The top reported proficiency rate is 45% in English language arts. The lowest is 40% in Science.
Original Research by School Decision on Twin Oaks Elementary
Twin Oaks Elementary is a regular public school serving kindergarten through fifth grade in San Marcos, a college town anchored by California State University San Marcos in North County San Diego, about a short drive inland from the coast along the SR 78 corridor. The school sits in a neighborhood with moderate housing values and supports students from families with varied income levels; nearly half of its students qualify for free or reduced-price lunch.
The student body is predominantly Latino, reflecting the broader San Marcos demographic, with a smaller white population and smaller Asian enrollment. The school enrolls a mid-sized population with fairly balanced grades across the band, slightly larger in the primary grades. Data on English learner enrollment and special education identification were not available, so a parent may want to ask the school directly about these support structures and how Twin Oaks serves multilingual learners or students with individual education plans.
Twin Oaks' academic performance on California's state assessments shows weaker results in both English language arts and math. In ELA, proficiency rates across grades three through five range from about one-third in third grade to about three-fifths in fifth grade, with an overall rate below half. Math proficiency is similar or slightly lower, ranging from about one-third in fourth grade to near half in fifth grade, with an overall rate also below half. In fifth-grade science, measured by the state science test, about two-fifths of students were proficient. These results place Twin Oaks above the midpoint among schools tested within San Diego County, which means the proficiency index across subjects falls in the upper half of the county's schools, but absolute proficiency levels remain moderate. Only one year of state testing data was available, so trend information was not present.
San Marcos itself is in a period of substantial residential and commercial growth centered on North City, a large mixed-use development adjacent to the CSU campus, which is reshaping the city as a walkable downtown with pedestrian-oriented districts and new housing. Some older San Marcos neighborhoods remain more car-dependent suburban in form, while newer planned communities are clustering daily essentials within walking distance. The housing market in the ZIP code where Twin Oaks sits reflects North County pricing, with monthly rents and home values well above the national benchmark; for a renter, housing costs run near half of median household income. A homebuyer with a conventional mortgage would face costs running above half of median income as well, making housing affordability a real constraint for many families in the area.
The San Marcos Unified School District, Twin Oaks' parent district, is investing in facility modernization. In November 2024, voters approved a school improvement bond that will fund replacement of aging portable classrooms, removal of hazardous materials, and reconstruction of high-need school sites; homeowners in the district will see a property tax increase to support these upgrades over the coming years. The district is also implementing a new curriculum requirement: beginning with the graduating class of 2030, all students must pass an ethnic studies course to earn a diploma, a shift aligned with California's statewide graduation mandate and one the district has been piloting across its high schools.
A parent considering Twin Oaks should weigh the school's moderate test proficiency, the cost of housing in the area, the ongoing property tax increase from the bond, and the trajectory of San Marcos' growth. The school serves a community-oriented neighborhood and is part of a district making intentional choices about facility investment and curriculum breadth. A family relocating to the area or already in the neighborhood would benefit from conversations with the school about language support, special needs services, and instructional approaches to building proficiency.
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