Castlemont High School is a public high school in Oakland, California, United States, originally known as East Oakland High School. It is part of the Oakland Unified School District. The Castlemont name was selected by a vote of the students. Castlemont High School was founded in 1929 in a medieval-style building.
Serving 719 students in grades 9-12, Castlemont High School ranks in the bottom 50% of all schools in California for overall test scores (math proficiency is bottom 50%, and reading proficiency is bottom 50%).
The percentage of students achieving proficiency in math is ≤5% (which is lower than the California state average of 34%). The percentage of students achieving proficiency in reading/language arts is 10-14% (which is lower than the California state average of 47%).
The student-teacher ratio of 14:1 is lower than the California state level of 21:1.
Minority enrollment is 98% of the student body (majority Hispanic), which is higher than the California state average of 80% (majority Hispanic).
Quick Facts (2026)
- Grades: 9-12
- Enrollment: 719 students
- Student-Teacher Ratio: 14:1
- Minority Enrollment: 98%
- Graduation Rate: 61% (Btm 50% in CA)
- Overall Testing Rank: Bottom 50%
- Math Proficiency: ≤5% (Btm 50%)
- Reading Proficiency: 10-14% (Btm 50%)
- Science Proficiency: 6-9% (Btm 50%)
- Source: National Center for Education Statistics (NCES), CA Dept. of Education
Top Rankings
Castlemont High School ranks among the top 20% of public schools in California for:
Category
Attribute
Percent Eligible For Free Lunch
Student Attention
School Overview
Castlemont High School's student population of 719 students has stayed relatively flat over five school years.
The teacher population of 51 teachers has stayed relatively flat over five school years.
Grades Offered
Grades 9-12
Total Students
719 students
Total Classroom Teachers
51 teachers
Year Founded
1929
Colors
Black, Purple-White
Last Day of School
Tue. Jun 30, 2026
Average Class Size
15 students
School Rankings
Castlemont High School ranks within the bottom 50% of all 9,523 schools in California (based off of combined math and reading proficiency testing data).
The diversity score of Castlemont High School is 0.56, which is less than the diversity score at state average of 0.63. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#9367 out of 9523 schools
(Bottom 50%)
(Bottom 50%)
Math Test Scores (% Proficient)
≤5%
34%
Reading/Language Arts Test Scores (% Proficient)
10-14%
47%
Science Test Scores (% Proficient)
6-9%
29%
Student-Teacher Ratio
14:1
21:1
American Indian
1%
1%
Asian
2%
12%
Hispanic
60%
56%
Black
29%
5%
White
2%
20%
Hawaiian
3%
n/a
Two or more races
3%
6%
All Ethnic Groups
Graduation Rate
61%
87%
Eligible for Free Lunch
97%
54%
Eligible for Reduced Lunch
3%
8%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), CA Dept. of Education
Frequently Asked Questions
What is Castlemont High School's ranking?
Castlemont High School is ranked #9367 out of 9,523 schools, which ranks it among the bottom 50% of public schools in California.
What schools are Castlemont High School often compared to?
Castlemont High Schoolis often viewed alongside schools like Fremont High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
≤5% of students have achieved math proficiency (compared to the 34% CA state average), while 10-14% of students have achieved reading proficiency (compared to the 47% CA state average).
What is the graduation rate of Castlemont High School?
The graduation rate of Castlemont High School is 61%, which is lower than the California state average of 87%.
How many students attend Castlemont High School?
719 students attend Castlemont High School.
What is the racial composition of the student body?
60% of Castlemont High School students are Hispanic, 29% of students are Black, 3% of students are Hawaiian, 3% of students are Two or more races, 2% of students are Asian, 2% of students are White, and 1% of students are American Indian.
What is the student-teacher ratio of Castlemont High School?
Castlemont High School has a student ration of 14:1, which is lower than the California state average of 21:1.
What grades does Castlemont High School offer ?
Castlemont High School offers enrollment in grades 9-12
What school district is Castlemont High School part of?
Castlemont High School is part of Oakland Unified School District.
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