Temple Grandin School Photo - TGS Trades Classroom

Best Boulder Private High Schools (2026)

For the 2026 school year, there are 6 private high schools serving 416 students in Boulder, CO.
The top-ranked private high schools in Boulder, CO include September School, Tara Performing Arts High School, and Shining Mountain Waldorf School.
The average acceptance rate is 62%, which is lower than the Colorado private high school average acceptance rate of 82%.
17% of private high schools in Boulder, CO are religiously affiliated (most commonly Other).

Top-Ranked Boulder Private High Schools (2026)

School
Location
Quick Facts
September School
September School Photo - Winter Trip in Estes Park
(1)
96 Arapahoe Ave.
Boulder, CO 80302
(303) 443-9933
Gr: 9-12 | 24 students Avg. class size: 8 students Sports: 1 | Extracurrculars: 8 Tuition listed
Shining Mountain Waldorf School
Shining Mountain Waldorf School Photo - Movement
Special Program Emphasis
(17)
999 Violet Avenue
Boulder, CO 80304
(303) 444-7697
Gr: PK-12 | 200 students Avg. class size: 20 students Sports: 4 | Extracurrculars: 6 Tuition & acceptance rate listed
Tara Performing Arts High School
Tara Performing Arts High School Photo - Ninth grade: History through Art in New York
Special Program Emphasis
4180 19th St
Boulder, CO 80304
(303) 410-4510
Gr: 9-12 | 55 students Tuition & acceptance rate listed
Joshua School-boulder
Special Education School
7077 Harvest Rd
Boulder, CO 80301
(303) 974-7732
Gr: 4-12 | 18 students
Temple Grandin School
Temple Grandin School Photo - TGS Trades Classroom
Special Education School
(2)
3131 Indian Road
Boulder, CO 80301
(303) 554-7363
Gr: 6-12 | 17 students Avg. class size: 6 students Extracurrculars: 4 Tuition & acceptance rate listed
Watershed School
Watershed School Photo
Alternative School
(8)
5405 Spine Rd
Boulder, CO 80301
(303) 440-7520
Gr: 6-12 | 102 students Sports: 4 | Extracurrculars: 6 Tuition listed
[+] Show Closed Private Schools in Boulder, Colorado

Boulder, Colorado Private Schools (Closed)

School
Location
Quick Facts
3046 11th St
Boulder, CO 80304
(303) 443-4965
Gr: PK-K | 34 students
5524 Baseline Rd
Boulder, CO 80303
(303) 494-3100
Gr: PK-K | 33 students Acceptance rate listed

Overview

This Town (Boulder)
This State (CO)
# Schools
6 Schools

Student Body:

# Students
416 Students
29,103 Students
% Average Students of Color
9%
25%

Academics and Faculty:

# Teachers
91 Teachers
3,052 Teachers
Average Student-Teacher Ratio
5:1
10:1
% Average Faculty w/Advanced Degree
64%
55%
Average Class Size
11 students
13 students

Tuition and Acceptance Rate:

Average Yearly Tuition Cost
$29,739
$16,723
Average Summer Program Cost
$1,500
$2,471
Average % on Financial Aid
30%
33%
Average Financial Aid Grant
$10,633
$8,504
Average Acceptance Rate
62%
82%

Students by Ethnicity:

0.20
0.58
# American Indian Students
3 Students
269 Students
% American Indian Students
1%
1%
# Asian Students
19 Students
914 Students
% Asian Students
4%
3%
# Hispanic Students
17 Students
2,811 Students
% Hispanic Students
3%
9%
# Black Students
7 Students
1,099 Students
% Black Students
1%
4%
# White Students
462 Students
17,970 Students
% White Students
89%
61%
# Hawaiian Students
n/a
37 Students
% Hawaiian Students
n/a
n/a
# Two or more races Students
n/a
n/a
% of Two or more races Students
n/a
n/a
# Others Students
8 Students
6,384 Students
% of Others Students
2%
22%
All Ethnic Groups

Extracurriculars and Sports:

Average Number of Extracurriculars
6 extracurriculars
9 extracurriculars
Average Number of Sports
3 sports
8 sports

Frequently Asked Questions

What are the top-ranked private high schools in Boulder, CO?
The top-ranked private high schools in Boulder, CO include September School, Tara Performing Arts High School, and Shining Mountain Waldorf School.
How many private high schools are located in Boulder?
6 private high schools are located in Boulder.
How diverse are private high schools in Boulder?
Boulder private high schools are approximately 9% minority students, which is lower than the Colorado private school average of 25%.
What percentage of private high schools are religiously affiliated in Boulder?
17% of private high schools in Boulder are religiously affiliated (most commonly Other).

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