The average private school tuition in Washington is $15,804 per year (2026-27).
The private elementary school average tuition cost is $15,588 per year and the private high school average is $17,619 per year.
The private school with the lowest tuition cost is Capital Montessori School, with a tuition of $1,060.
Quick Facts (2026-27)
- # WA Schools Ranked: 355
- Top 20 Range (Tuition): $1,060–$2,810
- WA School Avg.: $15,150
- National School Avg.: $12,181

















