Summary:
Zip code 83402 in Idaho Falls, Idaho is served by a single public high school, Skyline Senior High School, which enrolls 1,336 students in grades 9 through 12 and is part of the Idaho Falls District.
Skyline is the only high school in this zip code, so all attention falls on it. The school has shown a dramatic improvement, jumping from the 32nd percentile statewide in 2024–2025 to the 69th percentile in 2025–2026 and earning a 4-star rating. In the most recent End of Course exams, Skyline beat both district and state averages in math, science, and English language arts, with math proficiency at 41.9% versus 33.1% statewide and ELA at 68.3% versus 61.3% statewide. English language arts is a consistent strength, as Skyline also exceeded state averages on the earlier All Grades tests. However, chronic absenteeism is a concern: 17.3% of students are chronically absent, better than the district’s 18.9% but worse than the state’s 13.8%. The student-teacher ratio is 20.5, meaning relatively large class sizes, and about 41% of students qualify for free or reduced lunch, indicating a moderate level of economic disadvantage.
Parents should be aware that test results vary by measurement. The 2025–2026 End of Course scores are impressive, but the 2024–2025 All Grades scores showed Skyline below state averages in math and science, while still strong in ELA. The graduations rate listed for the school, district, and state are all exactly 82.5%, which is suspicious and likely a data quirk rather than a true match. Spending per student data is from 2018–2019 and too old for current decisions. Overall, Skyline appears to be an improving school with strong recent academic performance, especially in literacy, but families should watch chronic absenteeism and verify future test data to confirm the upward trend.
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