowed. SchoolDigger ranks Castle Rock at the 85th percentile statewide and gives it four stars; the district ranks at the 94th percentile with five stars, and the five nearby same-district schools rank between the 88th and 96th percentiles. The student–teacher ratio was 26.1 in 2024–2025, and 27% of students were free/reduced lunch eligible that year, within the 25%–29% range among same-district K–5 peers. SchoolDigger’s measure of how well the school serves Asian Students stands out: the group ranked at the 37th percentile in 2025–2026, compared with the school’s overall 85th percentile. For Special Education Students, the 2025–2026 ranking was the 71st percentile, 14 points below the school overall.

684

Students ?

26.1

Student/teacher ratio ?

$16,254

Per pupil spending ?

26.6%

Free/reduced lunch eligible (2024-25) ?

All students in California receive free school meals.

≥ 99%

Kindergartners with all required immunizations (2024-25)

2975 Castle Rock Rd.
Diamond Bar, CA 91765-3420

(909) 598-5006

District: Walnut Valley Unified

Students who attend Castle Rock Elementary usually attend:

Middle:	South Pointe Middle
High:	Diamond Bar High

Racial breakdown:

Asian:

70.2%

Hispanic:

19.3%

Two or more races:

5.4%

See top rated California elementary schools

Compare Castle Rock Elementary to nearby elementary schools!

At a glance

▼ Ranking trend: Declining — 90th percentile in 2015 → 85th in 2026

Strengths

✓Test scores above the California average (64% vs 42% meeting standards)

✓Ranks in the top 15% of California elementary schools

Worth a look

!Ranking has slipped — down 5 percentile points since 2015

!Some student groups rank well below the school's overall statewide standing

!Near the bottom of Walnut Valley Unified's ranking

Students meeting standards (2025-2026) ?

This school64%

District avg72%

California avg42%

847^th of 5,817

California public elementary schools ?

Top 15%▼ down 8 pts since 2016

From top 6% (2016) to top 15% (2026)

See the entire ranking list of California Elementary Schools →

★★★★★

SchoolDigger rating ?

7^th of 9Elementary Schools in the Walnut Valley Unified

81^st of 1,530Walnut Valley Unified among California districts

Statewide rank percentile over time (100 = the top-ranked school in the state; click a legend item to add a student group)

Show full rank history (all student groups)

All Students

Year	Avg score	Statewide rank	California percentile	Rating
2026	86.3	847 of 5817	85.4%	★★★★☆
2025	90.9	613 of 5857	89.5%	★★★★☆
2024	88.4	791 of 5869	86.5%	★★★★☆
2023	91.9	577 of 5859	90.2%	★★★★★
2022	92.0	596 of 5883	89.9%	★★★★☆
2019	89.4	675 of 5789	88.3%	★★★★☆
2018	89.0	684 of 5662	87.9%	★★★★☆
2017	90.6	600 of 5692	89.5%	★★★★☆
2016	94.4	349 of 5614	93.8%	★★★★★
2015	91.2	556 of 5611	90.1%	★★★★★
2013	92.0	329 of 5530	94.1%	★★★★★
2012	87.7	569 of 5390	89.4%	★★★★☆
2011	91.0	382 of 5377	92.9%	★★★★★
2010	91.1	387 of 5314	92.7%	★★★★★
2009	91.2	405 of 5193	92.2%	★★★★★
2008	84.9	755 of 5113	85.2%	★★★★☆
2007	82.6	869 of 5113	83.0%	★★★★☆
2006	81.0	923 of 4818	80.8%	★★★★☆
2005	83.5	789 of 4822	83.6%	★★★★☆
2004	80.1	882 of 4809	81.7%	★★★★☆

Asian

Year	Avg score	Statewide rank	California percentile	Rating
2026	47.4	766 of 1210	36.7%	★★☆☆☆
2025	57.2	660 of 1203	45.1%	★★☆☆☆
2024	54.8	690 of 1205	42.7%	★★☆☆☆
2023	60.0	607 of 1190	49.0%	★★☆☆☆
2022	62.4	552 of 1154	52.2%	★★★☆☆
2019	62.3	514 of 1149	55.3%	★★★☆☆
2018	61.9	521 of 1071	51.4%	★★★☆☆

Disabled

Year	Avg score	Statewide rank	California percentile	Rating
2022	55.8	691 of 2227	69.0%	★★★☆☆
2019	58.0	770 of 2585	70.2%	★★★★☆

English Language Learner

Year	Avg score	Statewide rank	California percentile	Rating
2024	79.2	250 of 3162	92.1%	★★★★★
2023	76.9	324 of 3245	90.0%	★★★★★
2022	79.8	299 of 3311	91.0%	★★★★★
2019	96.6	72 of 3275	97.8%	★★★★★

Female

Year	Avg score	Statewide rank	California percentile	Rating
2026	85.7	784 of 5581	86.0%	★★★★☆
2025	91.9	454 of 5597	91.9%	★★★★★
2024	88.4	697 of 5612	87.6%	★★★★☆
2023	87.8	752 of 5609	86.6%	★★★★☆
2022	90.0	636 of 5635	88.7%	★★★★☆
2019	85.2	809 of 5492	85.3%	★★★★☆
2018	85.7	790 of 5413	85.4%	★★★★☆

Hispanic

Year	Avg score	Statewide rank	California percentile	Rating
2026	79.5	718 of 5094	85.9%	★★★★☆
2025	73.3	1044 of 5107	79.6%	★★★★☆
2024	68.6	1252 of 5107	75.5%	★★★★☆
2023	79.6	751 of 5087	85.2%	★★★★☆
2022	88.6	409 of 5084	92.0%	★★★★★
2019	60.9	1637 of 4963	67.0%	★★★☆☆
2018	57.4	1765 of 4830	63.5%	★★★☆☆

Low Socio Economic Status

Year	Avg score	Statewide rank	California percentile	Rating
2026	85.6	533 of 5423	90.2%	★★★★★
2025	94.6	189 of 5460	96.5%	★★★★★
2024	90.1	447 of 5517	91.9%	★★★★★
2023	95.9	164 of 5363	96.9%	★★★★★
2022	95.0	182 of 5264	96.5%	★★★★★
2019	90.7	280 of 5173	94.6%	★★★★★
2018	85.8	461 of 5084	90.9%	★★★★★

Male

Year	Avg score	Statewide rank	California percentile	Rating
2026	84.0	856 of 5603	84.7%	★★★★☆
2025	87.5	717 of 5628	87.3%	★★★★☆
2024	85.7	842 of 5643	85.1%	★★★★☆
2023	92.0	503 of 5638	91.1%	★★★★★
2022	91.8	524 of 5663	90.7%	★★★★★
2019	90.2	570 of 5510	89.7%	★★★★☆
2018	89.0	629 of 5431	88.4%	★★★★☆

Special Education

Year	Avg score	Statewide rank	California percentile	Rating
2026	58.7	840 of 2927	71.3%	★★★★☆
2025	55.4	898 of 2847	68.5%	★★★☆☆
2024	59.6	732 of 2635	72.2%	★★★★☆

How student groups rank statewide ? (each group's percentile vs the same group at other schools — higher is better; the +/- beside each compares the group with this school's overall percentile)

English Language Learner (2024)92nd percentile+6 vs school

Low Socio Economic Status (2026)90th percentile+5 vs school

Female (2026)86th percentile~ school

Hispanic (2026)86th percentile~ school

Male (2026)85th percentile~ school

Special Education (2026)71st percentile-14 vs school

Disabled (2022)69th percentile-21 vs school

Asian (2026)37th percentile-49 vs school

By subject vs California (2025-2026) ?

Mathematics68%+29 vs state

English Language Arts/Literacy66%+17 vs state

Science52%+16 vs state

★

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Schools Near Castle Rock Elementary

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Ranking:

E Elementary M Middle H High A Alternative P Private

Choose columns to see: Summary School Students/Teachers Ranking Test Scores Vaccination Finance All

School													Students/Teachers											Ranking (2026)				Ranking (2025)				CAST Science (2026)			Smarter Balanced Assessments English Language Arts/Literacy (2026)							Smarter Balanced Assessments Mathematics (2026)							Vaccination (2024-25)		Per Pupil Expenditures (2025)
Name	Type	Grades	Address	City	Zip	County	District	Is Charter	Is Magnet	Is Virtual	Is Title I	Phone	Enrollment	Full-time Teachers	Student/ Teacher Ratio	Free/reduced lunch (2024-25)	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2026)	Statewide Rank (2026)	State Percentile (2026)	SchoolDigger Rating (2026)	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	Rank Change from Previous Year	CAST Science 5th Grade	CAST Science 8th Grade	CAST Science All Grades	Smarter Balanced Assessments English Language Arts/Literacy 3rd Grade	Smarter Balanced Assessments English Language Arts/Literacy 4th Grade	Smarter Balanced Assessments English Language Arts/Literacy 5th Grade	Smarter Balanced Assessments English Language Arts/Literacy 6th Grade	Smarter Balanced Assessments English Language Arts/Literacy 7th Grade	Smarter Balanced Assessments English Language Arts/Literacy 8th Grade	Smarter Balanced Assessments English Language Arts/Literacy All Grades	Smarter Balanced Assessments Mathematics 3rd Grade	Smarter Balanced Assessments Mathematics 4th Grade	Smarter Balanced Assessments Mathematics 5th Grade	Smarter Balanced Assessments Mathematics 6th Grade	Smarter Balanced Assessments Mathematics 7th Grade	Smarter Balanced Assessments Mathematics 8th Grade	Smarter Balanced Assessments Mathematics All Grades	Vaccination: Kindergartners with all required immunizations	Vaccination: Exemption rate	Per Pupil Expenditures Total	Sub-total from Federal Funds	Sub-total from State/Local Funds
Castle Rock Elementary	Public	K-5	2975 Castle Rock Rd.	Diamond Bar	91765	Los Angeles County	Walnut Valley Unified	No	(n/a)	No	(n/a)	(909) 598-5006	684	26	26.1	26.6%	20 (2.9%)	10 (1.5%)	132 (19.3%)	480 (70.2%)	1 (0.1%)	4 (0.6%)	37 (5.4%)	86.3	847^th of 5817 public elementary schools	85.4%		90.9	613^th of 5857 public elementary schools	89.5%	234	52.4		52.4	70.1	64.2	64.3				66.0	68.5	71.8	64.1				67.8	≥ 99%		$16,254	$15,832	$422
Evergreen Elementary	Public	K-5	2450 Evergreen Springs Dr.	Diamond Bar	91765	Los Angeles County	Walnut Valley Unified	No	(n/a)	No	(n/a)	(909) 594-1041	709	28	24.9	25.8%	22 (3.1%)	8 (1.1%)	146 (20.6%)	499 (70.4%)	0 (0.0%)	2 (0.3%)	32 (4.5%)	89.1	700^th of 5817 public elementary schools	88.0%		92.2	534^th of 5857 public elementary schools	90.9%	166	61.7		61.7	61.5	68.9	75.5				69.0	71.5	62.5	69.5				68.0	≥ 99%		$15,848	$15,262	$586
Maple Hill Elementary	Public	K-5	1350 Maple Hill Rd.	Diamond Bar	91765	Los Angeles County	Walnut Valley Unified	No	(n/a)	No	(n/a)	(909) 861-6224	556	21	27.1	27.3%	15 (2.7%)	0 (0.0%)	70 (12.6%)	445 (80.0%)	0 (0.0%)	2 (0.4%)	24 (4.3%)	96.3	207^th of 5817 public elementary schools	96.4%		97.1	142^nd of 5857 public elementary schools	97.6%	65	65.4		65.4	80.0	83.8	82.5				82.1	84.6	82.7	72.4				79.9	97%	0%	$16,342	$16,004	$338
Shelyn Elementary	Public	K-6	19500 East Nacora St.	Rowland Heights	91748	Los Angeles County	Rowland Unified	No	(n/a)	No	(n/a)	(909) 444-0584	508	23	21.8	64.0%	13 (2.6%)	2 (0.4%)	108 (21.3%)	352 (69.3%)	2 (0.4%)	2 (0.4%)	29 (5.7%)	88.3	737^th of 5817 public elementary schools	87.3%		77.9	1245^th of 5857 public elementary schools	78.7%	508	53.0		53.0	80.6	71.4	69.8	61.5			70.9	88.2	68.3	54.6	60.3			67.9	98%	0%	$13,720	$13,544	$176
Ybarra Academy for the Arts and Technology	Public	K-8	1300 South Brea Canyon Cutoff Rd.	Walnut	91789	Los Angeles County	Rowland Unified	No	(n/a)	No	(n/a)	(909) 598-3744	630	25	25.0	66.8%	27 (4.3%)	9 (1.4%)	354 (56.2%)	222 (35.2%)	0 (0.0%)	2 (0.3%)	16 (2.5%)	66.9	1736^th of 5817 public elementary schools	70.2%		63.7	1894^th of 5857 public elementary schools	67.7%	158	45.3	39.3	41.8	44.4	56.3	64.6	69.0	60.8	65.5	60.4	39.4	41.5	44.4	57.4	37.1	48.3	44.2	≥ 98%		$15,319	$15,292	$27
Walnut Elementary	Public	K-5	841 South Glenwick	Walnut	91789	Los Angeles County	Walnut Valley Unified	No	(n/a)	No	(n/a)	(909) 594-1820	706	27	25.8	25.2%	8 (1.1%)	2 (0.3%)	104 (14.7%)	550 (77.9%)	0 (0.0%)	2 (0.3%)	40 (5.7%)	93.3	459^th of 5817 public elementary schools	92.1%		94.2	382^nd of 5857 public elementary schools	93.5%	77	63.6		63.6	65.9	69.8	81.0				72.1	82.1	79.0	73.7				78.3	≥ 99%		$17,942	$17,388	$554
Quail Summit Elementary	Public	K-5	23330 East Quail Summit Dr.	Diamond Bar	91765	Los Angeles County	Walnut Valley Unified	No	(n/a)	No	(n/a)	(909) 861-3004	696	28	25.3	25.0%	22 (3.2%)	11 (1.6%)	112 (16.1%)	517 (74.3%)	0 (0.0%)	0 (0.0%)	34 (4.9%)	95.1	318^th of 5817 public elementary schools	94.5%		95.5	284^th of 5857 public elementary schools	95.2%	34	75.5		75.5	71.7	69.4	82.2				74.8	81.3	76.4	84.2				80.7	≥ 99%		$16,267	$15,780	$487
Killian Elementary	Public	K-6	19100 East Killian St.	Rowland Heights	91748	Los Angeles County	Rowland Unified	No	(n/a)	No	(n/a)	(626) 964-6409	469	17	27.7	78.9%	5 (1.1%)	2 (0.4%)	167 (35.6%)	275 (58.6%)	1 (0.2%)	2 (0.4%)	17 (3.6%)	64	1879^th of 5817 public elementary schools	67.7%		59.7	2081^st of 5857 public elementary schools	64.5%	202	30.0		30.0	43.6	55.6	60.3	55.4			53.9	49.2	56.9	45.7	44.7			48.9	≥ 98%		$12,907	$12,466	$441
Cyrus J. Morris Elementary	Public	K-5	19875 East Calle Baja	Walnut	91789	Los Angeles County	Walnut Valley Unified	No	(n/a)	No	(n/a)	(909) 594-0053	485	18	26.9	28.5%	7 (1.4%)	2 (0.4%)	116 (23.9%)	344 (70.9%)	0 (0.0%)	0 (0.0%)	16 (3.3%)	88.8	711^th of 5817 public elementary schools	87.8%		83.7	981^st of 5857 public elementary schools	83.3%	270	61.5		61.5	61.3	69.1	70.0				67.1	71.8	69.9	64.8				68.7	≥ 98%		$18,557	$17,802	$755
Blandford Elementary	Public	K-6	2601 Blandford Dr.	Rowland Heights	91748	Los Angeles County	Rowland Unified	No	(n/a)	No	(n/a)	(626) 965-3410	643	25	26.2	74.3%	4 (0.6%)	9 (1.4%)	196 (30.5%)	394 (61.3%)	0 (0.0%)	3 (0.5%)	37 (5.8%)	72.2	1476^th of 5817 public elementary schools	74.6%		74.3	1411^th of 5857 public elementary schools	75.9%	65	46.1		46.1	41.8	53.6	59.8	60.5			54.0	51.6	57.0	57.8	60.0			56.6	≥ 98%		$13,738	$13,694	$44

Frequently Asked Questions about Castle Rock Elementary

What district is Castle Rock Elementary in?

Walnut Valley Unified

How many students attend Castle Rock Elementary?

In the 2024-25 school year, 684 students attended Castle Rock Elementary.

What is the racial makeup of Castle Rock Elementary?

Students at Castle Rock Elementary are 70% Asian, 19% Hispanic, 5% Two or more races, 3% White, 1% African American.

What schools do graduates of Castle Rock Elementary attend?

Students who attend Castle Rock Elementary usually go on to attend:

Middle : South Pointe Middle
High : Diamond Bar High

Is Castle Rock Elementary a good school?

Castle Rock Elementary ranks 847^th of 5817 California elementary schools. SchoolDigger rates this school 4 stars out of 5.

Rate Castle Rock Elementary!

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Latest California data All new data »

2013–14 through 2024–25 immunization rates (updated)NewOct 19, 2026

2025–26 attendance data, dropout rates & graduation ratesOct 15, 2026

2025–26 CAST, CSA Spanish & Smarter Balanced Assessments scoresOct 15, 2026

2024–25 school spending dataJul 1, 2026

SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau and the California Department of Education.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.