| K | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| 36 | 38 | 40 | 41 | 42 | 46 | 39 | 38 | 40 |
Enrollment by grade, 2024-25 school year, as reported to the WA State Board of Education.
Independent school in Bellevue · K-8 · 360 students (WA SBE, 2024-25) · secular day school exclusively for identified gifted students, NWAIS-accredited
Open Window is the Eastside's only independent K-8 built entirely around one admission rule: no child gets in, or even attends the required visit day, without a cognitive evaluation from a licensed psychologist, submitted directly to admissions. That gate is the product. Because every classmate has already cleared it, the school can start math a grade ahead in kindergarten, staff lower-school rooms with two teachers, and grade middle schoolers purely on demonstrated mastery rather than homework volume. The hard question isn't whether the model works; the competition record below suggests it does. It's whether the model is worth $42,880 to $48,070 a year (2026-27) when public districts run a free version of the same core idea. Bellevue tests kids into its Centered Services cohorts, and neighboring districts do the same under their own Highly Capable labels; our Advanced Learning guide covers how those pathways admit. Tuition buys intensity the free path doesn't offer: roughly 40 kids per grade, counselors embedded for the emotional volatility that often travels with high IQ, mandatory travel designed to build independence, and a concierge placement operation into selective high schools. Families who mainly want acceleration should test the district route first. Families whose child needs the whole environment rebuilt around giftedness are the ones this school exists for.
Researched 2026-07-04. Citations and claim ledger included in the full dossier.
Tuition here runs five figures a year, the question is what it buys over the public schools your address already gives you. A $29 Research Pass unlocks score trends, peer percentiles, competition evidence, gifted-pathway detail, and PTA capacity on every public school in the region, plus 3 full research dossiers for the schools on your shortlist.
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