Centennial High School
Boise, ID · High School · Grades 9-12
Centennial High School is a high school in Boise, ID with 1,931 students enrolled and a 55% proficiency rate. Part of Joint School District No. 2. NCES data from the U.S. Department of Education.
Centennial High School is a high school in Boise, ID, enrolling 1,931 students in grades 9-12 within the Joint School District No. 2. That headcount is above the 658-student average for schools in the district.
EDFacts assessment data puts 55% of students at or above grade level in combined math and reading, a little above the national midpoint where roughly half of tested students clear the bar. That is 5 points below the 60% average for the Joint School District No. 2. That is in line with the 54% Idaho statewide average.
Over the last three reported years the district proficiency rate this school inherits has fallen by about 13 points. As a high school, it reports a 84% adjusted-cohort graduation rate, the share of first-time ninth-graders who earn a regular diploma within four years.
The student-teacher ratio is 21.2 to 1, above the U.S. average of roughly 16 to 1. A relatively low 22% of students qualify for free or reduced-price lunch.
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About This School
Centennial High School is a high school located in Boise, Idaho. The school serves 1,931 students in grades 9-12. The student-to-teacher ratio is 21.2:1.
According to EDFacts assessment data, 55% of students meet grade-level proficiency standards in combined math and reading. The school reports a 84% graduation rate.
22% of students qualify for free or reduced-price lunch.
Centennial High School is part of the Joint School District No. 2 in Idaho.
How This School Compares
Centennial High School has 1,931 students enrolled, making it larger than the average school in Joint School District No. 2 (658 students). Its 55% proficiency rate is 5 percentage points below the district average of 60%. Compared to the Idaho state average of 54%, the school performs 1 points higher. The 21.2:1 student-teacher ratio is above the national average of 16:1.
Frequently Asked Questions
Centennial High School has 1,931 students enrolled in grades 9-12. The student-to-teacher ratio is 21.2:1.
According to EDFacts data, 55% of students at Centennial High School meet grade-level proficiency standards in combined math and reading assessments.
Centennial High School has a 84% graduation rate, measuring the percentage of students who graduate within four years.
Centennial High School is part of the Joint School District No. 2 in Boise, Idaho. You can view all schools in this district on the district page.
All data on this page comes from the National Center for Education Statistics (NCES) Common Core of Data and EDFacts assessment results. These are official federal datasets published by the U.S. Department of Education.
School profiles are built from NCES directory data and EDFacts assessment results. Proficiency rates reflect combined math and reading performance. Graduation rates are reported for high schools with available data.
Source: NCES Common Core of Data, 2026.