For the 2025 school year, there are 9 public charter schools serving 4,834 students in Boulder County, CO. The top ranked public charter schools in Boulder County, CO are Summit Middle Charter School, Peak To Peak 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 County, CO public charter schools have an average math proficiency score of 56% (versus the Colorado public charter school average of 35%), and reading proficiency score of 64% (versus the 48% statewide average). Charter schools in Boulder County have an average ranking of 9/10, which is in the top 20% of Colorado public charter schools.
Minority enrollment is 35% 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 County (2025)
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.
Peak To Peak Charter School
Charter School
(Math: 61% | Reading: 67%)
Rank:
Rank:
10/
Top 10%10
800 Merlin Drive
Lafayette, CO 80026
(303) 453-4600
Lafayette, CO 80026
(303) 453-4600
Gr: K-12 | 1,452 student Student-teacher ratio: 19:1 Minority enrollment: 43%
Rank: #33.
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: #44.
Twin Peaks Charter Academy
Charter School
(Math: 48% | Reading: 56%)
Rank:
Rank:
8/
Top 30%10
340 South Sunset Street
Longmont, CO 80501
(303) 772-7286
Longmont, CO 80501
(303) 772-7286
Gr: K-12 | 852 students Student-teacher ratio: 17:1 Minority enrollment: 41%
Rank: #55.
Flagstaff Charter Academy
Charter School
(Math: 42% | Reading: 57%)
Rank:
Rank:
8/
Top 30%10
2040 Miller Drive
Longmont, CO 80501
(303) 651-7900
Longmont, CO 80501
(303) 651-7900
Gr: PK-8 | 775 students Student-teacher ratio: 13:1 Minority enrollment: 33%
Rank: #66.
Aspen Ridge Preparatory School
Charter School
(Math: 48% | Reading: 52%)
Rank:
Rank:
8/
Top 30%10
705 Austin Avenue
Erie, CO 80516
(720) 242-6225
Erie, CO 80516
(720) 242-6225
Gr: K-8 | 548 students Student-teacher ratio: 14:1 Minority enrollment: 18%
Rank: #77.
Justice High Charter School
Alternative School
Charter School
Charter School
(Math: <50% | Reading: <50%)
Rank:
Rank:
8/
Top 30%10
805 Excalibur
Lafayette, CO 80026
(720) 935-1337
Lafayette, CO 80026
(720) 935-1337
Gr: 6-12 | 103 students Student-teacher ratio: 21:1 Minority enrollment: 69%
Rank: #88.
St. Vrain Community Montessori School
Charter School
(Math: ≥50% | Reading: 40-59%)
Rank:
Rank:
8/
Top 30%10
1055 Delaware Ave.
Longmont, CO 80501
(303) 682-4339
Longmont, CO 80501
(303) 682-4339
Gr: PK-8 | 267 students Student-teacher ratio: 12:1 Minority enrollment: 19%
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 County Public Schools (Closed)
School
Location
Quick Facts
Adult Educationlincoln Center (Closed 2014)
Alternative School
820 Main St
Longmont, CO 80501
(303) 678-5662
Longmont, CO 80501
(303) 678-5662
Gr: 6-12 | 122 students Minority enrollment: 57%
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%
233 East Mountain View
Longmont, CO 80501
(303) 772-7900
Longmont, CO 80501
(303) 772-7900
Gr: 6-8 | 414 students Student-teacher ratio: 14:1 Minority enrollment: 87%
333 East Mountain View
Longmont, CO 80501
(303) 772-4280
Longmont, CO 80501
(303) 772-4280
Gr: PK-5 | 380 students Student-teacher ratio: 15:1 Minority enrollment: 81%
840 Mapleton Avenue
Boulder, CO 80304
(303) 442-6962
Boulder, CO 80304
(303) 442-6962
Gr: K-5 | 128 students Minority enrollment: 9%
1200 South Sunset Street
Longmont, CO 80501
(720) 494-3975
Longmont, CO 80501
(720) 494-3975
Gr: 9-12
1200 South Sunset Street
Longmont, CO 80501
(720) 494-3969
Longmont, CO 80501
(720) 494-3969
Gr: 9-12 | 50 students Student-teacher ratio: 13:1 Minority enrollment: 76%
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%
1440 Collyer St
Longmont, CO 80501
(720) 494-3761
Longmont, CO 80501
(720) 494-3761
Gr: PK-5 | 320 students Student-teacher ratio: 12:1 Minority enrollment: 89%
Ute Creek Secondary Charter Academy (Closed 2008)
Charter School
1198 Boston Avenue
Longmont, CO 80501
(303) 774-0066
Longmont, CO 80501
(303) 774-0066
Gr: 9-12 | 169 students Student-teacher ratio: 14:1 Minority enrollment: 33%
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 County, CO?
The top ranked public charter schools in Boulder County, CO include Summit Middle Charter School, Peak To Peak Charter School and Horizons K-8 School. Boulder County has one of the highest concentrations of top ranked public schools in Colorado.
How many public charter schools are located in Boulderunty?
9 public charter schools are located in Boulderunty.
What is the racial composition of students in Boulderunty?
Boulderunty public charter schools minority enrollment is 35% of the student body (majority Hispanic), which is less than the Colorado public charter schools average of 52% (majority Hispanic).
Which public charter schools in Boulderunty are often viewed compared to one another?
Popular comparisons of public charter schools in Boulderunty include: St. Vrain Community Montessori School vs. Flagstaff Charter Academy, Twin Peaks Charter Academy vs. Flagstaff Charter Academy, Flagstaff Charter Academy vs. St. Vrain Community Montessori School
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