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Castaic High School

31575 Valley Creek Road, Castaic, CA 91384View on map

  • Public
  • Castaic
  • 294 seniors
  • 1,147 students

Castaic High School is a public high school in Castaic (William S. Hart Union High) with 294 seniors. In fall 2025, 72% of its 47 University of California applicants were admitted, compared with a county median of 76%. Its students applied most often to UC Los Angeles (UCLA), UC Irvine (UCI), and UC San Diego (UCSD). 53% of the class of 2023 completed the A–G courses UC requires.

Year

UC admit rate

72%

34 of 47 applicants, fall 2025

County median 76%

Seniors admitted to a UC

12%

34 of 294 seniors

County median 30%

Seniors who applied to UC

16%

47 of 294 seniors

County median 37%

UC Los Angeles (UCLA) admit rate

11%

4 of 36 applicants, fall 2025

CA applicants 9.6%

UC Berkeley (Cal) admit rate

18%

4 of 22 applicants, fall 2025

CA applicants 13%

Campus by campus, fall 2025

The share of this school's applicants each campus admitted, beside the campus's rate for everyone else. Hardest campus first.

University of California

Castaic High School applicants did better than all California applicants at 4 of 9 campuses, about the same at 2 and worse at 3.

  • Los AngelesAbout the same

    11%

    4 of 36 admitted

    This school11%All CA10%

    Admitted students' average GPA — (all applicants 4.03)

  • Berkeley5 pts higher

    18%

    4 of 22 admitted

    This school18%All CA13%

    Admitted students' average GPA — (all applicants 3.91)

  • Irvine34 pts higher

    56%

    19 of 34 admitted

    This school56%All CA22%

    Admitted students' average GPA 4.18 (all applicants 4.00)

  • San Diego5 pts lower

    20%

    6 of 30 admitted

    This school20%All CA25%

    Admitted students' average GPA 4.27 (all applicants 3.88)

  • Santa BarbaraAbout the same

    35%

    9 of 26 admitted

    This school35%All CA32%

    Admitted students' average GPA 4.24 (all applicants 3.75)

  • Davis16 pts higher

    53%

    10 of 19 admitted

    This school53%All CA37%

    Admitted students' average GPA 4.18 (all applicants 3.87)

  • Santa Cruz21 pts lower

    50%

    7 of 14 admitted

    This school50%All CA71%

    Admitted students' average GPA 4.23 (all applicants 3.80)

  • Riverside9 pts lower

    79%

    11 of 14 admitted

    This school79%All CA87%

    Admitted students' average GPA 4.09 (all applicants 3.82)

  • Merced4 pts higher

    100%

    13 of 13 admitted

    This school100%All CA96%

    Admitted students' average GPA 4.08 (all applicants 4.08)

Fall 2025. A student admitted to several campuses counts once at each one. All CA is the campus’s admit rate that fall for applicants from every California high school. Within 3 points counts as about the same. GPA is the UC-calculated GPA (weighted, capped).

California State University

Castaic High School applicants did better than the campus overall at 1 of 4 campuses, about the same at 1 and worse at 2.

  • San Diego16 pts lower

    18%

    8 of 44 admitted

    This school18%Overall34%

  • Long Beach5 pts lower

    42%

    19 of 45 admitted

    This school42%Overall47%

  • Fullerton13 pts higher

    100%

    18 of 18 admitted

    This school100%Overall87%

  • NorthridgeAbout the same

    95%

    38 of 40 admitted

    This school95%Overall93%

  • Channel Islands

    ~90% · 3 yrs pooled6 applied

Fall 2025. A student admitted to several campuses counts once at each one. Overall is the campus’s admit rate for all its applicants, from federal IPEDS data (fall 2023, the latest published). Within 3 points counts as about the same.

Where graduates go

Class of 2023 (295 graduates), the latest published by fall 2025, within 12 months of graduating.

Any college

77%

227 of 295 graduates

UC or CSU

15%

44 graduates

Community college

50%

148 graduates

DestinationGraduatesShare
UC176%
CSU279%
CA private college83%
Out of state279%
Community college14850%
Not enrolled6823%
Enrolled in college22777%
Total295100%

How each student group compares

Compare college-going across student groups

  • Gender: Male, Female
  • Race & ethnicity: Hispanic or Latino, White, Asian, Filipino, Two or more races
  • Student need: Low-income, Students with disabilities
See the full report

Advanced Placement

16

AP courses offered

2023–24 school year · US Dept. of Education Civil Rights Data Collection

33

AP class sections

Counts every section taught, so it is larger than the number of different AP courses.

40% of students are in AP courses

2024–25 school year · California School Accountability Report Card

44%

of graduating seniors passed at least two AP exams or courses

107 of 245 graduates

A score of 3 or higher on exams or a C- or better in courses. Not comparable with the exam-only share.

2025–26 school year · California Department of Education (College/Career Indicator)

21%

of graduating seniors scored 3 or higher on at least two AP exams

69 of 332 graduates

2023–24 school year · California Department of Education (College/Career Indicator)

Subject areas

  • Computer science: 1 class
  • English: 7 classes
  • Fine and performing arts: 1 class
  • Foreign language: 2 classes
  • Mathematics: 4 classes
  • Science: 8 classes
  • Social science: 10 classes

Academic context

State test (CAASPP), juniors tested in 2026, and the share of low-income students. A–G is the class of 2023. The tick is the county median.

  • Juniors meeting the English standard 71%County median 57%
  • Juniors meeting the math standard 37%County median 27%
  • Juniors exceeding the English standard 42%County median 23%
  • Juniors exceeding the math standard 15%County median 11%
  • Low-income students 36%County median 86%
  • Graduates completing courses 53%County median 64%

Across California

Year
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Other schools in William S. Hart Union High and nearby