Del Mar Middle, Tiburon CA - Test Scores & Data

Original Research by School Decision on Del Mar Middle

Del Mar Middle serves a small cohort of sixth through eighth graders in Tiburon, a waterfront community in Marin County. The school is part of Reed Union Elementary, a district that also operates elementary schools serving the immediate area.

Academically, Del Mar performs above the midpoint among districts in Marin County on an overall proficiency index. In English language arts, the school showed solid performance across all three grades, with seventh grade particularly strong. Mathematics proficiency was slightly lower than ELA, with some variation by grade. Eighth-grade science proficiency fell below the ELA and math numbers. The school's state assessment results reflect what are generally recognized as respectable middle-school proficiency levels, though a parent may want to understand how the school supports students who do not yet meet grade-level standards, particularly in mathematics and science.

The student body is predominantly white, with smaller shares of students identifying as multiracial, Hispanic, Asian, and other groups. A very small share of students qualify for free or reduced-price lunch, which aligns with the economic character of the zip code. Data on students receiving special education services or identified as English learners was not provided.

Housing in the Tiburon zip code is among the most expensive in the region, with home values well above state and national benchmarks. Rental costs are also substantially high, creating a household economic profile where families are typically affluent. This reflects the composition of the school's enrollment.

The district has adopted two significant changes relevant to how families assess the school. Del Mar has moved to standards-based grading, where a student's grade reflects mastery of grade-level standards based on most recent consistent performance rather than averaging work across an entire term. Academic grades are now separated from a citizenship measure called "Habits of Learning." The district also adopted Illustrative Mathematics by Open Up Resources as the core middle-school math curriculum. These are pedagogical and instructional shifts that shape how students experience learning and how families receive information about progress.

The school serves all of Tiburon's middle-grade students in a single, small school. Its location on Avenida Miraflores places it in the residential part of town. Data on course offerings, staffing, and attendance patterns was not available from the sources reviewed, so a parent considering the school would benefit from visiting or contacting the district directly to understand the full range of academic supports, electives, and programs available to middle-grade students.

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Academic performance

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

Math

Grade 678%

School 78% · District 78%

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

Grade 786%

School 86% · District 86%

▲ 56 pts above state median · ▲ 30 pts above county median

Grade 880%

School 80% · District 80%

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

English language arts

Grade 678%

School 78% · District 78%

▲ 34 pts above state median · ▲ 7 pts above county median

Grade 790%

School 90% · District 90%

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

Grade 884%

School 84% · District 84%

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

Science

Grade 872%

School 72% · District 72%

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

Social studies

Grade 881%

School 81% · District 80% · ▲ 1 pts above district

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

This schoolReed 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.