For the 2026 school year, there are 2 public high schools serving 488 students in Costilla County, CO.
The top-ranked public high schools in Costilla County, CO are Sierra Grande K-12 School and Centennial School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.
Costilla County, CO public high schools have an average math proficiency score of 7% (versus the Colorado public high school average of 34%), and reading proficiency score of 22% (versus the 53% statewide average). High schools in Costilla County have an average ranking of 1/10, which is in the bottom 50% of Colorado public high schools.
Costilla County, CO public high school have a Graduation Rate of 62%, which is less than the Colorado average of 82%.
The school with highest graduation rate is Sierra Grande K-12 School, with 60-79% graduation rate. Read more about public school graduation rate statistics in Colorado or national school graduation rate statistics.
Minority enrollment is 84% of the student body (majority Hispanic), which is more than the Colorado public high school average of 49% (majority Hispanic).
Best Public High Schools in Costilla County (2026)
School
(Math and Reading Proficiency)
(Math and Reading Proficiency)
Location
Quick Facts
Rank: #11.
Sierra Grande K-12 School
(Math: 6-9% | Reading: 20-24%)
Rank:
Rank:
1/
Bottom 50%10
17523 East Highway 160
Blanca, CO 81123
(719) 379-3257
Blanca, CO 81123
(719) 379-3257
Gr: PK-12 | 302 students Student-teacher ratio: 16:1 Minority enrollment: 84%
Rank: #22.
Centennial School
(Math: ≤5% | Reading: 20-24%)
Rank:
Rank:
1/
Bottom 50%10
909 North Main Street
San Luis, CO 81152
(719) 672-3322
San Luis, CO 81152
(719) 672-3322
Gr: PK-12 | 186 students Student-teacher ratio: 17:1 Minority enrollment: 85%
Costilla County Public Schools (Closed)
School
Location
Quick Facts
909 North Main Street
San Luis, CO 81152
(719) 672-3322
San Luis, CO 81152
(719) 672-3322
Gr: PK-5 | 107 students Student-teacher ratio: 12:1 Minority enrollment: 88%
909 North Main Street
San Luis, CO 81152
(719) 672-3322
San Luis, CO 81152
(719) 672-3322
Gr: 6-8 | 54 students Student-teacher ratio: 9:1 Minority enrollment: 91%
17523 East Hwy 160
Blanca, CO 81123
(719) 379-3257
Blanca, CO 81123
(719) 379-3257
Gr: K-5 | 114 students Student-teacher ratio: 13:1 Minority enrollment: 83%
17523 East Hwy 160
Blanca, CO 81123
(719) 379-3257
Blanca, CO 81123
(719) 379-3257
Gr: 6-8 | 65 students Student-teacher ratio: 13:1 Minority enrollment: 85%
Frequently Asked Questions
What are the top-ranked public high schools in Costilla County, CO?
The top-ranked public high schools in Costilla County, CO include Sierra Grande K-12 School and Centennial School.
How many public high schools are located in Costillaunty?
2 public high schools are located in Costillaunty.
What is the racial composition of students in Costillaunty?
Costillaunty public high schools minority enrollment is 84% of the student body (majority Hispanic), which is more than the Colorado public high schools average of 49% (majority Hispanic).
Which public high schools in Costillaunty are often viewed compared to one another?
Popular comparisons of public high schools in Costillaunty include: Sierra Grande K-12 School vs. Centennial School, Centennial School vs. Sierra Grande K-12 School
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