Summary
Kettle Moraine High is a public high school serving grades 9–12 in Wales, Wisconsin, with 869 students, and is part of the Kettle Moraine School District. It is a strong school by any statewide measure: in 2025-26 it ranked 29th of 533 high schools in Wisconsin — the 95th percentile, earning 5 stars — and it has stayed in the top quartile for most of the past decade. Its graduation rate is 96.1%, its dropout rate is just 0.1%, per-pupil spending is $15,239, and the student-teacher ratio is 15.5.
Within its own district, however, Kettle Moraine High is not the top-ranked school. High School of Health Sciences ranks #1 statewide and KM Global School ranks #28, with both outperforming Kettle Moraine High in English language arts and math; School for Arts and Performance is #88 and KM Connect is #423. Those specialty schools are much smaller, ranging from 35 to 176 students, so they are not direct comparisons. Among nearby comprehensive high schools, Arrowhead High (#7, in the Arrowhead Union High School School District) and Pewaukee High (#20, in the Pewaukee School District) generally score higher in core subjects. Kettle Moraine High leads West High, North High, and eAchieve Academy, all in the Waukesha School District, in all four tested subjects.
Test scores improved markedly in 2025-26: 72.1% proficiency in English language arts, 65.67% in math, 66.84% in social studies, and 63.52% in science — roughly 18 to 24 points above state averages and near district averages, with math essentially matching the district. The clearest area to watch is chronic absenteeism at 13.5%, which is better than the state (17.3%) but above the district (8.5%) and above Arrowhead (4.6%) and the district's small specialty schools. Subgroup performance is broadly strong, with the school ranking in the 96th percentile for female students, 93rd for special education students, and 85th for low-income students.
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