Three Tree Montessori School
Montessori school · Grades Pre-K–6
Burien, WA
220 SW 160th St, Burien, WA 98166
Overall grade: A-
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- B+Class size
- A-Years serving families
- ADiversity
What stands out
- The only Montessori school in Burien
- Growing: enrollment up 55% since 2011–12
- Serving families in Burien since at least 2011
In Burien, Washington, Three Tree Montessori School is a Montessori school for students from pre-K through 6th grade. About 73 students attend, with roughly 10 students per teacher. Enrollment is up about 55% since 2011–12. The school day runs about 7 hours, 170 days a year.
At a glance
- Grades
- Grades Pre-K–6
- Students
- 73
- Teachers
- 7 (full-time equivalent)
- Students per teacher
- 10.4
- Boys and girls
- Coed · 46 girls, 27 boys
- Religious affiliation
- None (nonsectarian)
- Program
- Montessori
- School day
- About 7 hours
- School year
- 170 days
Reviews
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How it compares
- Larger than 79% of Montessori elementary schools in Washington.
- Compared with 34 Montessori elementary schools in Washington.
Students by survey year
Total students reported in official records since 2011–12.
Students by grade
Student body
Member of
- Association Montessori Internationale
Questions to ask on a tour
- What is tuition, and what does it include (books, fees, uniforms, trips)?
- Do you offer financial aid, sibling discounts or payment plans?
- Do you accept ESA, voucher or tax-credit scholarship funds?
- How big are classes in my child's grade?
- What support is there for students who need extra help or more challenge?
- Is the school accredited, and by whom?
- What do a typical day and a typical week look like?
- How does the school communicate with families?
Questions about Three Tree Montessori School
What grades does Three Tree Montessori School serve?
Three Tree Montessori School serves grades Pre-K–6.
How many students attend Three Tree Montessori School?
About 73 students, with 10 students per teacher, according to official records.
How much is tuition at Three Tree Montessori School?
Call the school to ask about tuition, financial aid and payment plans.
Official record · Updated October 2026 · Official search · Something wrong? Tell us
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