Enrollment
156
Elementary
DISTRICT 88 · STATE 465
SCHOOL COMMUNITY·CINNABAR ELEMENTARY·NCES 060870000884
Cinnabar Charter
286 Skillman Ln., Petaluma, CA 94952 · (707) 765-4345 · Sonoma County
GRADES KG–08ELEMENTARY23-SUBURBCHARTERTITLE IREGULAR SCHOOL156 STUDENTS
D
allk12 Grade
Scored higher than 12% of California public elementary schools
- DTest scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
- C-Beats expectations How far test scores land above or below what the share of low-income students predicts for a school in this state.
- CThree-year trend Change in reading and math proficiency over the last three test years.
Grades compare a school only with schools in the same state, because every state gives its own test. How grades work · Top-graded California public elementary schools
Student : Teacher
16.4:1
9 FTE teachers
DISTRICT 18.2:1 · STATE 22.3:1
Free / Reduced Lunch
83%
130 students
DISTRICT 74% · STATE 65%
Community
0
0 members
Enrollment and student:teacher ratio compared against other elementary schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Kindergarten | 13 | 8% |
| Grade 1 | 17 | 11% |
| Grade 2 | 20 | 13% |
| Grade 3 | 19 | 12% |
| Grade 4 | 26 | 17% |
| Grade 5 | 20 | 13% |
| Grade 6 | 15 | 10% |
| Grade 7 | 15 | 10% |
| Grade 8 | 11 | 7% |
This year's kindergarten class (13) is 18% larger than its 8th grade class (11).
Student demographics
34%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 34% · STATE 62% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
Test scores
CAASPP 2024-25 . % met or exceeded standardEnglish Language Arts
30.4%
CA avg 49.1% . -6.6pp since 2014
Math
16.5%
CA avg 37.7% . -10.5pp since 2014
What this means: On the CAASPP, California's statewide test, about 30 of every 100 students at this school read and write at grade level and about 17 of 100 do math at grade level. Across all California schools, those numbers are about 49 and 38. Reading and writing scores are down about 7 points since 2014, while math scores are down about 11 points.
Performance levels, 2024-25
| Subject | Standard Exceeded | Standard Met | Standard Nearly Met | Standard Not Met |
|---|---|---|---|---|
| English Language Arts | 11.8% | 18.6% | 30.4% | 39.2% |
| Math | 1.9% | 14.6% | 27.2% | 56.3% |
Share of tested students at each CAASPP level. Each student counts in one level, so a row adds to about 100%.
CAASPP results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 30.4% | 16.5% |
| 2023-24 | 25.0% | 15.5% |
| 2022-23 | 25.7% | 24.8% |
| 2021-22 | 34.0% | 19.7% |
| 2018-19 | 51.4% | 24.2% |
| 2017-18 | 41.8% | 29.1% |
| 2016-17 | 40.5% | 31.2% |
| 2015-16 | 51.0% | 28.0% |
| 2014-15 | 37.0% | 27.0% |
% met or exceeded standard, all students and all tested grades.
Source: CAASPP. All students, all grades. See all years and grades →
BeatsExpectations
Demographically-adjusted score · methodologyTier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
21.1%
composite math + reading, all grades
Predicted
30.7%
based on CA schools with similar FRL share
Beats by
-9.7pp
below demographic expectation
What this means: About 21% of students here test proficient in math and reading, compared with the roughly 31% typical for California schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among California's top nor bottom 10%.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →
Schools most like Cinnabar Charter
Cinnabar Charter's state test result (21.1% proficient) is higher than 0 of the 4 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| Cinnabar Charter this school | 156 | 83.3% | 21.1% |
| Borrego Springs Elementary Borrego Springs | 153 | 82.4% | 23.7% |
| Alvina Elementary Charter Caruthers | 169 | 82.2% | 41.4% |
| Vallecitos Elementary Rainbow | 195 | 81.0% | 38.5% |
| Cambria Grammar Cambria | 202 | 85.1% | 31.1% |
| Transitional Kindergarten Center Los Banos | 166 | 75.9% | N/A |
Matched among California elementary schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.
Where Cinnabar Charter ranks
Among elementary schools| Measure | This school | In California | In Sonoma County |
|---|---|---|---|
| State test proficiency ranked highest first | 21.1% | #4,487 of 5,151 | #70 of 79 |
| Math proficiency ranked highest first | 16.5% | #4,613 of 5,172 ▲ 22 | #71 of 79 ▲ 1 |
| Reading proficiency ranked highest first | 30.4% | #3,951 of 5,172 ▲ 343 | #62 of 79 ▲ 5 |
| 3-year test score change ranked biggest drop first | -3.4pp | #860 of 5,116 | #14 of 79 |
| Enrollment ranked largest first | 156 | #5,503 of 5,915 | #80 of 105 |
| Free and reduced lunch ranked highest share first | 83.3% | #1,846 of 5,625 | #10 of 89 |
| Enrollment change since 2017-18 ranked steepest decline first | -35.8% | #261 of 3,837 | #4 of 50 |
Ranked against other public elementary schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.
4-year change
SY 2020-21 vs SY 2024-25Enrollment
156
-75 (-32%) vs 2020
-42% since 1990-91, when it was 270
Student : Teacher
16.4:1
was 21.0:1
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 156 | 9.5 | 16.4:1 | 83% (130) |
| 2023-24 | 160 | 9.5 | 16.8:1 | 84% (135) |
| 2022-23 | 186 | 9 | 20.7:1 | 67% (124) |
| 2020-21 | 231 | 11 | 21.0:1 | 57% (132) |
| 2017-18 | 243 | 12 | 20.3:1 | 29% (71) |
| 2015-16 | 252 | 11 | 22.9:1 | 69% (175) |
| 2010-11 | 187 | N/A | N/A | 73% (136) |
| 2000-01 | 276 | 15 | 18.4:1 | 31% (85) |
| 1990-91 | 270 | 11 | 24.6:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for Cinnabar Charter.
Since 2017-18: students down 36% (243 to 156); teachers down 21% (12 to 9.5).
About Cinnabar Charter
This page covers Cinnabar Charter, a small elementary school in Petaluma, California. Enrollment is 156 students in 2024-25, and the school serves kindergarten through 8. The average for elementary schools in California is about 465 students, so this school is 66% smaller than average.
Cinnabar Elementary is the district for Cinnabar Charter. It has 2 schools and 176 students.
At Cinnabar Charter, Hispanic students make up 80% of the student body. It is also 15% White and 3% multiracial. Sonoma County's residents are about 30% Hispanic, 50 points below the school's share. The chance that two students picked at random at Cinnabar Charter belong to different racial or ethnic groups, known as the diversity index, is 34%.
With 9.5 full-time-equivalent teachers in 2024-25, the ratio at Cinnabar Charter was 16.4:1. The 22.3:1 average for elementary schools in California is higher than this school's figure. A measure often used for student poverty, free or reduced-price lunch eligibility, stands at 83%. It compares with 51% for public schools in Sonoma County.
allk12 grades Cinnabar Charter a D. The grade compares the school only with California public elementary schools, because each state gives its own test.
Based on its free or reduced-price lunch share, the BeatsExpectations model predicts an average proficiency rate on state tests of 30.7% for Cinnabar Charter. The school posts 21.1%, 9.7 points below the prediction.
Sonoma County census figures show that median household income is about $104,674, roughly 39% of adults have a four-year degree or more, and the share of residents below the poverty line is 5%. Cinnabar Charter is among the 184 public schools in Sonoma County.
Nearby, Cinnabar Elementary is less than a tenth of a mile away. Other public schools within five miles number at least 8. Cinnabar Charter is 8th of 8 nearby schools by average proficiency rate.
Cinnabar Charter falls in the Suburb: Small locale category, used for schools in a suburban area outside a principal city, within an urbanized area with a population under 100,000. NCES lists Cinnabar Charter as a charter school.
Cinnabar Charter saw enrollment fall 32% between 2020-21 and 2024-25. The school's ratio fell from 21.0:1 to 16.4:1 between 2020-21 and 2024-25.
Posts about school safety, transportation, and start times are welcome on this page. Questions from prospective families are welcome too.
Sonoma County at a glance
View full county profilePopulation
485,040
Census ACS
Median income
$104,674
Household, ACS
Bachelor's+
39%
Adults 25+
Poverty rate
5%
Below federal line
Schools in county
184
63,389 students
Quick facts
Related schools
Other schools in Petaluma
- Casa Grande HighHigh · 1,653 students
- Petaluma HighHigh · 1,193 students
- Kenilworth Junior HighMiddle · 812 students
- Heartwood CharterCombined · 739 students
- Mary Collins Charter School at Cherry ValleyElementary · 494 students
- Petaluma Junior HighMiddle · 454 students
Nearby schools
- Cinnabar Elementary0.0 mi · 20
- Mary Collins Charter School at Cherry Valley1.2 mi · 494
- Meadow Elementary1.2 mi · 384
- Corona Creek Elementary1.4 mi · 403
- Wilson Elementary1.5 mi · 235
- Kenilworth Junior High1.6 mi · 812
Frequently asked questions
About Cinnabar CharterWhat is the total enrollment at Cinnabar Charter?
Cinnabar Charter enrolls approximately 156 students in grades KG-08.
Is Cinnabar Charter an elementary, middle, or high school?
Cinnabar Charter is an elementary school covering grades KG-08.
What is the student-teacher ratio at Cinnabar Charter?
The student-to-teacher ratio at Cinnabar Charter is approximately 16.4:1 (9 FTE teachers).
What is the racial breakdown of students at Cinnabar Charter?
At Cinnabar Charter, the student body is approximately 15% White, 80% Hispanic, 1% Black, 3% Two or more.
Is Cinnabar Charter public or private?
Cinnabar Charter is a public K-12 school operated as a charter, overseen by Cinnabar Elementary.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.