Summary:
Sumner, Washington, has one middle school serving grades 6–8: Sumner Middle School, located in the highly rated Sumner-Bonney Lake School District. The school enrolls 674 students and offers parents a single local middle-school option within a district ranked 13th out of 238 Washington districts, placing it in the state’s 95th percentile.
Sumner Middle School is a strong statewide performer. In 2025–2026, 70.34% of students were proficient in English Language Arts, 55.05% in math, and 56.05% in science—above Washington averages in every subject. English Language Arts is the school’s most consistent strength, with proficiency between 68.92% and 71.09% across sixth, seventh, and eighth grades. The school’s statewide ranking also improved from 94th in 2023–2024 to 72nd in 2025–2026, placing it at the 86th percentile among Washington schools.
For families comparing performance with the district rather than the state, the main opportunities are in math and science. Overall results were below the district averages, although sixth- and eighth-grade math exceeded district performance, and seventh-grade English Language Arts was stronger than the district. Seventh-grade math was the clearest concern at 48.82% proficiency, while eighth-grade science trailed the district by 7.90 percentage points. Math declined by 4.21 points from the prior year, while English Language Arts and science improved modestly. The school reports a 19:1 student-teacher ratio, $17,590 in per-student spending, and 43.62% of students qualifying for free or reduced-price lunch. Overall, it appears to be a high-performing school with especially strong literacy results and targeted areas for academic improvement.
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