Mount Diablo High School is a public high school located in Concord, California, United States. It is the oldest school in the Mount Diablo Unified School District, founded in April 1901. The school currently serves western Concord, the unincorporated communities of Bay Point and Clyde and a portion of Pittsburg.
Serving 1,477 students in grades 9-12, Mt. Diablo 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 9% (which is lower than the California state average of 33%). The percentage of students achieving proficiency in reading/language arts is 27% (which is lower than the California state average of 47%).
The student:teacher ratio of 20:1 is lower than the California state level of 21:1.
Minority enrollment is 96% of the student body (majority Hispanic), which is higher than the California state average of 80% (majority Hispanic).
Quick Stats (2025)
- Grades: 9-12
- Enrollment: 1,477 students
- Student:Teacher Ratio: 20:1
- Minority Enrollment: 96%
- Graduation Rate: 84% (Btm 50% in CA)
- Overall Testing Rank: Bottom 50%
- Math Proficiency: 9% (Btm 50%)
- Reading Proficiency: 27% (Btm 50%)
- Science Proficiency: 14% (Btm 50%)
- Source: National Center for Education Statistics (NCES), CA Dept. of Education
School Overview
Mt. Diablo High School's student population of 1,477 students has stayed relatively flat over five school years.
The teacher population of 75 teachers has stayed relatively flat over five school years.
Grades Offered
Grades 9-12
Total Students
1,477 students
Gender %
Total Classroom Teachers
75 teachers
Year Founded
1901
Colors
Crimson and green
School Calendar
School Rankings
Mt. Diablo High School ranks within the bottom 50% of all 9,602 schools in California (based off of combined math and reading proficiency testing data).
The diversity score of Mt. Diablo High School is 0.44, 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
#8418 out of 9602 schools
(Bottom 50%)
(Bottom 50%)
Math Test Scores (% Proficient)
9%
33%
Reading/Language Arts Test Scores (% Proficient)
27%
47%
Science Test Scores (% Proficient)
14%
29%
Student : Teacher Ratio
20:1
21:1
American Indian
n/a
1%
Asian
8%
12%
Hispanic
74%
56%
Black
8%
5%
White
4%
20%
Hawaiian
2%
n/a
Two or more races
4%
6%
All Ethnic Groups
Graduation Rate
84%
87%
Eligible for Free Lunch
59%
54%
Eligible for Reduced Lunch
3%
8%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), CA Dept. of Education
School Notes
- School Mascot: Danny The Devil
Profile last updated: 02/09/2025
Frequently Asked Questions
What is Mt. Diablo High School's ranking?
Mt. Diablo High School is ranked #8418 out of 9,602 schools, which ranks it among the bottom 50% of public schools in California.
What schools are Mt. Diablo High School often compared to?
Mt. Diablo High Schoolis often viewed alongside schools like Concord High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
9% of students have achieved math proficiency (compared to the 33% CA state average), while 27% of students have achieved reading proficiency (compared to the 47% CA state average).
What is the graduation rate of Mt. Diablo High School?
The graduation rate of Mt. Diablo High School is 84%, which is lower than the California state average of 87%.
How many students attend Mt. Diablo High School?
1,477 students attend Mt. Diablo High School.
What is the racial composition of the student body?
74% of Mt. Diablo High School students are Hispanic, 8% of students are Asian, 8% of students are Black, 4% of students are White, 4% of students are Two or more races, and 2% of students are Hawaiian.
What is the student:teacher ratio of Mt. Diablo High School?
Mt. Diablo High School has a student ration of 20:1, which is lower than the California state average of 21:1.
What grades does Mt. Diablo High School offer ?
Mt. Diablo High School offers enrollment in grades 9-12
What school district is Mt. Diablo High School part of?
Mt. Diablo High School is part of MT. Diablo Unified School District.
School Reviews
Review Mt. Diablo High School. Reviews should be a few sentences in length. Please include any comments on:
- Quality of academic programs, teachers, and facilities
- Availability of music, art, sports and other extracurricular activities
Recent Articles
Parents’ Guide to Special Education
Special education law is not easy to decipher, with several regulations that govern special education services for disabled students. In this article, learn about the core components of the laws, rights, and individual education plans that can help create the best public school environment for your child.
Surveillance Cameras: Violation of Rights or Improved Security?
A school district in Virginia has given the green light to schools that want to install surveillance cameras in common areas like cafeterias and hallways. We’ll look at whether this is a violation of student privacy or the best way to keep order in schools.
Teachers in 19 States Allowed to Physically Punish Students
As of 2014, nineteen states still allow corporal punishment – spanking and paddling the most common choices – in their public schools. However, some argue that not only are these punishments physically harmful, they also are disproportionately administered to students of color. As a result, House democrats have taken up the issue in a new bill that would ban all forms of corporal punishment nationwide.
