For the 2026 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 53% (majority Hispanic).
Best Public Charter Schools in Boulder County (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 | 366 students Student-teacher ratio: 17:1 Minority enrollment: 36%
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 | 1,447 students Student-teacher ratio: 18:1 Minority enrollment: 44%
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 | 358 students Student-teacher ratio: 14:1 Minority enrollment: 17%
Rank: #44.
Twin Peaks Classical 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 | 879 students Student-teacher ratio: 15:1 Minority enrollment: 39%
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 | 725 students Student-teacher ratio: 13:1 Minority enrollment: 35%
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 | 581 students Student-teacher ratio: 15:1 Minority enrollment: 19%
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 | 108 students Student-teacher ratio: 22:1 Minority enrollment: 71%
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 | 260 students Student-teacher ratio: 12:1 Minority enrollment: 20%
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 | 114 students Student-teacher ratio: 10:1 Minority enrollment: 43%
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 53% (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 Classical Academy vs. Flagstaff Charter Academy, Flagstaff Charter Academy vs. St. Vrain Community Montessori School
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