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What's something Mt. Diablo High does better than most schools?
Community prompt from u/allk12. Replies below.
Enrollment
1,397
High
DISTRICT 824 · STATE 838
SCHOOL COMMUNITY·MT. DIABLO UNIFIED·NCES 062637003960
Mt. Diablo High
2450 Grant St., Concord, CA 94520 · (925) 682-4030 · Contra Costa County
GRADES 09–12HIGH21-SUBURBTITLE IREGULAR SCHOOL1,397 STUDENTS
Student : Teacher
19.8:1
71 FTE teachers
DISTRICT 16.2:1 · STATE 18.2:1
Free / Reduced Lunch
80%
1,118 students
DISTRICT 56% · STATE 65%
Community
6
0 members
Enrollment and student:teacher ratio compared against other high schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Grade 9 | 342 | 24% |
| Grade 10 | 366 | 26% |
| Grade 11 | 355 | 25% |
| Grade 12 | 334 | 24% |
Student demographics
44%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 71% · STATE 62% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
Test scores
CAASPP 2024-25 . % met or exceeded standardEnglish Language Arts
38.1%
CA avg 49.1% . +4.1pp since 2014
Math
12.5%
CA avg 37.7% . -0.5pp since 2014
What this means: On the CAASPP, California's statewide test, about 38 of every 100 students at this school read and write at grade level and about 12 of 100 do math at grade level. Across all California schools, those numbers are about 49 and 38. Reading and writing scores are up about 4 points since 2014, while math scores have held steady.
Performance levels, 2024-25
| Subject | Standard Exceeded | Standard Met | Standard Nearly Met | Standard Not Met |
|---|---|---|---|---|
| English Language Arts | 12.6% | 25.5% | 25.5% | 36.4% |
| Math | 1.8% | 10.7% | 15.3% | 72.2% |
Share of tested students at each CAASPP level. Each student counts in one level, so a row adds to about 100%.
CAASPP results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 38.1% | 12.5% |
| 2023-24 | 32.2% | 10.1% |
| 2022-23 | 37.8% | 12.8% |
| 2021-22 | 27.3% | 9.5% |
| 2020-21 | 48.2% | 23.6% |
| 2018-19 | 36.5% | 14.6% |
| 2017-18 | 50.2% | 20.3% |
| 2016-17 | 45.6% | 17.1% |
| 2015-16 | 36.0% | 14.0% |
| 2014-15 | 34.0% | 13.0% |
% met or exceeded standard, all students and all tested grades.
Source: CAASPP. All students, all grades. See all years and grades →
BeatsExpectations
Demographically-adjusted score · methodologyTier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
23.2%
composite math + reading, all grades
Predicted
32.6%
based on CA schools with similar FRL share
Beats by
-9.4pp
below demographic expectation
What this means: About 23% of students here test proficient in math and reading, compared with the roughly 33% typical for California schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among California's top nor bottom 10%.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →
Schools most like Mt. Diablo High
Mt. Diablo High's state test result (23.2% proficient) is higher than 2 of the 5 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| Mt. Diablo High this school | 1,397 | 80.0% | 23.2% |
| Diamond Ranch High Pomona | 1,542 | 78.7% | 46.4% |
| Tennyson High Hayward | 1,511 | 83.9% | 15.3% |
| Monte Vista High Spring Valley | 1,543 | 76.2% | 38.8% |
| Cobalt Institute of Math and Science Victorville | 1,058 | 80.0% | 60.2% |
| San Lorenzo High San Lorenzo | 1,029 | 81.5% | 17.3% |
Matched among California high schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.
Where Mt. Diablo High ranks
Among high schools| Measure | This school | In California | In Contra Costa County |
|---|---|---|---|
| State test proficiency ranked highest first | 23.2% | #957 of 1,052 | #23 of 28 |
| Math proficiency ranked highest first | 12.5% | #906 of 1,056 ▲ 6 | #23 of 28 ▼ 1 |
| Reading proficiency ranked highest first | 38.1% | #919 of 1,056 ▲ 45 | #24 of 28 no change |
| 3-year test score change ranked biggest gain first | +6.9pp | #269 of 1,044 | #3 of 28 |
| Enrollment ranked largest first | 1,397 | #607 of 2,093 | #16 of 54 |
| Students per teacher ranked fewest first | 19.8:1 | #516 of 1,352 | #14 of 41 |
| Diversity index ranked most diverse first | 44.0% | #783 of 1,351 | #29 of 41 |
| Free and reduced lunch ranked highest share first | 80.0% | #613 of 1,575 | #15 of 45 |
| Enrollment change since 2017-18 ranked fastest growth first | +0.4% | #316 of 327 | #6 of 6 |
Ranked against other public high schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.
4-year change
SY 2020-21 vs SY 2024-25Enrollment
1,397
-170 (-11%) vs 2020
+8% since 1990-91, when it was 1,293
Student : Teacher
19.8:1
was 20.4:1
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 1,397 | 70.6 | 19.8:1 | 80% (1,118) |
| 2023-24 | 1,477 | 74.8 | 19.8:1 | 62% (915) |
| 2022-23 | 1,498 | 79.2 | 18.9:1 | 61% (911) |
| 2020-21 | 1,567 | 77 | 20.4:1 | 66% (1,030) |
| 2017-18 | 1,392 | 64.8 | 21.5:1 | 76% (1,058) |
| 2015-16 | 1,307 | 66 | 19.8:1 | 75% (983) |
| 2010-11 | 1,529 | N/A | N/A | 50% (771) |
| 2000-01 | 1,569 | 75 | 20.9:1 | 45% (699) |
| 1990-91 | 1,293 | 56 | 23.1:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for Mt. Diablo High.
Since 2017-18: students unchanged (1,392 to 1,397); teachers up 9% (64.8 to 70.6).
About Mt. Diablo High
Mt. Diablo High, a high-enrollment high school, is located in Concord, California. The school runs grades 9 through 12 and enrolls 1,397 students. By comparison, high schools in California enroll about 838 students on average.
Mt. Diablo Unified has 29,210 students spread across 50 schools.
At Mt. Diablo High, 74% of students are Hispanic. After that, the student body is 8% Black, 8% Asian, 5% White, and 4% multiracial. Census figures show Contra Costa County is about 28% Hispanic. On the diversity index, which measures the chance that two random students are from different groups, Mt. Diablo High scores 44%.
There are about 19.8 students for every full-time-equivalent teacher at Mt. Diablo High, which has 70.6. High schools in California average 18.2:1, 1.6 fewer students per teacher than here. Free or reduced-price lunch eligibility at Mt. Diablo High is about 80%. On average, public schools in Contra Costa County report 45%.
Test results at Mt. Diablo High are 9.4 points below what its free or reduced-price lunch share predicts (23.2% actual, 32.6% predicted).
The county, Contra Costa County, is where the school is located. The median household earns about $127,229 a year, the share of adults with a bachelor's degree or higher is 45%, and about 6% of people live in poverty. Counting Mt. Diablo High, Contra Costa County has 280 public schools.
The closest school to Mt. Diablo High is Olympic High, located about 0.5 miles away. In all, at least 8 other public schools sit within five miles of Mt. Diablo High. In a group of 4 nearby schools with scores, Mt. Diablo High ranks 2nd on average proficiency.
Mt. Diablo High falls in the Suburb: Large locale category, used for schools in a suburban area outside a principal city, within an urbanized area with a population of 250,000 or more.
By 2024-25, enrollment had dropped to 1,397, from 1,567 in 2020-21.
People who know Mt. Diablo High can post here about homework, tutoring, and testing dates. Parents, students, alumni, and staff are welcome to post.
Contra Costa County at a glance
View full county profilePopulation
1,165,012
Census ACS
Median income
$127,229
Household, ACS
Bachelor's+
45%
Adults 25+
Poverty rate
6%
Below federal line
Schools in county
280
167,423 students
Quick facts
Related schools
Other schools in Mt. Diablo Unified
- College Park HighHigh · 1,948 students
- Northgate HighHigh · 1,546 students
- Concord HighHigh · 1,137 students
- Ygnacio Valley HighHigh · 1,059 students
- Foothill MiddleMiddle · 1,005 students
- Sequoia MiddleMiddle · 882 students
Other schools in Concord
- Clayton Valley Charter HighHigh · 2,373 students
- Concord HighHigh · 1,137 students
- Ygnacio Valley HighHigh · 1,059 students
- El Dorado MiddleMiddle · 861 students
- Meadow Homes ElementaryElementary · 732 students
- Oak Grove MiddleMiddle · 681 students
Nearby schools
- Olympic High0.5 mi · 233
- Crossroads High0.5 mi · 12
- Glenbrook Academy0.9 mi · 21
- Rocketship Futuro Academy0.9 mi · 669
- Holbrook Language Academy0.9 mi · 501
- Floyd I. Marchus1.0 mi · 50
Frequently asked questions
About Mt. Diablo HighHow many students attend Mt. Diablo High?
Mt. Diablo High enrolls approximately 1,397 students in grades 09-12.
Is Mt. Diablo High an elementary, middle, or high school?
Mt. Diablo High is a high school covering grades 09-12.
How many teachers does Mt. Diablo High have?
Mt. Diablo High employs 71 FTE teachers, for a student-to-teacher ratio of 19.8:1.
What is the student diversity at Mt. Diablo High?
Student demographics at Mt. Diablo High are roughly 5% White, 74% Hispanic, 8% Black, 8% Asian, 4% Two or more.
Who oversees Mt. Diablo High?
Mt. Diablo High is overseen by Mt. Diablo Unified in Contra Costa County.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.