For the 2025-26 school year, there are 11 private high schools serving 1,216 students in Boulder County, CO.
The top ranked private high schools in Boulder County, CO include Dawson School, September School, and Shining Mountain Waldorf School.
The average tuition cost is $22,049, which is higher than the Colorado private high school average tuition cost of $16,544.
Top Ranked Boulder County Private High Schools (2025-26)
School
Location
Quick Facts
10455 Dawson Drive
Lafayette, CO 80026
(303) 665-6679
Lafayette, CO 80026
(303) 665-6679
Gr: K-12 | 515 students Avg. class size: 15 students Sports: 11 | Extracurrculars: 7 Tuition listed
Fusion Academy Boulder County
Alternative School
168 Centennial Parkway, Suite 100
Louisville, CO 80027
(877) 673-8893
Louisville, CO 80027
(877) 673-8893
Gr: 6-12 Avg. class size: 1 student Tuition listed
96 Arapahoe Ave.
Boulder, CO 80302
(303) 443-9933
Boulder, CO 80302
(303) 443-9933
Gr: 9-12 | 24 students Avg. class size: 8 students Sports: 1 | Extracurrculars: 8 Tuition listed
999 Violet Avenue
Boulder, CO 80304
(303) 444-7697
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]( "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
Boulder, CO 80304
(303) 410-4510
Gr: 9-12 | 55 students Tuition & acceptance rate listed
Transitional School
Alternative School (Church of Christ)
14780 N 107th St
Longmont, CO 80504
(303) 776-6841
Longmont, CO 80504
(303) 776-6841
Gr: 6-11 | 9 students
Crossroads School![Crossroads School Photo - Crossroads 2022-2023 Graduates]( "Crossroads School Photo - Crossroads 2022-2023 Graduates")
Alternative School (Christian)
833 15th Ave.
Longmont, CO 80501
(303) 709-9881
Longmont, CO 80501
(303) 709-9881
Gr: 6-12 | 50 students Extracurrculars: 1 Tuition listed
Hillside School
Special Education School
6620 Gunpark Rd
Longmont, CO 80301
(303) 494-1468
Longmont, CO 80301
(303) 494-1468
Gr: 2-12 | 57 students Avg. class size: 4 students Tuition listed
1440 Collyer St
Longmont, CO 80501
(303) 776-3254
Longmont, CO 80501
(303) 776-3254
Gr: PK-12 | 129 students Extracurrculars: 3 Tuition listed
3131 Indian Road
Boulder, CO 80301
(303) 554-7363
Boulder, CO 80301
(303) 554-7363
Gr: 6-12 | 17 students Avg. class size: 6 students Extracurrculars: 4 Tuition & acceptance rate listed
5405 Spine Rd
Boulder, CO 80301
(303) 440-7520
Boulder, CO 80301
(303) 440-7520
Gr: 6-12 | 102 students Sports: 4 | Extracurrculars: 6 Tuition listed
Boulder County Private Schools (Closed)
School
Location
Quick Facts
Blue Sky Kindergarten (Closed 2013)
Daycare / Preschool
3046 11th St
Boulder, CO 80304
(303) 443-4965
Boulder, CO 80304
(303) 443-4965
Gr: PK-K | 34 students
Bright Horizons at Louisville (Closed 2025)
Daycare / Preschool
1818 Centennial Dr
Louisville, CO 80027
(303) 665-5511
Louisville, CO 80027
(303) 665-5511
Gr: NS-K Tuition & acceptance rate listed
Bright Horizons at West Longmont (Closed 2022)
Daycare / Preschool
1011 Dry Creek Dr
Longmont, CO 80503
(303) 682-0102
Longmont, CO 80503
(303) 682-0102
Gr: NS-K
The Cottage School - Terry (Closed 2023)
Montessori School
1941 Terry St
Longmont, CO 80501
(303) 651-3780
Longmont, CO 80501
(303) 651-3780
Gr: K | 3 students
Countryside Montessori School (Closed 2022)
Montessori School
5524 Baseline Rd
Boulder, CO 80303
(303) 494-3100
Boulder, CO 80303
(303) 494-3100
Gr: PK-K | 33 students Acceptance rate listed
Desiderata School (Closed 2025)
Alternative School
8979 Nelson Rd.
Longmont, CO 80503
(303) 678-9335
Longmont, CO 80503
(303) 678-9335
Gr: 6-12 | 18 students Avg. class size: 10 students Tuition & acceptance rate listed
Faith Baptist School (Closed 2022)
(Baptist)
833 15th Ave
Longmont, CO 80501
(303) 776-5677
Longmont, CO 80501
(303) 776-5677
Gr: 1-12 | 129 students
Lyons Community Montessori (Closed 2020)
Montessori School
419 Main St
Lyons, CO 80540
(303) 823-9629
Lyons, CO 80540
(303) 823-9629
Gr: NS | 38 students
Our Saviors Lutheran School (Closed 2012)
(Wisconsin Evangelical Lutheran Synod)
1219 W 17th Avenue
Longmont, CO 80501
(303) 776-1688
Longmont, CO 80501
(303) 776-1688
Gr: NS-1 | 11 students Avg. class size: 3 students Tuition listed
Frequently Asked Questions
What are the top ranked private high schools in Boulder County, CO?
The top ranked private high schools in Boulder County, CO include Dawson School, September School, and Shining Mountain Waldorf School.
How many private high schools are located in Boulderunty?
11 private high schools are located in Boulderunty.
How much do private high schools cost in Boulderunty?
The average tuition cost is $22,049, which is higher than the Colorado private school average tuition cost of $16,544.
How diverse are private high schools in Boulderunty?
Boulderunty private high schools are approximately 13% minority students, which is lower than the Colorado private school average of 24%.
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