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Elementary Schools in Diamond Bar, California: Diamond Bar schools aren't just reaching proficiency — they're pushing students beyond it.

Above Average2024–25 data7 schools · avg 64.8/100

Diamond Bar, California has 7 ranked elementary schools with an average Scope Score of 64.8/100 — 20.0 points above the state average of 44.8. The highest-scoring school is Maple Hill Elementary at 78/100, where 60.6% of students exceed the state standard on the 2025 CAASPP assessment. Diamond Bar schools average 42.3% exceeded standard (state: 21.3%) — this exceeded-vs-met distinction reveals whether schools push students beyond proficiency or pace toward it. Of 7 schools, 3 High Ceiling stand out for their performance profiles. Chronic absenteeism averages 9.6% (below the state average of 17.9%). Data source: California Department of Education CAASPP 2025, analyzed by SchoolScope.

Avg Scope Score
64.8
State avg: 44.8
SchoolScope composite
Score Range
38.7
39.8 – 78.4
Avg Exceeded %
42.3%
State avg: 21.3%
CDE CAASPP 2025
Chronic Absenteeism
9.6%
State avg: 17.9%
CDE Attendance 2025
Schools Ranked
7
With Scope Scores
LevelSchoolsAvg ScoreExceededvs State
Elementary7Solid
64.8/100
42.3%+20.0
High1Strong
74.0/100
46.3%+30.3
Middle1Strong
82.6/100
58.3%+40.0

How Diamond Bar schools compare

Diamond Bar has 7 ranked elementary schools with an average Scope Score of 64.8/100 — 20.0 points above the state average of 44.8 (CDE CAASPP 2025).

The top-ranked school is Maple Hill Elementary with a Scope Score of 78 and 60.6% of students exceeding standard.

These schools are pushing students past the bar, not just to it. Diamond Bar schools average 42.3% exceeding standard — well above the statewide average of 21.3%.

Chronic absenteeism in Diamond Bar averages 9.6% — below the state average of 17.9%.

How we score · Weighted composite of test performance, growth, and school climate · Full weights on the methodology page

School archetypes in Diamond Bar

3 High Ceiling2 Strong All-Around2 Building Momentum

Archetypes are data-driven labels based on Scope Score dimensions. Learn more

For the data nerds

Every school in Diamond Bar

ranked by Scope Score · 2024–25 CAASPP

#SchoolExceededScore
1Chaparral Middle
Walnut Valley Unified High Ceiling
58.3%Strong
83/100
2Maple Hill Elementary
Walnut Valley Unified High Ceiling
60.6%Strong
78/100
3Pantera Elementary
Pomona Unified High Ceiling
52.6%Strong
78/100
4Diamond Bar High
Walnut Valley Unified Strong All-Around
46.3%Strong
74/100
5Evergreen Elementary
Walnut Valley Unified Strong All-Around
47.2%Strong
72/100
6Quail Summit Elementary
Walnut Valley Unified High Ceiling
52.3%Strong
70/100
7Castle Rock Elementary
Walnut Valley Unified Strong All-Around
42.9%Solid
69/100
8Armstrong Elementary
Pomona Unified Building Momentum
21.4%Developing
47/100
9Golden Springs Elementary
Pomona Unified Building Momentum
18.7%Developing
40/100
Source: CDE CAASPP 2025 · 9 schoolsMethodology · Explore all schools

Data source: California Department of Education · CAASPP 2024-25 · Methodology

Scores are SchoolScope's analysis of public data, not official CDE ratings. They represent one way of interpreting test results and should not be the sole basis for school decisions.

Private Schools in Diamond Bar

Private schools don't participate in California's standardized testing (CAASPP) and cannot be scored or ranked. Showing enrollment, student-teacher ratio, and affiliation where available.

Mt. Calvary Lutheran School
Greek Orthodox · Grades Pre-K-8 · 154 students
17:1Private
Guide Academy
Nonsectarian · Grades Pre-K-9 · 38 students
3:1Private
St. Christopher-Joseph-Aquinas Academic Academy
Roman Catholic · Grades Pre-K-6 · 35 students
35:1Private
Diamond Bar Montessori Academy
Nonsectarian · Grades Pre-K-1 · 30 students
10:1Private
Landmark Christian Preschool
Brethren · Grades Pre-K-TK · 26 students
7:1Private
What Scope Scores can't tell you about Diamond Bar

Numbers tell you whether students are clearing the bar. A school visit tells you whether they're happy doing it. These metrics are intentionally missing from the Scope Score: class sizes and student-teacher interaction quality; arts, music, athletics, and enrichment programs; teacher experience and turnover; campus safety and social-emotional support; parent and community engagement; quality of special education and gifted programs; how school zones and enrollment boundaries affect access. Full methodology

Frequently asked questions

Are the schools in Diamond Bar good?
Diamond Bar's 7 ranked elementary schools average a Scope Score of 64.8/100, which is 20.0 points above the state average. 42.3% of students exceed the state standard on average (state average: 21.3%). The Scope Score weights 6 dimensions for elementary schools: exceeded standard (38%), grade 3-to-5 growth (27%), met or exceeded (proficient) (20%), chronic absenteeism (5%), suspension rate (5%), and ELPAC English Learner proficiency (5%). Data source: California Department of Education CAASPP 2025, analyzed by SchoolScope.
What is the best elementary school in Diamond Bar?
The highest-scoring elementary school in Diamond Bar is Maple Hill Elementary with a Scope Score of 78/100 and 60.6% of students exceeding the state standard. Rankings are based on SchoolScope's 2025 Scope Score, which measures academic performance and school climate using publicly available California data. See full methodology.
How do Diamond Bar schools compare to the state average?
Diamond Bar elementary schools average a Scope Score of 64.8/100 — 20.0 points above the state average of 44.8. The exceeded rate averages 42.3% vs. 21.3% statewide. Chronic absenteeism averages 9.6% vs. 17.9% statewide.
How many schools are in Diamond Bar?
Diamond Bar has 7 ranked elementary schools with Scope Scores. Schools are ranked using a weighted composite of CAASPP test performance, growth trajectory, chronic absenteeism, and suspension rate. Schools with insufficient testing data are not ranked.
What does the Scope Score measure?
The Scope Score is SchoolScope's proprietary composite rating (0–100) based on seven dimensions of publicly available California school data: the exceeded-vs-met standard split, overall proficiency, grade 3–5 growth, chronic absenteeism, suspension rate, ELPAC English Learner proficiency, and baseline proficiency. Unlike single-number ratings, the Scope Score separates students who "exceeded" from those who "met" the standard — revealing whether a school pushes students beyond proficiency or paces toward it. Full methodology and weights.

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