Open Window School is an independent gifted-only K-8 in Bellevue, founded in 1983 by Mary Ann Simpson and Jean Booker as a preschool for intellectually gifted children and expanded to elementary in 1985. The 7.6-acre campus on Cougar Mountain between Bellevue, Newcastle, and Issaquah serves about 360 students with a 7:1 student-teacher ratio, and admission requires formal cognitive testing and an explicit gifted profile that most peer schools don't ask for.
In Washington's small gifted-K-8 universe, Open Window pairs with The Evergreen School (Shoreline) as the two anchors of the WA gifted-K-8 dyad — both are explicitly gifted-only and NWAIS-accredited at the same national tier. Eastside K-8 alternatives that serve a broader student profile include Eton School (Montessori PK-8), Bellevue Children's Academy, and French American School of Puget Sound (Mercer Island language immersion). Tuition runs around $42,780 at the highest grade, in line with the elite-K-8 tier rather than the parish-school tier.
Class size is small enough that matriculation patterns are visible: a typical 8th-grade cohort of about 40 students fans out to roughly 20 different high schools each year. Common destinations include Lakeside School, The Overlake School, Eastside Preparatory School, University Prep, BASIS Independent Bellevue, The Bear Creek School, and Bellevue Christian School. Because the K-8 program is strongly differentiated, the 9th-grade transition is where families weigh whether the next fit is similarly tailored to gifted learners or shifts toward a more general college-prep environment — Lakeside and Overlake are the most-cited landing spots for families who want continuity in academic intensity.
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