Best Public Charter Schools in Boulder, CO (2025-26)

Best Boulder Public Charter Schools (2025-26)

For the 2025-26 school year, there are 3 public charter schools serving 837 students in Boulder, CO. The top ranked public charter schools in Boulder, CO are Summit Middle Charter School and Horizons K-8 School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Boulder, CO public charter schools have an score of 75% (versus the Colorado public charter school average of 35%), and score of 81% (versus the 48% statewide average). Charter schools in Boulder have an average ranking of 10/10, which is in the top 5% of Colorado public charter schools.

Minority enrollment is 30% of the student body (majority Hispanic), which is less than the Colorado public charter school average of 52% (majority Hispanic).

Best Public Charter Schools in Boulder, CO (2025-26)

School
(Math and Reading Proficiency)

Location

Quick Facts

Rank: #11.

Summit Middle Charter School

Charter School

(Math: 88% | Reading: 91%)
:

10/

Top 1%

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4655 Hanover Avenue
Boulder, CO 80305
(720) 561-3900

Gr: 6-8 | 361 students Student-teacher ratio: 16:1 Minority enrollment: 37%

Rank: #22.

Horizons K-8 School

Alternative School
Charter School

(Math: 53% | Reading: 65%)
:

Top 20%

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4545 Sioux Drive
Boulder, CO 80303
(720) 561-5580

Gr: K-8 | 361 students Student-teacher ratio: 14:1 Minority enrollment: 18%

Rank: n/an/a

Boulder Prep Charter High School

Alternative School
Charter School

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5075 Chaparral Court #1
Boulder, CO 80301
(303) 545-6186

Gr: 9-12 | 115 students Student-teacher ratio: 10:1 Minority enrollment: 44%

[+] Show Closed Public Schools in Boulder, Colorado

Boulder, Colorado Public Schools (Closed)

School

Location

Quick Facts

Base Line Middle School-arts Focus (Closed 2004)

700 20th Street
Boulder, CO 80302
(303) 443-1062

Gr: 6-8 | 416 students Student-teacher ratio: 16:1 Minority enrollment: 31%

Boulder Explore (Closed 2018)

7690 East Baseline Rd
Boulder, CO 80303
(720) 561-5500

Gr: K-12 | 11 students Student-teacher ratio: 11:1 Minority enrollment: 27%

Halcyon School (Special Education) (Closed 2023)

Special Education School

3100 Bucknell Court
Boulder, CO 80303
(720) 561-4700

Gr: 6-12 | 13 students Student-teacher ratio: 3:1 Minority enrollment: 23%

Mapleton Elementary School (Closed 2004)

840 Mapleton Avenue
Boulder, CO 80304
(303) 442-6962

Gr: K-5 | 128 students Minority enrollment: 9%

Sojourner Charter School (Closed 2004)

Charter School

3050 34th Street
Boulder, CO 80301
(303) 494-9210

Gr: 6-8 | 34 students Minority enrollment: 59%

Washington Bilingual Elementary School (Closed 2004)

1215 Cedar Avenue
Boulder, CO 80304
(303) 449-6618

Gr: K-5 | 285 students Student-teacher ratio: 18:1 Minority enrollment: 68%

Frequently Asked Questions

What are the top ranked public charter schools in Boulder, CO?

The top ranked public charter schools in Boulder, CO include Summit Middle Charter School and Horizons K-8 School. Boulder has one of the highest concentrations of top ranked public schools in Colorado.

How many public charter schools are located in Boulder?

3 public charter schools are located in Boulder.

What is the racial composition of students in Boulder?

Boulder public charter schools minority enrollment is 30% of the student body (majority Hispanic), which is less than the Colorado public charter schools average of 52% (majority Hispanic).