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Email BoardCostano Elementary
2695 Fordham Street, East Palo Alto, CA 94303-1207
Summary
Costano Elementary is badly underperforming.
Reading and math results average to the 6th percentile among comparable California schools.
Only 18.0% of students met California's reading standard, but it is quickly trending up.
Math is weaker: 16.1% of students met California's math standard, but it is trending up.
Proficiency stats
| Current Reading Proficiency | 18.0% |
| Current Math Proficiency | 16.1% |
| Reading State Rank | 4,482/4,657 (4th percentile) |
| Math State Rank | 4,275/4,657 (8th percentile) |
School information
| Student / Teacher Ratio | 17:1 |
| Student enrollment (2024–25) | 369 |
| Low-Income Students | 327 (90.1%) |
| English Learners | 192 (52.9%) |
School Website
Great Schools
Niche
Ed-Data
CAASPP| Admissions | Open enrollment |
|---|---|
| Charter school | No |
| Magnet school | No |
Test score trends
Reading rose 1.9 points from last year and rose 11.5 points over the full period. Math rose 4.5 points from last year and rose 7.8 points over the full period.
•Math +7.8 percentage points (2024–2026)Reading Proficiency Scores
2026 state test results
Race and Ethnicity
Black or African American and Hispanic or Latino students have the strongest results.
Distribution of Scores by Grade
The share meeting the reading standard ranges from 10.2% to 29.3% across the grades shown. Overall, the school’s reading results rank No. 4,482 of 4,657 among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 9.3-point reading income gap is narrower than the 19.8-point gap at a typical California K–5 school. It widened over the period shown.
•English Learners vs English Native
5.4% of English learners meet the reading standard, compared with 25.0% of English-only students. The gap widened as English-learner results rose and English-only results rose.
•Math Proficiency Scores
2026 state test results
Race and Ethnicity
Black or African American students have the strongest math results at about 43% proficiency. The other reported groups range from about 11% to 19%.
Distribution of Scores by Grade
The share meeting the math standard ranges from 3.3% to 23.3% across the grades shown. Overall, the school’s math results rank No. 4,275 of 4,657 among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 5.4-point math income gap is narrower than the 20.0-point gap at a typical California K–5 school. It narrowed over the period shown.
•English Learners vs English Native
English-learner math proficiency held steady at 7.5%, while English-only results rose. The gap widened.
Progress as students move up
2023–2026
How we compare income gaps
“Typical” means the median gap across 1,832 schools for reading and 1,839 for math. The comparison uses 2026 California K–5 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 Costano Elementary compare within the district?
Costano Elementary is No. 1 in both reading and math proficiency among the 3 K–5 schools in Ravenswood City Elementary with 2026 results.
Explore the district’s schoolsHow does Costano Elementary rank in California?
Costano Elementary ranks No. 4,482 of 4,657 in reading and No. 4,275 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 Costano Elementary compare within the district?
Low-income students here rank No. 1 in both subjects among 3 K–5 district schools with reportable 2026 results for this group. 16.8% meet the reading standard and 15.4% meet the math standard.
See results by student groupHow does Costano Elementary compare with other schools in East Palo Alto?
Costano Elementary is No. 1 in both reading and math proficiency among the 2 K–5 schools in East Palo Alto with 2026 results.
Explore schools in East Palo AltoHow does Costano Elementary compare with other schools in San Mateo County?
Costano Elementary is No. 64 in reading and No. 67 in math proficiency among the 70 K–5 schools in San Mateo County with 2026 results.
Explore schools in San Mateo CountyWhich schools should I compare?
Schools serving K–5 in the same district.
| School | Math | Reading |
|---|---|---|
| Costano ElementaryThis school | 16.1% | 18.0% |
| Los Robles-Ronald McNair Academy | 8.8% | 6.6% |
| Belle Haven Elementary | 4.5% | 9.2% |
