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Byron Union Elementary

Elementary school district, grades KG-12 · Contra Costa County

48%of district students met the reading (ELA) standard, 2026
40%met the math standard, 2026
4schools on the map
2,232students enrolled in these schools, 2025-26
$774Kmedian typical home value across school ZIP codes

In spring 2026, 48% of Byron Union Elementary students met the reading standard and 40% met the math standard. In reading, that is 4 points below the Contra Costa County average and about the same as the California average. District reading results in 2026 were 3 points higher than in 2024. Schools in Byron Union Elementary are in Byron, Discovery Bay, Lodi. District boundaries come from the California Department of Education's 2024-25 data; each school's attendance zone is set by the district.

Excelsior Middle: 43% met reading standardDiscovery Bay Elementary: 61% met reading standardTimber Point Elementary: 45% met reading standard
Map of Byron Union Elementary. Dots are schools, colored by the share of students who met the 2026 reading standard (darker is higher). Gray outlines are neighboring districts. Boundaries: California Department of Education, 2024-25.

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District test scores, 2024 to 2026

Share of Byron Union Elementary students who met or exceeded the standard
SubjectSpring 2024Spring 2025Spring 2026Change
Reading (ELA)45%52%48%+3 pts
Math41%44%40%−1 pt

Compared with nearby averages

Spring 2026Reading (ELA)Math
Byron Union Elementary48%40%
Contra Costa County52%43%
California49%38%

Elementary schools

RankSchoolReading (ELA)MathTypical home value (ZIP)
1Discovery Bay ElementaryDiscovery Bay · Grades K-561%61%$774K
2Timber Point ElementaryDiscovery Bay · Grades K-545%40%$774K

Middle schools

RankSchoolReading (ELA)MathTypical home value (ZIP)
1Excelsior MiddleByron · Grades 6-843%30%$840K

K-12 schools

RankSchoolReading (ELA)MathTypical home value (ZIP)
1Vista Oaks Charter CharterLodi · Grades K-1252%33%n/a