September High School is an intimate and supportive learning community that fosters individual development and reawakens the love of learning.
We empower ourselves to be critical thinkers, lifelong learners, and responsible citizens.
Quick Stats (2025)
- Top Ranked CO School
- Grades: 9-12
- Enrollment: 24 students
- Yearly Tuition: $23,575
- Average class size: 8 students
- Application Deadline: None / Rolling
- Source: Verified school update
Top Rankings
September School ranks among the top 20% of private schools in Colorado for:
Category
Attribute
Advanced Degrees
School Overview
School Membership(s)School Assoc.
Religious Affiliation
Grades Offered
Grades 9-12
ADD/ADHD Support
Yes
Learning Difference Programs
Yes
Learning Programs Supported
All
Year Founded
1973
Summer School Offered
Yes
School Calendar
Student Body
Total Students
24 students
Student Body Type
Co-ed
% Students of Color
7%
State avg.: 25%
Students by Grade

Academics and Faculty
Total Classroom Teachers
8 teachers
Student : Teacher Ratio
3:1
National avg.: 13:1
% Faculty w/Advanced Degree
99%
Average Class Size
8 students
Advanced Courses
Honors available in all courses
Classroom Dress Code
Casual
We have no dress code.
Tuition and Acceptance Rate
Admission Deadline
None / Rolling
Yearly Tuition Cost
$23,575
Tuition Notes
Financial aid available.
Summer Program Cost
$1,500
Summer Program Cost Notes
$1500 per course
% on Financial Aid
40%
Average Financial Aid Grant
$8,500
Admissions Director
Sarah Desouza
Admissions Associate
Kelly Molinet
Application URL
Sports
Total Sports Offered
1 sport
Sports
Extracurriculars
Total ExtracurricularsTotal Extra-curric.
8 extracurriculars
ExtracurricularsExtra-curric.
Club or Organization:
Arts and Music Programs:
Recreational Athletic Programs:
Chess Club, Jewish Culture Club, Natural Highs, Queer Focus, Student Leadership Council
Arts and Music Programs:
Animation Club, Open Art Studio
Recreational Athletic Programs:
Skateboarding Club
School Notes
- Boulder's longest running independent school
- Dedicated to maintaining 8:1 student teacher ratio
- Individualized education and support
- Social emotional support and strong community
Source: Verified school update
Frequently Asked Questions
How much does September School cost?
September School's tuition is approximately $23,575 for private students and $1,500 for summer students.
What sports does September School offer?
September School offers 1 interscholastic sports: Martial Arts.
What is September School's ranking?
September School ranks among the top 20% of private schools in Colorado for: Highest percentage of faculty with advanced degrees.
When is the application deadline for September School?
The application deadline for September School is rolling (applications are reviewed as they are received year-round).
In what neighborhood is September School located?
September School is located in the Downtown neighborhood of Boulder, CO.
School Reviews
5 4/12/2024
It's hard to describe the difference in our son's attitude to school, to learning, and just about everything else since starting at September School. He's now learning Spanish at an AP level where he once floundered in incomplete assignments. He's interested in and informed about world events; social studies hadn't even sparked an interest in the past. In areas where he still struggles, he has teachers who understand how he learns and help him along while still holding him to him to high standards. He's actually learning, not just showing up and turning in busywork.Earlier struggles at school extended to his social and emotional life. It was hard to see him struggle when I knew him to be bright, funny, insightful, and kind. September school has drawn that out. He's part of a supportive community, has good friends, and is valued for being himself.
Endorse September School. Endorsements should be a few sentences in length. Please include any comments on:
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