Very Good
#31 of 188 private schools in CO
Top 16% of private schools
September School
High School
96 ARAPAHOE AVE, Boulder, CO 80302
Enrollment
74
Student-Teacher
3.4:1
Score
7.3
Grades
6th – 12th
Enrollment
74
Student-Teacher
3.4:1
Score
7.3
Grades
6th – 12th
Data vintage
2021-22
Data vintage2021-22
How this school compares
Colorado private schools
#31 of 188
In Boulder
#1 of 9
public schools
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September School
High School in Boulder · grades 6th – 12th. Start here, then compare fit against nearby and district options.
Flatirons Elementary School
0.8 mi away. Use as a geographic alternative in the same move search.
Mapleton Early Childhood Center
0.9 mi away. Use as a geographic alternative in the same move search.
About September School
September School is a private high school in Boulder, CO. September School serves approximately 74 students, and covers grades 6th-12th, and has a 3.4:1 student-teacher ratio. September School has a current MySchoolScout rating of 7.3 out of 10 and ranks #31 of 188 private schools in CO.
- This school 7.3 · Very Good
- CO avg 6.5
What Parents Should Know
At 74 students, September School is on the smaller side. That usually buys more individual attention and teachers who know every kid by name, with the trade-off of fewer electives and extracurriculars than a larger school can staff. Ask what activities it actually offers.
At 3.4:1 students to teachers, September School sits well below the national average. Smaller classes like that usually mean more one-on-one time between students and teachers.
September School is private, so it runs independently of the local district and sets its own curriculum. That freedom cuts both ways depending on what you want for your child. If you're considering it, start with the practical questions: tuition, financial aid, and how admissions work.
Compare to Public Schools
BetaHow September School compares to 15 public schools serving similar grades in Boulder, CO
Student Demographics
Nearby High Schools
| School | Rating |
|---|---|
| September School (this school) | 7.3 |
| Williamsburg Academy of Colorado | — |
| Casey Middle School | 6.7 |
| Boulder High School | 8.3 |
| New Vista High School | 7.9 |
| Centennial Middle School | 7.7 |
| Community Montessori School | 7.2 |
| Horizons K-8 School | 8.5 |
| Summit Middle Charter School | 9.5 |
| Southern Hills Middle School | 8.8 |
| Manhattan Middle School of the Arts and Academics | 8.3 |
| Fairview High School | 8.6 |
| Nevin Platt Middle School | 7.6 |
| Boulder Universal | 8.0 |
| Arapahoe Ridge High School | 6.4 |
| Boulder Prep Charter High School | 5.9 |
Demographics sourced from NCES Private School Survey (PSS) and Common Core of Data (CCD). Comparisons are based on enrollment-weighted averages.
Score Breakdown
PreliminaryWhat This Rating Measures
This rating reflects classroom size, instructional time, student diversity, community resources, and school characteristics. Private schools are ranked against other private schools in CO.
Data Unavailable
View data sources
Score basis: Private school model
Data coverage: 80% of scoring components had data
Components scored: 4 of 5
Ranking pool: Private schools in CO
Test Scores
Test score data not yet available for this school.
Student Demographics NCES PSS (SY 2021-22)
Source: NCES Private School Survey (PSS)
Location
96 ARAPAHOE AVE, Boulder, CO 80302
Nearby Alternatives
Families considering September School may also want to explore other high schools in the area. Boulder High School (rated 8.3/10, 1.3 miles away), which scores notably higher. Another option is New Vista High School (rated 7.9/10, 1.8 miles away), which scores slightly higher. Additionally, TARA PERFORMING ARTS HIGH SCHOOL (rated 7.3/10, 3.0 miles away), with a very similar rating. For more schools in Boulder, see our Boulder schools guide .
Nearby Schools
20 within 3.4 mi| School | Distance | Rating |
|---|---|---|
| Flatirons Elementary School Boulder | 0.8 mi | 8.5 |
| Mapleton Early Childhood Center Boulder | 0.9 mi | 6.0 |
| Williamsburg Academy of Colorado Boulder | 1.1 mi | — |
| SACRED HEART OF JESUS SCHOOL Boulder | 1.2 mi | 7.0 |
| Casey Middle School Boulder | 1.2 mi | 6.7 |
| Boulder High School Boulder | 1.3 mi | 8.3 |
| WATERSHED SCHOOL Boulder | 1.6 mi | 5.9 |
| Foothill Elementary School Boulder | 1.8 mi | 8.8 |
| University Hill Elementary School Boulder | 1.5 mi | 7.6 |
| Whittier Elementary School Boulder | 1.7 mi | 7.0 |
| New Vista High School Boulder | 1.8 mi | 7.9 |
| Columbine Elementary School Boulder | 2.1 mi | 6.3 |
| JARROW MONTESSORI SCHOOL Boulder | 2.4 mi | 6.1 |
| Centennial Middle School Boulder | 2.8 mi | 7.7 |
| SHINING MOUNTAIN WALDORF SCHOOL Boulder | 3.0 mi | 6.9 |
| TARA PERFORMING ARTS HIGH SCHOOL Boulder | 3.0 mi | 7.3 |
| Crest View Elementary School Boulder | 3.0 mi | 7.2 |
| Bear Creek Elementary School Boulder | 2.9 mi | 9.1 |
| Creekside Elementary School at Martin Park Boulder | 3.0 mi | 9.3 |
| Mesa Elementary School Boulder | 3.4 mi | 9.1 |
Neighborhood Census ACS (2019-2023)
Census data for ZIP 80302 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$60,649
Median Home Value
$1,123,800
Median Rent
$1,850/mo
Population
29,751
College Educated
75.2%
Homeownership
40.1%
Avg Commute
19.7 min
Poverty Rate
35.3%
Median Age
24.5
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| Bridges Carbondale, CO | 7.3 |
| TARA PERFORMING ARTS HIGH SCHOOL Boulder, CO | 7.3 |
| eDCSD Englewood, CO | 7.3 |
| Compassion Road Academy Denver, CO | 7.2 |
| Durango Big Picture High School Durango, CO | 7.4 |
| Granada Undivided High School Granada, CO | 7.4 |
Frequently Asked Questions
Common questions about September School
What grades does September School serve?
September School serves students in grades 6th through 12th.
How many students attend September School?
September School has an enrollment of approximately 74 students.
What is the student-teacher ratio at September School?
The student-teacher ratio at September School is 3.4:1. A lower ratio generally means more individual attention per student. The national average is approximately 11:1 for private schools.
How does September School rank in CO?
September School ranks #31 of 188 private schools in CO.
What is September School's MySchoolScout rating?
September School has a current MySchoolScout rating of 7.3 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.
Is September School a private school?
Yes, September School is a private coeducational school with a Nonsectarian affiliation. Private schools are not required to participate in state standardized testing, so academic performance data may be limited compared to public schools.
Is September School a religious school?
No, September School is a nonsectarian (non-religious) private school.
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Neighborhood Context
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Quick Facts NCES PSS (SY 2021-22)
- Grades
- 6th – 12th
- Enrollment
- 74
- Gender Split
- 55% M / 45% F
- Student-Teacher Ratio
- 3.4:1
- Teachers (FTE)
- 22
- Type
- private
- Coed Status
- coed
- Affiliation
- Nonsectarian
- School Day
- 6.5 hours
- Days Per Year
- 180 days
- Setting
- Midsize City
- County
- Boulder County
- Phone
- (303) 443-9933
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