Summary:
Zip code 83623 contains one high school, Glenns Ferry High School, serving grades 9–12 in the rural community of Glenns Ferry, Idaho. Because this is the only high school in the area, the most useful comparisons are against the Glenns Ferry Joint District and Idaho statewide averages.
Glenns Ferry High School is a very small school with 128 students and a 13.3:1 student-teacher ratio, which allows for more individualized attention. A majority of students (51.56%) qualify for free or reduced-price lunch, reflecting a largely low-income population. The school’s graduation rate of 82.5% exactly matches the state average, and its chronic absenteeism rate of 11.0% is better than both the district (15.4%) and state (13.8%). Academically, the school’s all-grades ELA proficiency in 2024–2025 was 52.6%, nearly matching the state’s 53.9% and well above the district’s 40.2%. Science proficiency (32.4%) also topped the district (28.4%), though it lagged the state (42.6%). However, math proficiency was a clear weakness: only 23.7% of students were proficient, compared to 28.0% for the district and 43.1% statewide. End-of-course results were also concerning, with ELA proficiency at 33.3% versus 61.3% statewide and science at 30.8% versus 41.2%.
The school’s state ranking has been volatile, improving from the 4th percentile in 2017–2018 to the 21st percentile in 2024–2025, then dropping to the 11th percentile in 2025–2026. It has consistently received a 1-star rating. Per-student spending is dated at $11,690 from 2018–2019. In summary, Glenns Ferry High School offers a supportive, small-school environment with solid attendance and a graduation rate on par with the state, but it struggles significantly in math and advanced-course performance. Families should be aware that while the school shows relative strengths in reading and science compared to its district, it remains below Idaho’s state averages in most subjects, with mathematics being the most critical area needing improvement.
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