For the 2026 school year, there are 2 public high schools serving 251 students in Custer County, ID.
The top-ranked public high schools in Custer County, ID are Mackay Jr/sr High School and Challis Jr/sr High School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.
Custer County, ID public high schools have an average math proficiency score of 26% (versus the Idaho public high school average of 37%), and reading proficiency score of 43% (versus the 58% statewide average). High schools in Custer County have an average ranking of 2/10, which is in the bottom 50% of Idaho public high schools.
Custer County, ID public high school have a Graduation Rate of 70%, which is less than the Idaho average of 80%.
The school with highest graduation rate is Challis Jr/sr High School, with 60-79% graduation rate. Read more about public school graduation rate statistics in Idaho or national school graduation rate statistics.
Minority enrollment is 13% of the student body (majority Hispanic), which is less than the Idaho public high school average of 26% (majority Hispanic).
Best Public High Schools in Custer County (2026)
School
(Math and Reading Proficiency)
(Math and Reading Proficiency)
Location
Quick Facts
Rank: #11.
Mackay Jr/sr High School
(Math: 20-29% | Reading: 50-59%)
Rank:
Rank:
4/
Bottom 50%10
390 East Spruce Street
Mackay, ID 83251
(208) 588-2262
Mackay, ID 83251
(208) 588-2262
Gr: 7-12 | 102 students Student-teacher ratio: 13:1 Minority enrollment: 15%
Rank: #22.
Challis Jr/sr High School
(Math: 25-29% | Reading: 35-39%)
Rank:
Rank:
2/
Bottom 50%10
1110 Bluff Avenue
Challis, ID 83226
(208) 879-2255
Challis, ID 83226
(208) 879-2255
Gr: 7-12 | 149 students Student-teacher ratio: 11:1 Minority enrollment: 11%
Custer County Public Schools (Closed)
School
Location
Quick Facts
Po Box 304
Challis, ID 83226
(208) 879-5063
Challis, ID 83226
(208) 879-5063
Gr: 6-8 | 129 students Student-teacher ratio: 16:1 Minority enrollment: 9%
Hc 67 - Box 586
Clayton, ID 83227
(208) 838-2244
Clayton, ID 83227
(208) 838-2244
Gr: K-5 | 7 students Student-teacher ratio: 7:1
Frequently Asked Questions
What are the top-ranked public high schools in Custer County, ID?
The top-ranked public high schools in Custer County, ID include Mackay Jr/sr High School and Challis Jr/sr High School.
How many public high schools are located in Custer County?
2 public high schools are located in Custer County.
What is the racial composition of students in Custer County?
Custer County public high schools minority enrollment is 13% of the student body (majority Hispanic), which is less than the Idaho public high schools average of 26% (majority Hispanic).
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