Summary:
Sumner, Washington, has one public high school, Sumner High School, serving grades 9–12 in the Sumner-Bonney Lake School District, a strong suburban-area district near the Tacoma region. The school enrolls 1,857 students and provides a single local option for families seeking a traditional public high school.
Sumner High School performs well on several important measures. Its 2024–2025 graduation rate was 92.8%, more than 10 percentage points above Washington’s 82.6% rate and only slightly below the Sumner-Bonney Lake School District rate of 93.5%. The dropout rate was 4.1%, considerably better than the statewide 9.8% rate, though somewhat higher than the district’s 3.1%. The school ranked in the 78th percentile statewide in 2025–2026, improving from the 72nd percentile the prior year. These results suggest a generally successful school with strong completion outcomes and above-average statewide standing.
English language arts is the school’s clearest academic strength: 77.75% of students were proficient in 2025–2026, compared with 72.44% districtwide and 52.81% statewide. Math and science require more attention. Math proficiency rose from 40.09% to 44.71%, an encouraging gain, but remained 15.52 points below the district average; it was only slightly above the state average. Science proficiency was 47.61%, below both the district’s 61.27% and the state’s 50.95%. For parents, the overall picture is positive—particularly for graduation, ELA, and statewide performance—but families should ask about support and improvement plans in math and science. The reported student-teacher ratio is 22.5 to 1, and about 35% of students qualified for free or reduced-price lunch in 2024–2025.
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