For the 2026 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 average math proficiency score of 75% (versus the Colorado public charter school average of 35%), and reading proficiency 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 (2026)
School
(Math and Reading Proficiency)
(Math and Reading Proficiency)
Location
Quick Facts
Rank: #11.
Summit Middle Charter School
Charter School
(Math: 88% | Reading: 91%)
Rank:
Rank:
10/
Top 1%10
4655 Hanover Avenue
Boulder, CO 80305
(720) 561-3900
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
Charter School
(Math: 53% | Reading: 65%)
Rank:
Rank:
9/
Top 20%10
4545 Sioux Drive
Boulder, CO 80303
(720) 561-5580
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
Charter School
5075 Chaparral Court #1
Boulder, CO 80301
(303) 545-6186
Boulder, CO 80301
(303) 545-6186
Gr: 9-12 | 115 students Student-teacher ratio: 10:1 Minority enrollment: 44%
Boulder, Colorado Public Schools (Closed)
School
Location
Quick Facts
700 20th Street
Boulder, CO 80302
(303) 443-1062
Boulder, CO 80302
(303) 443-1062
Gr: 6-8 | 416 students Student-teacher ratio: 16:1 Minority enrollment: 31%
7690 East Baseline Rd
Boulder, CO 80303
(720) 561-5500
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
Boulder, CO 80303
(720) 561-4700
Gr: 6-12 | 13 students Student-teacher ratio: 3:1 Minority enrollment: 23%
840 Mapleton Avenue
Boulder, CO 80304
(303) 442-6962
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
Boulder, CO 80301
(303) 494-9210
Gr: 6-8 | 34 students Minority enrollment: 59%
1215 Cedar Avenue
Boulder, CO 80304
(303) 449-6618
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).
Recent Articles
Year-Round Schooling in 2026: Updated Parent Guide
Explore the latest 2026 data, trends, costs, and parent planning tips in the ongoing debate over year-round schooling vs the traditional calendar.
No Child Left Behind: Past, Present, and Future of U.S. School Policy
Explore how No Child Left Behind evolved into ESSA, what it means for 2025‑26 schooling, and what parents need to know about testing, admissions planning, and funding.
Understanding Public School Fees & Optional Costs Guide
Discover what public school fees are required versus optional, with 2026 updates for parents, students, and educators on budgeting and planning.