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Sonora Union High

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At a glance

1010^thof 1,530 California districts▲ 44

Better than 33% of California districts

High 3Grades 9-12

100 School St.
Sonora, CA 95370-5680·(209) 533-8510·All California district rankings →

Statewide performance 2018–2026

2026: better than 34% of districts

Schools

989

Students

Top rankedSonora High896^th of 2,135 California high schools

▲

Biggest riser

Theodore Bird High up 276 spots statewide this year

Compare California districts →See the top-ranked California schools →

Summary:

Sonora Union High includes three high schools serving 989 students: Sonora High and Theodore Bird High serve grades 9–12, while Dario Cassina High serves grades 10–12. The latest comparable school-to-school results are for 11th grade in 2025–2026. The most important finding is that academic results vary sharply: Sonora leads, but science proficiency is below the state at all three schools.

Sonora High is the strongest academic performer, with 11th-grade proficiency of 59% in ELA, 31% in math, and 27% in science. It is 2 points above the state in ELA, 1 point below in math, and 12 points below in science. Its lead over the next-highest school is 18 points in ELA, 22 in math, and 5 in science. Theodore Bird High scores 41% in ELA, 9% in math, and 22% in science; Dario Cassina High is lowest in all three, at 40%, 0%, and 5%. Bird’s graduation rate is 100%, while Cassina’s is 77%; Cassina also reports 89% chronic absenteeism, compared with 18% statewide.

Recent score trends offer a different perspective: Bird’s reported All Grades ELA and science results rose by 18 and 15 points from 2024–2025 to 2025–2026, while math rose by 1 point. Sonora’s ELA fell by 6 points and science by 9, despite a 2-point math gain; Cassina’s ELA rose by 12 points, but math stayed at 0% and science fell by 3. SchoolDigger’s percentile ranking fell from 74 to 58 for Sonora, while Bird and Cassina each rose 17 points, from 13 to 30 and 5 to 22. Context also differs: student-teacher ratios are 22.9 at Sonora, 21.6 at Bird, and 14.1 at Cassina; each school reports free/reduced lunch eligible for school year 2024–2025, at 38%, 57%, and 75%, respectively. Historical All Grades comparisons are not fully grade-matched across schools.

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Ranking:

E Elementary M Middle H High A Alternative P Private

Choose columns to see: Summary School Students/Teachers Ranking Test Scores Finance All

School													Students/Teachers											Ranking (2026)				Ranking (2025)				CAST Science (2026)			Smarter Balanced Assessments English Language Arts/Literacy (2026)		Smarter Balanced Assessments Mathematics (2026)		Per Pupil Expenditures (2025)
Name	Type	Grades	Address	City	Zip	County	District	Is Charter	Is Magnet	Is Virtual	Is Title I	Phone	Enrollment	Full-time Teachers	Student/ Teacher Ratio	Free/reduced lunch (2024-25)	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2026)	Statewide Rank (2026)	State Percentile (2026)	SchoolDigger Rating (2026)	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	Rank Change from Previous Year	CAST Science 11th Grade	CAST Science 12th Grade	CAST Science All Grades	Smarter Balanced Assessments English Language Arts/Literacy 11th Grade	Smarter Balanced Assessments English Language Arts/Literacy All Grades	Smarter Balanced Assessments Mathematics 11th Grade	Smarter Balanced Assessments Mathematics All Grades	Per Pupil Expenditures Total	Sub-total from Federal Funds	Sub-total from State/Local Funds
Sonora High	Public	9-12	430 North Washington St.	Sonora	95370	Tuolumne County	Sonora Union High	No	(n/a)	No	(n/a)	(209) 532-5511	880	38	22.9	38.3%	542 (61.6%)	9 (1.0%)	206 (23.4%)	18 (2.0%)	15 (1.7%)	1 (0.1%)	85 (9.7%)	56.2	896^th of 2135 public high schools	58.0%		67.9	638^th of 2162 public high schools	70.5%	258	26.8		26.5	59.2	59.2	31.0	31.0	$12,067	$264	$11,803
Dario Cassina High	Public	10-12	251 South Barretta St.	Sonora	95370	Tuolumne County	Sonora Union High	No	(n/a)	No	(n/a)	(209) 532-1587	44	3	14.1	75.0%	30 (68.2%)	0 (0.0%)	9 (20.5%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	4 (9.1%)	18.9	1671^st of 2135 public high schools	21.7%		15.6	1784^th of 2162 public high schools	17.5%	113	5.0		5.0	40.0	40.0	0.0	0.0	$24,380	$6,158	$18,222
Theodore Bird High	Public	9-12	251 South Barretta St.	Sonora	95370	Tuolumne County	Sonora Union High	No	(n/a)	No	(n/a)	(209) 533-2923	65	3	21.6	56.9%	49 (75.4%)	0 (0.0%)	8 (12.3%)	0 (0.0%)	1 (1.5%)	1 (1.5%)	3 (4.6%)	29.6	1486^th of 2135 public high schools	30.4%		16.3	1762^nd of 2162 public high schools	18.5%	276	21.7		21.7	40.9	40.9	8.7	8.7	$7,383	$1,097	$6,286

Districts nearby

District	Distance	# of Schools	Statewide Rank
Tuolumne County Superintendent of Schools	0.85 mi	5
Sonora Elementary	1.12 mi	1	729^th
Jamestown Elementary	3.01 mi	2	1342^nd
Columbia Union	3.04 mi	1	1124^th
Curtis Creek Elementary	4.65 mi	1	1346^th

See the top CA California districts

SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau and the California Department of Education.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.