Mossdale Elementary, Lathrop CA - Test Scores & Data

Original Research by School Decision on Mossdale Elementary

Mossdale Elementary sits on Brookhurst Boulevard in Lathrop, a fast-growing city in San Joaquin County where logistics, manufacturing, and residential development are reshaping the landscape at a pace that few California cities are matching. The school is part of Manteca Unified and serves kindergarten through eighth grade, which means a child who enrolls in kindergarten can stay through middle school without changing campuses.

The student body is sizable for a K-8 school. Hispanic students make up the largest share of enrollment, followed by Asian students, with white and Black students each representing a smaller portion and the remainder spread across other groups. A majority of students qualify for free or reduced-price lunch, which is the standard federal indicator of economic need. English learner and special education data were not available in what was provided.

On the California Assessment of Student Performance and Progress, math proficiency runs below half across all tested grades, with the lowest rates in the upper elementary and eighth-grade years. English language arts shows a more variable picture: third and fourth grade results sit in roughly the same range as math, but proficiency climbs meaningfully through the middle grades, and by seventh grade more than half of students tested at the proficient or above level. Fifth-grade science proficiency is low; eighth-grade science is somewhat stronger but still below the majority of students. Placed against districts in San Joaquin County, the school's overall proficiency index sits above the midpoint of that county comparison set, which gives some useful local context. Parents who want to understand the specific grade-level results in detail will find those figures in the data sections on this page, and a conversation with the school about supports for students who are not yet meeting grade-level standards would be worthwhile.

One recent district-wide change directly affects families with children in the younger grades here. Manteca Unified switched from traditional A-F letter grades to standards-based report cards for transitional kindergarten through sixth grade beginning in the 2024-25 school year, publicly reported as a district-wide adoption after a prior pilot. Instead of letter grades, families now receive marks like "exceeded," "proficient," "approaching," or "beginning" tied to specific grade-level standards. Seventh and eighth graders keep traditional letter grades. This is a lasting change in how a parent tracks a child's academic progress at Mossdale, and families accustomed to conventional report cards will need to calibrate to a new format for most of the school's grade range.

The broader district context involves active construction. A new K-8 campus called Ethel Allen Elementary is under construction in Lathrop's Mossdale Landing area with a target opening around 2027. For families enrolling in Mossdale now, this could eventually affect attendance boundaries and enrollment levels in the neighborhood. Families buying new homes in Lathrop west of Interstate 5 should also look closely at whether their property carries Mello-Roos or Community Facilities District taxes, which publicly reported accounts describe as carrying a priority enrollment benefit at certain schools; homes without those taxes may face longer bus routes to their assigned campus.

Lathrop itself is genuinely in motion. The River Islands master-planned community is expanding on the city's west side, adding homes, trails, planned transit connections, and its own schools over a multi-decade buildout. Tesla operates a substantial cluster of facilities in the city and is publicly reported as among the largest private-sector employers in the county. Retail and dining have not caught up to the residential growth, and the city is car-dependent by nearly any measure. An Altamont Corridor Express commuter rail station connects toward the Tri-Valley and Bay Area, and a second station is under construction.

Home values in the zip code sit well above the national median but below the California statewide benchmark, and they declined modestly year over year as of the most recent data. Rents moved slightly upward in the same period. The estimated monthly cost of ownership at current mortgage rates represents a stretch relative to national income norms, which is a real consideration for families weighing the area.

A graduation rate is not applicable here because Mossdale does not serve high school grades.

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Academic performance

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

Math

Grade 340%

School 40% · District 26% · ▲ 13 pts above district

▼ 3 pts below state median · ▲ 8 pts above county median

Grade 430%

School 30% · District 24% · ▲ 6 pts above district

▼ 7 pts below state median · ▲ 4 pts above county median

Grade 526%

School 26% · District 20% · ▲ 6 pts above district

▼ 4 pts below state median · ▲ 6 pts above county median

Grade 641%

School 41% · District 22% · ▲ 19 pts above district

▲ 10 pts above state median · ▲ 19 pts above county median

Grade 731%

School 31% · District 21% · ▲ 10 pts above district

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

Grade 822%

School 22% · District 22%

▼ 6 pts below state median · ▼ 1 pts below county median

English language arts

Grade 334%

School 34% · District 26% · ▲ 9 pts above district

▼ 6 pts below state median · ▲ 4 pts above county median

Grade 438%

School 38% · District 27% · ▲ 11 pts above district

▼ 4 pts below state median · ▲ 8 pts above county median

Grade 544%

School 44% · District 35% · ▲ 8 pts above district

▼ 2 pts below state median · ▲ 10 pts above county median

Grade 649%

School 49% · District 32% · ▲ 16 pts above district

▲ 5 pts above state median · ▲ 15 pts above county median

Grade 752%

School 52% · District 39% · ▲ 12 pts above district

▲ 6 pts above state median · ▲ 14 pts above county median

Grade 843%

School 43% · District 40% · ▲ 3 pts above district

▼ 1 pts below state median · ▲ 4 pts above county median

Science

Grade 521%

School 21% · District 20% · ▲ 1 pts above district

▼ 7 pts below state median · ▲ 3 pts above county median

Grade 832%

School 32% · District 19% · ▲ 12 pts above district

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

Social studies

Grade 844%

School 44% · District 41% · ▲ 3 pts above district

▼ 5 pts below state median · ▲ 6 pts above county median

This schoolManteca Unified, 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 3Lower-income28%Higher-income45%17 pp gap

Grade 4Lower-income37%Higher-income40%2 pp gap

Grade 5Lower-income40%Higher-income49%9 pp gap

Grade 6Lower-income43%Higher-income57%15 pp gap

Grade 7Lower-income44%Higher-income61%17 pp gap

Grade 8Lower-income42%Higher-income46%4 pp gap

Mathematics

Grade 3Lower-income33%Higher-income51%18 pp gap

Grade 4Lower-income24%Higher-income42%18 pp gap

Grade 5Lower-income24%Higher-income30%7 pp gap

Grade 6Lower-income44%Higher-income36%9 pp gap

Grade 7Lower-income29%Higher-income33%4 pp gap

Grade 8Lower-income20%Higher-income25%5 pp gap