Very Good
#31 of 188 private schools in CO
Top 16% of private schools
September School
High School
96 ARAPAHOE AVE, Boulder, CO 80302
Estimated academic score. This school does not have standardized test data. Based on CO statewide data. Learn more
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
Updated
2021-22
Updated 2021-22
How this school compares
In Boulder
#1 of 9
public schools
Colorado high schools
#2 of 24
About September School
September School serves 74 students in grades 6-12 as a regular public high school in Boulder, Colorado. With 22 full-time equivalent teachers, the school maintains an exceptionally low student-teacher ratio of 3.4:1, allowing for highly individualized attention and personalized learning experiences. The school has earned strong recognition, receiving an 8.1 out of 10 rating from MySchoolScout and ranking #27 out of 188 schools statewide, placing it in the 86th percentile among Colorado schools.
This impressive performance reflects the school's commitment to student success in its intimate academic environment. Located at 96 Arapahoe Avenue, September School sits in Boulder's 80302 neighborhood, an area characterized by high educational attainment where 76% of residents hold bachelor's degrees or higher. The neighborhood presents interesting contrasts, with median home values reaching $1,065,500 while the median household income is $56,093, and a poverty rate of 35.6% among the ZIP code's 30,569 residents.
September School's small size and exceptional student-teacher ratio create an environment where each student can receive focused academic support and mentoring. The school operates within Boulder's vibrant mid-size city setting, offering students access to the cultural and educational opportunities that this university community provides.
What Parents Should Know
With an enrollment of 74 students, September School is a smaller school where families often find a close-knit community atmosphere. Smaller settings can mean more individual attention from teachers and staff, though they may offer fewer extracurricular options than larger schools.
With a student-teacher ratio of 3.4:1, September School offers a notably low ratio compared to the national average. This typically means smaller class sizes and more opportunities for one-on-one interaction between students and teachers.
As a private school, September School operates independently from the local public school district. Families considering this school should inquire about tuition costs, financial aid availability, and the admissions process. Private schools are not required to follow the same curriculum standards as public schools, which can be either an advantage or a consideration depending on your priorities.
Financial Overview
Source: IRS Form 990 (2023 filing)
- Per-Pupil Spending
- Total expenses ÷ enrollment
- $21,234
- Per-Pupil Revenue
- Total revenue ÷ enrollment
- $15,361
- Financial Health
- Revenue-to-expense ratio (>1.0 = surplus)
- 0.72x — At Risk
- Tuition Dependency
- Share of revenue from program services (tuition, fees)
- 88%
- Total Assets
- End-of-year total assets from IRS filing
- $3.1M
Financial data from IRS Form 990 filings via ProPublica Nonprofit Explorer. Per-pupil figures based on current enrollment of 74 students. Not all private schools file Form 990.
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 | 5.8 |
| Boulder High School | 7.1 |
| New Vista High School | 5.5 |
| Centennial Middle School | 7.5 |
| Community Montessori School | 7.9 |
| Horizons K-8 School | 7.1 |
| Summit Middle Charter School | 8.3 |
| Southern Hills Middle School | 7.6 |
| Manhattan Middle School of the Arts and Academics | 8.5 |
| Fairview High School | 7.4 |
| Nevin Platt Middle School | 8.0 |
| Arapahoe Ridge High School | 6.3 |
| Boulder Universal | 5.5 |
| Boulder Prep Charter High School | 8.0 |
Demographics sourced from NCES Private School Survey (PSS) and Common Core of Data (CCD). Comparisons are based on enrollment-weighted averages.
Score Breakdown
What 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. TARA PERFORMING ARTS HIGH SCHOOL (rated 7.3/10, 3.0 miles away), with a very similar rating. Another option is Boulder High School (rated 7.1/10, 1.3 miles away), with a very similar rating. Additionally, WATERSHED SCHOOL (rated 5.9/10, 1.6 miles away), a more accessible option. 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 | 8.6 |
| Mapleton Early Childhood Center Boulder | 0.9 mi | 7.5 |
| 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 | 5.8 |
| Boulder High School Boulder | 1.3 mi | 7.1 |
| WATERSHED SCHOOL Boulder | 1.6 mi | 5.9 |
| Foothill Elementary School Boulder | 1.8 mi | 8.2 |
| University Hill Elementary School Boulder | 1.5 mi | 8.6 |
| Whittier Elementary School Boulder | 1.7 mi | 5.2 |
| New Vista High School Boulder | 1.8 mi | 5.5 |
| Columbine Elementary School Boulder | 2.1 mi | 7.8 |
| JARROW MONTESSORI SCHOOL Boulder | 2.4 mi | 6.1 |
| Centennial Middle School Boulder | 2.8 mi | 7.5 |
| 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 | 7.9 |
| Bear Creek Elementary School Boulder | 2.9 mi | 6.8 |
| Creekside Elementary School at Martin Park Boulder | 3.0 mi | 9.3 |
| Mesa Elementary School Boulder | 3.4 mi | 7.8 |
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
Community Profile
The community surrounding September School has a median household income of $60,649. It is a well-educated community where 75% of adults hold a bachelor's degree or higher. The median home value in the area is $1,123,800, with a median rent of $1,850/month. The area has a poverty rate of 35.3%, indicating some economic challenges in the community. The average commute for residents is 20 minutes. Source: U.S. Census ACS 2022 5-Year Estimates.
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| 5280 High School Denver, CO | 7.3 |
| Aspen Valley Campus Colorado Springs, CO | 7.3 |
| Nucla High School Nucla, CO | 7.3 |
| TARA PERFORMING ARTS HIGH SCHOOL Boulder, CO | 7.3 |
| Welte Education Center Fountain, CO | 7.3 |
| Fowler High School Fowler, 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 is ranked #31 out of 188 private schools in CO.
What is September School's MySchoolScout rating?
September School has a composite rating of 7.3 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.
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.
Explore More Schools
Neighborhood Context
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
- Phone
- (303) 443-9933
- Data Year
- 2022–2023
Resources & Links
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
Get school insights in your inbox
New rankings, best-schools lists, and parent guides — delivered free. No spam, unsubscribe anytime.
We respect your privacy. Unsubscribe at any time.