Acalanes High

Acalanes High is one of the average-sized high schools in Lafayette, California, run under Acalanes Union High, with 1,256 students on its rolls from grades 9 through 12. Compared to the state average of about 838 students per school, that is 50% bigger than typical.

Acalanes Union High comprises 5 schools with combined enrollment of 5,401 students; Acalanes High is among them.

Looking at the student body, Acalanes High lists that White students make up the majority at 63%; the rest breaks down as 12% Asian, 12% Hispanic, 11% multiracial. By comparison, Contra Costa County as a whole is about 41% White, so the school skews visibly more White than its surroundings.

On the income-and-resources front, On paper, Acalanes High has 64 full-time-equivalent teachers, translating to a class-load average of around 19.5:1. Statewide, the average ratio sits near 18.2:1, putting Acalanes High higher than the state norm the norm. Around 7% of the student body qualifies for free or reduced-price meals, often used as a Title I proxy. Set against Contra Costa County (around 45%), the school's rate is south of typical.

On a residual basis (actual vs predicted given the student mix), Acalanes High performs roughly as the BeatsExpectations model predicts for a school with this FRL share. The predicted value is around 75.2%, the actual is 77.2%, a residual of +2.0 points.

In the broader community, community-level numbers for Contra Costa County indicate the typical household earns roughly $127,229 per year, roughly 45% of adults have completed at least a four-year degree, and census figures put the poverty rate at about 6%. In all, Contra Costa County runs 280 public schools (combined enrollment of about 167,423 students), of which Acalanes High is one.

Nearest neighbor: Springhill Elementary, around 0.3 miles off. Within five miles, there are 8 other public schools. Among the 8 schools in that immediate cluster with test data (this one included), Acalanes High ranks 3rd on composite proficiency, higher than the local average of 73.3%.

The campus sits in a commuter-belt setting.

Looking at the recent track record. Over the past 7-year window, the student count ticked down 9%: 1,377 students in 2018 compared to 1,256 in 2025. The White share of enrollment contracted from 71% to 63% over that span.

Within the allk12 community for this school, recent activity here tends to focus on school events, parent volunteer needs, and clubs. The community welcomes input from current and former families.