Cobblestone Elementary
1718 Churchill Way, Plumas Lake, CA 95961-9144
Summary
Cobblestone Elementary is underperforming.
Reading and math results average to the 58th percentile among comparable California schools.
Only 48.4% of students met California's reading standard, and it is trending down slightly.
Math is weaker: 43.2% of students met California's math standard, but it is slowly trending up.
Proficiency stats
| Current Reading Proficiency | 48.4% |
| Current Math Proficiency | 43.2% |
| Reading State Rank | 1,974/4,657 (58th percentile) |
| Math State Rank | 1,963/4,657 (58th percentile) |
School information
| Student / Teacher Ratio | 22:1 |
| Student enrollment (2024–25) | 590 |
| Low-Income Students | 262 (44.4%) |
| English Learners | 55 (9.3%) |
School Website
Great Schools
Niche
Ed-Data
CAASPP| Admissions | Open enrollment |
|---|---|
| Charter school | No |
| Magnet school | No |
Test score trends
Reading fell 1.6 points from last year and fell 2.5 points over the full period. Math rose 2.9 points from last year and rose 3.3 points over the full period.
•Math +3.3 percentage points (2024–2026)Reading Proficiency Scores
2026 state test results
Race and Ethnicity
Filipino and White students have the strongest results.
Distribution of Scores by Grade
The share meeting the reading standard ranges from 44.5% to 52.6% across the grades shown. Overall, the school’s reading results rank in the top 43% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 16.4-point reading income gap is narrower than the 19.8-point gap at a typical California K–5 school. It narrowed over the period shown.
•English Learners vs English Native
4.2% of English learners meet the reading standard, compared with 49.0% 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
Filipino students have the strongest math results at about 69% proficiency. The other reported groups range from about 32% to 49%.
Distribution of Scores by Grade
The share meeting the math standard ranges from 28.9% to 57.7% across the grades shown. Overall, the school’s math results rank in the top 43% among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 17.7-point math income gap is narrower than the 20.0-point gap at a typical California K–5 school. It widened over the period shown.
•English Learners vs English Native
0.0% of English learners meet the math standard, compared with 43.8% of English-only students. The gap widened as English-learner results fell and English-only results rose.
•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 Cobblestone Elementary compare within the district?
Cobblestone Elementary is No. 1 in both reading and math proficiency among the 2 K–5 schools in Plumas Lake Elementary with 2026 results.
Explore the district’s schoolsHow does Cobblestone Elementary rank in California?
Cobblestone Elementary ranks No. 1,974 of 4,657 in reading and No. 1,963 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 Cobblestone Elementary compare within the district?
Low-income students here rank No. 1 in both subjects among 2 K–5 district schools with reportable 2026 results for this group. 40.3% meet the reading standard and 34.5% meet the math standard.
See results by student groupHow does Cobblestone Elementary compare with other schools in Plumas Lake?
Cobblestone Elementary is No. 1 in both reading and math proficiency among the 2 K–5 schools in Plumas Lake with 2026 results.
Explore schools in Plumas LakeHow does Cobblestone Elementary compare with other schools in Yuba County?
Cobblestone Elementary is No. 5 in reading and No. 6 in math proficiency among the 11 K–5 schools in Yuba County with 2026 results.
Explore schools in Yuba CountyWhich schools should I compare?
Schools serving K–5 in the same district.
| School | Math | Reading |
|---|---|---|
| Cobblestone ElementaryThis school | 43.2% | 48.4% |
| Rio Del Oro Elementary | 38.0% | 41.1% |
