How does Twin Hills Charter Middle compare to other middle schools in Sebastopol?

Twin Hills Charter Middle has a SchoolScope composite score of 57.5/100, placing it at the 85th percentile statewide. 28% of students exceed standard, with a total of 406 students tested across grades and subjects.

What percentage of students exceed standards at Twin Hills Charter Middle?

27.7% of students at Twin Hills Charter Middle exceed the state standard on CAASPP assessments, while 60.1% meet or exceed it. The gap between these two numbers reveals whether the school pushes students beyond basic proficiency.

Is Twin Hills Charter Middle improving or declining?

Based on CAASPP data, Twin Hills Charter Middle's proficiency rate increases by 18.9 percentage points from Grade 6 to grade 8 growth. This suggests the school may be adding value over time.

What is the chronic absenteeism rate at Twin Hills Charter Middle?

17.6% of students at Twin Hills Charter Middle are chronically absent (missing 10% or more of school days). This metric reflects school culture and family engagement, and is weighted at 15% in our composite score.

Twin Hills Charter Middle

Middle School

Twin Hills Union Elementary SebastopolSonoma County95472Charter School

📍 1685 Watertrough Road

Charter school — publicly funded but independently operated. Enrollment is open to all students regardless of neighborhood, typically through a lottery process. Charter schools have more flexibility in curriculum and operations but must meet state academic standards.

Composite Score

out of 100

State Percentile

of middle schools

State Rank

of 1,714 California middle schools

🚀

Growth Engine

A growth engine — students gain measurably more here than at peer schools.

Composite scores are SchoolScope's analysis of public data from the California Dept. of Education (CAASPP, chronic absenteeism, suspension rates). They are not official CDE ratings and should not be the sole basis for school decisions. See methodology.

School overview

Enrollment

207 students

Student-Teacher Ratio

16:1

Free/Reduced Lunch

26%

Teachers

13 full-time

Dashboard indicators

ELA Year-over-Year

Declined

-3.7 pts DFS change

Math Year-over-Year

Increased

+4.0 pts DFS change

Data source: California School Dashboard 2025, ELPAC 2024

Student demographics

Hispanic23.7%

White63.8%

Asian0.5%

Black0.5%

Other11.6%

Performance breakdown

Performance breakdown for Twin Hills Charter Middle
Category	Percentage
Exceeded Standard	27.7%
Met Standard	32.4%
Below Standard	39.9%

What other rankings don't show you

Most rating sites report "60% proficient" for Twin Hills Charter Middle and stop there. Here's what that number hides:

27.7% of students exceeded standard while 32.4% met it. That exceeded rate is 10.4 points above the state average of 17.3%. That's 4.7 points above the Twin Hills Union Elementary district average of 23.0%. Nearby schools (within ~3 miles) average 26.1% exceeded — about the same. The gap between "met" and "exceeded" can reveal how much a school's curriculum challenges students beyond proficiency.

Students here improve by 18.9 percentage points from Grade 6 to grade 8 growth, suggesting the school is adding value beyond what students arrive with.

California's Dashboard shows ELA performance declined and Math increased year-over-year.

Chronic absenteeism is 17.6%, better than the state average of 19.3%.

Why the exceeded vs. met split matters →

How to get into a charter school in LA →