Average
#6004 of 9,533 schools in CA
Grossmont High
High School · Grossmont Union High
PO Box 1043, La Mesa, CA 91944
Enrollment
2,079
Student-Teacher
346.5:1
Score
5.8
Grades
9th – 12th
Enrollment
2,079
Student-Teacher
346.5:1
Score
5.8
Grades
9th – 12th
Updated
2022-23
Updated 2022-23
How this school compares
In La Mesa
#12 of 27
public schools
California high schools
#1,289 of 1,892
In district
#6 of 14
Grossmont Union High
Academic performance
7.4 / 10
Strong
About Grossmont High
Grossmont High serves 2,079 students in grades 9-12 in La Mesa, California, operating as a regular public school in San Diego County. With its large enrollment, the school provides a comprehensive high school experience in a suburban setting. The school's academic performance shows mixed results, with strengths in English Language Arts where 61% of students achieve proficiency or above across grade levels.
Mathematics presents opportunities for growth, with 24% of students meeting proficiency standards. These outcomes contribute to the school's MySchoolScout rating of 5.5 out of 10 and a state ranking of #4850 among California's 9566 schools, placing it in the 49th percentile statewide. Grossmont High operates with 6 full-time equivalent teachers serving its substantial student body.
The school's size allows it to offer the breadth of courses and activities typical of large comprehensive high schools, providing students with diverse educational pathways and extracurricular opportunities. The school maintains its position as an established institution within the La Mesa community, drawing from the surrounding suburban neighborhoods. Its location in San Diego County provides students with access to the educational and cultural resources of one of California's major metropolitan areas.
What Parents Should Know
Grossmont High is a large school with 2,079 students enrolled. Larger schools typically offer a wider range of academic programs, electives, and extracurricular activities. Parents may want to ask about how the school maintains a sense of community and ensures students don't get lost in the crowd.
The student-teacher ratio at Grossmont High is 346.5:1, which is higher than the national average. This may mean larger class sizes, so parents should ask about classroom support, teaching assistants, and how the school differentiates instruction for students who need extra help.
Score Breakdown
Full Profile · 4/4 metricsView breakdown
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Grossmont High — Students at Grossmont High score 42% proficient, which is above what's typical for similar communities (expected: 39%).
Equity & Diversity
Shown separately, not included in overall scoreFree/Reduced Lunch
63.5%
Students qualifying for federal meal assistance
Test Scores CA CAASPP (2023-24)
Based on 8 test records from CA state assessments. About our data
Proficiency Trend
↓ DecliningAverage proficiency (% at or above grade level) across Math & ELA over time.
* COVID-affected year — test participation was uneven nationwide. This data is weighted at 50% in the Growth score calculation.
Source: EdFacts (NCES) and state assessment data. Growth score: 4.4/10.
How Grossmont High Compares
See how Grossmont High performs across key quality dimensions compared to state benchmarks.
Funding & Resources
Performance Trends
Math proficiency has declined from 32% (2019) to 23.73% (2024). Reading/ELA proficiency has declined from 71% (2019) to 61.23% (2024).
Location
PO Box 1043, La Mesa, CA 91944
Nearby Alternatives
Families considering Grossmont High may also want to explore other high schools in the area. JCS - Manzanita (rated 7.8/10, 1.6 miles away), which scores notably higher. Another option is MT HELIX ACADEMY - TIEE (rated 7.7/10, 0.8 miles away), which scores notably higher. Additionally, Spring Valley Academy (rated 7.6/10, 2.2 miles away, in nearby Spring Valley), which scores notably higher. For more schools in La Mesa, see our La Mesa schools guide .
Nearby Schools
20 within 2.2 mi| School | Distance | Rating |
|---|---|---|
| Northmont Elementary La Mesa | 0.7 mi | 3.5 |
| MT HELIX ACADEMY - TIEE La Mesa | 0.8 mi | 7.7 |
| MT. HELIX ACADEMY La Mesa | 0.8 mi | 7.4 |
| Mt. Helix Academy La Mesa | 0.8 mi | — |
| EJE Elementary Academy Charter El Cajon | 1.0 mi | 2.6 |
| EJE Middle Academy El Cajon | 1.0 mi | 4.1 |
| Parkway Sports and Health Science Academy La Mesa | 1.2 mi | 5.8 |
| FOOTHILLS CHRISTIAN HIGH SCHOOL El Cajon | 1.3 mi | 6.7 |
| Shepherd of the Hills Lutheran La Mesa | 1.2 mi | — |
| SHEPHERD OF THE HILLS LUTHERAN SCHOOL La Mesa | 1.2 mi | 4.7 |
| Fletcher Hills Elementary La Mesa | 1.4 mi | 4.8 |
| WARREN-WALKER SCHOOL-LA MESA La Mesa | 1.3 mi | 5.5 |
| Murdock Elementary La Mesa | 1.5 mi | 4.6 |
| Lemon Avenue Elementary La Mesa | 1.6 mi | 6.5 |
| Chase Avenue Elementary El Cajon | 1.5 mi | 3.8 |
| Johnson Elementary El Cajon | 1.7 mi | 6.5 |
| JCS - Manzanita La Mesa | 1.6 mi | 7.8 |
| OUR LADY OF GRACE ELEMENTARY SCHOOL El Cajon | 1.8 mi | 5.8 |
| Flying Hills School of Arts El Cajon | 2.2 mi | 3.3 |
| Spring Valley Academy Spring Valley | 2.2 mi | 7.6 |
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| Central Valley High Ceres, CA | 5.8 |
| Channel Islands High Oxnard, CA | 5.8 |
| Desert Mirage High Thermal, CA | 5.8 |
| Dinuba High Dinuba, CA | 5.8 |
| Gardena Senior High Gardena, CA | 5.8 |
| Gilroy High Gilroy, CA | 5.8 |
Frequently Asked Questions
Common questions about Grossmont High
What grades does Grossmont High serve?
Grossmont High serves students in grades 9th through 12th.
How many students attend Grossmont High?
Grossmont High has an enrollment of approximately 2,079 students.
What is the student-teacher ratio at Grossmont High?
The student-teacher ratio at Grossmont High is 346.5:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Grossmont High rank in CA?
Grossmont High is ranked #6004 out of 9,533 schools in CA.
What is Grossmont High's MySchoolScout rating?
Grossmont High has a composite rating of 5.8 out of 10 on MySchoolScout. This score combines academic performance, student growth, and school environment into a single score. Equity data is shown separately for context.
What are the test scores at Grossmont High?
Based on the most recent state assessment data, Grossmont High has 28.9% math proficiency and 63.1% reading/ELA proficiency.
Is Grossmont High a charter school?
No, Grossmont High is not a charter school. It is a traditional public school operated by the local school district.
Is Grossmont High a Title I school?
No, Grossmont High is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Grossmont High?
63.5% of students at Grossmont High qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
Explore More Schools
Neighborhood Context
Quick Facts NCES CCD (SY 2022-23)
- Grades
- 9th – 12th
- Enrollment
- 2,079
- Student-Teacher Ratio
- 346.5:1
- Teachers (FTE)
- 6
- Free/Reduced Lunch
- 63.5%
- Type
- regular
- Setting
- Large Suburb
- County
- San Diego County
- Phone
- (619) 668-6000
- Data Year
- 2023–2024
Resources & Links
District
Grossmont Union High- District Enrollment
- 16,566
- Schools in District
- 15
- Per-Pupil Spending
- $18,399
- District Rank
- #6 of 14
Other Schools in This District
How We Rate Schools
Every school receives a composite score from 1 to 10 based on four pillars: Academic Performance (50%), Student Growth (20%), Equity (15%), and Learning Environment (15%). Scores are built from publicly available data including standardized test results, enrollment figures, and school climate indicators.
Read our full methodologyRelated reading
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- Best Schools in San Diego, CA — 2026 Rankingsbest schools
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