Declo High School is a public high school in Declo, Idaho. It is the second largest high school operated by the Cassia County Joint School District.
Serving 326 students in grades 9-12, Declo Senior High School ranks in the bottom 50% of all schools in Idaho for overall test scores (math proficiency is bottom 50%, and reading proficiency is bottom 50%).
The percentage of students achieving proficiency in math is 30-34% (which is lower than the Idaho state average of 41%). The percentage of students achieving proficiency in reading/language arts is 50-54% (which is lower than the Idaho state average of 55%).
The student-teacher ratio of 19:1 is higher than the Idaho state level of 17:1.
Minority enrollment is 21% of the student body (majority Hispanic), which is lower than the Idaho state average of 28% (majority Hispanic).
Quick Facts (2026)
- Grades: 9-12
- Enrollment: 326 students
- Student-Teacher Ratio: 19:1
- Minority Enrollment: 21%
- Graduation Rate: ≥95% (Top 1% in ID)
- Overall Testing Rank: Bottom 50%
- Math Proficiency: 30-34% (Btm 50%)
- Reading Proficiency: 50-54% (Top 50%)
- Science Proficiency: 20-24% (Btm 50%)
- Source: National Center for Education Statistics (NCES), ID Dept. of Education
Top Rankings
Declo Senior High School ranks among the top 20% of public schools in Idaho for:
Category
Attribute
Graduation Rate
School Overview
Declo Senior High School's student population of 326 students has grown by 10% over five school years.
The teacher population of 17 teachers has declined by 5% over five school years.
Grades Offered
Grades 9-12
(No virtual instruction)
(No virtual instruction)
Total Students
326 students
Total Classroom Teachers
17 teachers
School Calendar
School Motto
Creating Lifetime Learners
School Rankings
Declo Senior High School ranks within the bottom 50% of all 704 schools in Idaho (based off of combined math and reading proficiency testing data).
The diversity score of Declo Senior High School is 0.34, which is less than the diversity score at state average of 0.44. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#410 out of 704 schools
(Bottom 50%)
(Bottom 50%)
Math Test Scores (% Proficient)
30-34%
41%
Reading/Language Arts Test Scores (% Proficient)
50-54%
55%
Science Test Scores (% Proficient)
20-24%
41%
Student-Teacher Ratio
19:1
17:1
Hispanic
21%
21%
White
79%
72%
All Ethnic Groups
Graduation Rate
≥95%
80%
Participates in the National School Lunch Program (NSLP)
Yes
Eligible for Free Lunch
24%
32%
Eligible for Reduced Lunch
11%
7%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), ID Dept. of Education
School Notes
- School Mascot: Mighty Hornets
Frequently Asked Questions
What is Declo Senior High School's ranking?
Declo Senior High School is ranked #410 out of 704 schools, which ranks it among the bottom 50% of public schools in Idaho.
What percent of students have achieved state testing proficiency in math and reading?
30-34% of students have achieved math proficiency (compared to the 41% ID state average), while 50-54% of students have achieved reading proficiency (compared to the 55% ID state average).
What is the graduation rate of Declo Senior High School?
The graduation rate of Declo Senior High School is 95%, which is higher than the Idaho state average of 80%.
How many students attend Declo Senior High School?
326 students attend Declo Senior High School.
What is the racial composition of the student body?
79% of Declo Senior High School students are White, and 21% of students are Hispanic.
What is the student-teacher ratio of Declo Senior High School?
Declo Senior High School has a student ration of 19:1, which is higher than the Idaho state average of 17:1.
What grades does Declo Senior High School offer ?
Declo Senior High School offers enrollment in grades 9-12 (No virtual instruction).
What school district is Declo Senior High School part of?
Declo Senior High School is part of Cassia County Joint School District.
School Reviews
Review Declo Senior High School. Reviews should be a few sentences in length. Please include any comments on:
- Quality of academic programs, teachers, and facilities
- Availability of music, art, sports and other extracurricular activities
Recent Articles
Media Literacy as a Core Skill: How to Tell if a School Teaches It Well
Learn how to evaluate whether a public school teaches media literacy effectively, from fact-checking and source evaluation to digital citizenship and critical thinking.
Screen Time, Paper Learning, and the New Back-to-Basics Debate
Explore why some public schools are reducing screen time, bringing back paper learning, and rethinking the balance between technology and traditional instruction.
Student Data, AI Tools, and Privacy: Questions to Ask Your District
Learn how public schools use AI, protect student data, and the key privacy questions every parent should ask their school district in 2026.
