Summary
El Diamante High is a large grades 9–12 school in Visalia, serving 1,890 students in Visalia Unified. Its completion figures are strong: in 2025–26, 98% of students graduated, compared with 88% statewide, and 0.3% dropped out, versus 8.3% statewide. But its academic results show a clear split: English language arts is a strength, while math is the school’s biggest proficiency concern.
In 2025–26, 64% of students were proficient in ELA, 15 points above the state and 17 above the district; among nearby schools with scores, El Diamante ranked third of nine. Math proficiency was 23%, below the state by 15 points and the district by 8, though it also ranked third among those nearby schools. Science was 33%: 3 points below the state and 2 above the district, ranking fifth of nine. Compared with the other two listed Visalia Unified grades 9–12 schools, its ELA result was close to their average, but its math was 4 points lower and science 13 points lower. Those two schools are Redwood High and Mt. Whitney High.
Recent trends are mixed: from 2022–23 to 2025–26, ELA proficiency fell from 70% to 64%, while math edged up from 22% to 23%; the state’s math rate rose from 35% to 38%, widening the school’s deficit. SchoolDigger ranked the school at the 60th percentile with 3 stars in 2025–26, down from the 73rd percentile in 2023–24. Its student-teacher ratio was 21.2 in 2024–25, and 63% of students were free/reduced lunch eligible that year. SchoolDigger’s ranking for effectiveness with Asian students was notably lower than its overall standing: the group ranked at the 13th percentile in 2025–26, down from the 39th percentile in 2023–24. Its special education student ranking also fell, from the 69th percentile in 2023–24 to the 42nd in 2025–26.
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