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Email BoardCinnabar Charter
286 Skillman Lane, Petaluma, CA 94952-1226
Summary
Cinnabar Charter is badly underperforming.
Reading and math results average to the 26th percentile among comparable California schools.
Only 29.9% of students met California's reading standard, but it is slowly trending up.
Math is weaker: 18.7% of students met California's math standard, but it is slowly trending up.
Proficiency stats
| Current Reading Proficiency | 29.9% |
| Current Math Proficiency | 18.7% |
| Reading State Rank | 1,322/1,734 (24th percentile) |
| Math State Rank | 1,261/1,735 (27th percentile) |
School information
| Student / Teacher Ratio | 15:1 |
| Student enrollment (2024–25) | 156 |
| Low-Income Students | 129 (84.9%) |
| English Learners | 61 (40.1%) |
School Website
Great Schools
Niche
Ed-Data
CAASPP| Admissions | Open enrollment |
|---|---|
| Charter school | Yes |
| Magnet school | No |
Test score trends
Reading fell 0.5 points from last year and rose 4.9 points over the full period. Math rose 2.2 points from last year and rose 3.2 points over the full period. The latest results include grade 8, which was not included in the previous year.
•Math +3.2 percentage points (2024–2026)Reading Proficiency Scores
2026 state test results
Race and Ethnicity
White and Hispanic or Latino students have the strongest results.
Distribution of Scores by Grade
The share meeting the reading standard ranges from 15.8% to 46.2% across the grades shown. Overall, the school’s reading results rank No. 1,322 of 1,734 among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 27.6-point reading income gap is slightly wider than the 25.8-point gap at a typical California 1–8 school. It widened over the period shown.
•English Learners vs English Native
0.0% of English learners meet the reading standard, compared with 41.4% of English-only students. The gap widened as English-learner results fell and English-only results rose.
•Math Proficiency Scores
2026 state test results
Race and Ethnicity
White students have the strongest math results at about 31% proficiency. The other reported groups range from about 17% to 17%.
Distribution of Scores by Grade
The share meeting the math standard ranges from 5.3% to 38.5% across the grades shown. Overall, the school’s math results rank No. 1,261 of 1,735 among California schools in the same grade-level category.
Low-Income vs Non-Low-Income
The 47.7-point math income gap is wider than the 21.8-point gap at a typical California 1–8 school. It widened over the period shown.
•English Learners vs English Native
0.0% of English learners meet the math standard, compared with 31.0% 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 7 schools for reading and 7 for math. The comparison uses 2026 California 1–8 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 Cinnabar Charter rank in California?
Cinnabar Charter ranks No. 1,322 of 1,734 in reading and No. 1,261 of 1,735 in math for 2026. These proficiency rankings compare California schools in the same grade-level category.
How does Cinnabar Charter compare with other schools in Sonoma County?
Cinnabar Charter is No. 2 in both reading and math proficiency among the 2 1–8 schools in Sonoma County with 2026 results.
Explore schools in Sonoma County