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For the 2025-26 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).