Is this your school? Email the board to prioritize reading!
Email BoardArmstrong Elementary
22750 Beaverhead Drive, Diamond Bar, CA 91765-1566
Summary
Armstrong Elementary is underperforming.
Reading and math results average to the 39th percentile among comparable California schools.
Only 45.4% of students met California's reading standard, and it is slowly trending down.
Math is weaker: 25.8% of students met California's math standard, and it is quickly trending down.
Proficiency stats
| Current Reading Proficiency | 45.4% |
| Current Math Proficiency | 25.8% |
| Reading State Rank | 2,213/4,657 (52nd percentile) |
| Math State Rank | 3,424/4,657 (26th percentile) |
School information
| Student / Teacher Ratio | 19:1 |
| Student enrollment (2024–25) | 251 |
| Low-Income Students | 165 (67.3%) |
| English Learners | 26 (10.6%) |
School Website
Great Schools
Niche
Ed-Data
CAASPP| Admissions | Unknown |
|---|---|
| Charter school | No |
| Magnet school | No |
Test score trends
Reading fell 2.0 points from last year and fell 5.0 points over the full period. Math fell 3.5 points from last year and fell 15.1 points over the full period.
•Math -15.1 percentage points (2024–2026)Reading Proficiency Scores
2026 state test results
Race and Ethnicity
White and Asian students have the strongest results.
Distribution of Scores by Grade
The share meeting the reading standard ranges from 33.3% to 62.2% across the grades shown. Overall, the school’s reading results rank in the top 48% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 10.7-point reading income gap is narrower than the 17.6-point gap at a typical California K–6 school. It narrowed slightly over the period shown.
•English Learners vs English Native
15.4% of English learners meet the reading standard, compared with 44.3% of English-only students. The gap narrowed as English-learner results fell and English-only results fell.
•Math Proficiency Scores
2026 state test results
Race and Ethnicity
Asian students have the strongest math results at about 50% proficiency. The other reported groups range from about 18% to 20%.
Distribution of Scores by Grade
The share meeting the math standard ranges from 16.0% to 33.3% across the grades shown. Overall, the school’s math results rank No. 3,424 of 4,657 among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 13.8-point math income gap is narrower than the 17.5-point gap at a typical California K–6 school. It narrowed slightly over the period shown.
•English Learners vs English Native
14.3% of English learners meet the math standard, compared with 23.9% of English-only students. The gap narrowed as English-learner results fell and English-only results fell.
•Progress as students move up
2023–2026
How we compare income gaps
“Typical” means the median gap across 1,479 schools for reading and 1,483 for math. The comparison uses 2026 California K–6 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 Armstrong Elementary compare within the district?
Armstrong Elementary is No. 4 in reading and No. 5 in math proficiency among the 17 K–6 schools in Pomona Unified with 2026 results.
Explore the district’s schoolsHow does Armstrong Elementary rank in California?
Armstrong Elementary ranks No. 2,213 of 4,657 in reading and No. 3,424 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 Armstrong Elementary compare within the district?
Low-income students here rank No. 4 in reading and No. 8 in math among 17 K–6 district schools with reportable 2026 results for this group. 41.8% meet the reading standard and 21.3% meet the math standard.
See results by student groupHow does Armstrong Elementary compare with other schools in Diamond Bar?
Armstrong Elementary is No. 3 in both reading and math proficiency among the 3 K–6 schools in Diamond Bar with 2026 results.
Explore schools in Diamond BarHow does Armstrong Elementary compare with other schools in Los Angeles County?
Armstrong Elementary is No. 135 in reading and No. 223 in math proficiency among the 275 K–6 schools in Los Angeles County with 2026 results.
Explore schools in Los Angeles CountyWhich schools should I compare?
Schools serving K–6 in the same district.
| School | Math | Reading |
|---|---|---|
| Armstrong ElementaryThis school | 25.8% | 45.4% |
| Golden Springs Elementary | 41.8% | 57.0% |
| Pantera Elementary | 80.9% | 82.4% |
