Sunridge Charter, Sebastopol CA - Test Scores & Data

Original Research by School Decision on Sunridge Charter

Sunridge Charter serves kindergarten through eighth grade in Sebastopol, a small wine-country city in Sonoma County. It is one of four schools in the Twin Hills Union Elementary District, and as a charter school it operates under a public school enrollment model within the district's territory.

The school enrolls a small student body, with a notably homogeneous composition: the student population is predominantly white, with smaller shares of students identifying as multiracial, Hispanic, Asian, and Black. A meaningful share of students qualify for free or reduced-price lunch, indicating economic diversity within the broader Sebastopol community. The grade distribution is fairly even across the lower elementary and middle grades, with kindergarten notably larger.

On California's state assessments, Sunridge's performance reflects a mixed picture. In English language arts, the school shows solid ground in the middle grades. Fourth-grade and fifth-grade students are reaching proficiency at respectable levels, and sixth-grade performance is notably strong. Third-grade and eighth-grade results are weaker. Mathematics presents a steeper challenge. Third grade and fifth grade both show low proficiency, eighth grade is below where parents would hope, and while fourth, sixth, and seventh grades show better results, the overall school average in math sits below what Sunridge would want. Science proficiency data is limited to fifth and eighth grades; both show below-average results. The school's overall proficiency index places it above the midpoint among Sonoma County's tested schools, which is a strength worth noting, though this largely reflects strong English language arts performance and masks the mathematics softness.

A parent considering Sunridge should factor that math instruction appears to be an area the school is working with. The data does not reveal whether the school has diagnosed specific challenges or launched targeted intervention, so a parent may want to ask the school directly about how it is addressing the grade-level gaps in math, particularly in grades three, five, and eight. Neither special education enrollment nor English learner enrollment data was available, so the school's capacity to serve students with disabilities or emerging English speakers is not transparent from the data on hand.

The school's smallest cohorts are in grades seven and eight, which reflects typical middle-grade enrollment patterns in small districts. This brings both advantages and constraints: students know one another well, teachers likely teach across subjects, and the school probably feels intimate, but a smaller cohort also means fewer elective choices and less diversity of peer experience as students approach high school.

Sunridge sits in Sebastopol, a progressive, artsy small town at the center of Sonoma Coast wine country. Housing values are substantial, and rent is climbing, reflecting the broader desirability of the Sebastopol area. The downtown is compact and walkable, centered on retail, galleries, restaurants, and a recently revived marketplace called The Barlow. Civic life revolves around parks, trails, and the library. The town is growing modestly, with several housing projects in development aimed at increasing the supply of rentals and affordable units after a period of tight inventory.

The Twin Hills district approved a significant bond measure in June 2026 to address deferred maintenance and modernize facilities across its schools. For a parent, this means property taxes will rise over time to support school infrastructure improvements, but it also signals district commitment to upgrading aging buildings and grounds. This is parent-relevant because facility conditions influence daily school experience and reflect long-term investment in the school communities the district serves.

Sunridge presents as a small, community-minded charter school serving a small, fairly affluent and artistically inclined town. Its strengths lie in elementary English language arts and middle-grade performance there. Mathematics requires attention, particularly in certain grades. The school's small size and demographic composition are traits that will matter differently to different families, neither inherently good nor bad. A parent drawn to an intimate, charter-based approach in a progressive wine-country town, and comfortable with the school's current academic profile, might find Sunridge a good fit. A parent seeking a school with robust math support or serving a broader demographic mix may want to explore other options within the district or beyond.

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Academic performance

How students perform on state tests, by grade, set against the district.

Math

Grade 336%

School 36% · District 45% · ▼ 9 pts below district

▼ 7 pts below state median · ▼ 7 pts below county median

Grade 459%

School 59% · District 47% · ▲ 12 pts above district

▲ 22 pts above state median · ▲ 22 pts above county median

Grade 533%

School 33% · District 39% · ▼ 5 pts below district

▲ 3 pts above state median · ▲ 3 pts above county median

Grade 657%

School 57% · District 46% · ▲ 11 pts above district

▲ 27 pts above state median · ▲ 22 pts above county median

Grade 770%

School 70% · District 60% · ▲ 9 pts above district

▲ 39 pts above state median · ▲ 39 pts above county median

Grade 839%

School 39% · District 58% · ▼ 20 pts below district

▲ 11 pts above state median · ▲ 9 pts above county median

English language arts

Grade 354%

School 54% · District 51% · ▲ 2 pts above district

▲ 13 pts above state median · ▲ 12 pts above county median

Grade 463%

School 63% · District 51% · ▲ 12 pts above district

▲ 21 pts above state median · ▲ 21 pts above county median

Grade 567%

School 67% · District 58% · ▲ 9 pts above district

▲ 21 pts above state median · ▲ 20 pts above county median

Grade 679%

School 79% · District 65% · ▲ 14 pts above district

▲ 35 pts above state median · ▲ 29 pts above county median

Grade 770%

School 70% · District 66% · ▲ 3 pts above district

▲ 24 pts above state median · ▲ 24 pts above county median

Grade 839%

School 39% · District 68% · ▼ 29 pts below district

▼ 6 pts below state median · ▼ 8 pts below county median

Science

Grade 537%

School 37% · District 44% · ▼ 7 pts below district

▲ 9 pts above state median · ▲ 5 pts above county median

Grade 839%

School 39% · District 48% · ▼ 10 pts below district

▲ 13 pts above state median · ▲ 11 pts above county median

Social studies

Grade 872%

School 72% · District 78% · ▼ 6 pts below district

▲ 23 pts above state median · ▲ 13 pts above county median

This schoolTwin Hills Union Elementary, same grade

Graduation rate (ACGR) reflects the federally published Adjusted Cohort Graduation Rate for the most recent year available. We refresh this data annually at the close of each academic year in June. The federal source publishes a banded rate (for example, "90-94%") instead of an exact number for cohorts small enough to risk identifying individual students. The state distribution chart, where shown, plots every school in the state with a published rate or band; schools whose rate is federally suppressed are excluded. Where the federal source publishes a band rather than an exact rate, the school is placed within its band using a stable, ID-derived offset, so its position is consistent across visits.

Proficiency by household income

English language arts

Grade 4Lower-income58%Higher-income67%8 pp gap

Grade 5Lower-income47%Higher-income87%40 pp gap

Mathematics

Grade 4Lower-income58%Higher-income60%2 pp gap

Grade 5Lower-income47%Higher-income20%27 pp gap