Summary:
Declo, Idaho is served by a small public school system of three schools—Declo Elementary School, Declo Junior High School, and Declo Senior High School—all part of the Cassia County Joint District, serving roughly 1,028 students across grades PK–12. Overall, this rural district ranks in the middle of Idaho schools, but the individual schools tell very different stories.
Declo Junior High School is the standout performer, ranking in the 55th percentile and beating the state in math proficiency (51.5% vs. 43.1%) while keeping chronic absenteeism low at 7.4%. Its 6th graders are especially strong in both math and English. In contrast, Declo Elementary School is the biggest concern—its ranking plunged from the 62nd to the 28th percentile in one year, with 5th grade math proficiency at just 24.7%. Declo Senior High School is a mixed bag: it boasts excellent ELA scores (76.5% proficiency, far above the state) and remarkably low absenteeism (3.1%), but its math proficiency is only 23.5%, well below the state average.
For parents, the key takeaway is that the middle school offers the most consistent academics, while the high school is strong in reading and writing but needs help in math. The elementary school’s recent slide, especially in 5th grade math and science, is the most urgent issue. On the positive side, attendance is excellent at all three schools, and spending per student doesn’t appear to drive results—the middle school spends the least yet performs best. If you have children approaching 5th grade or entering high school math, it’s worth asking the district about targeted support in those areas.
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