Three Tree Montessori School
Burien, Washington 98166
Visit & contact
- Address
- 220 Southwest 160th Street
Burien, WA 98166 - Phone
- (206) 242-5100
- info@threetree.org
- Website
- threetree.org ↗
Facts & figures
From government filings and independent surveys — not the school's own marketing.
- Student-teacher ratio
24.9 : 1
174 students · 7 full-time-equivalent teachers
U.S. Dept. of Education private school survey, 2021–22
- School day
7 hours/day · 180 days/year
U.S. Dept. of Education private school survey, 2021–22
- Classrooms
2 Infant/Toddler · 5 Primary · 2 Lower Elementary · 1 Upper Elementary
10 lead teachers · 12 assistants
- State license
Licensed child care center
Capacity 234 · licensed since 2003
Washington State DCYF, 2026
Programs, tuition & schedule
Quoted from threetree.org."Guided by the teachings of Dr. Maria Montessori, we provide education for life and are dedicated to helping all children develop into confident, self-motivated, and responsible global citizens."
Accreditation & affiliations
- AMI (Association Montessori Internationale) · recognized member
- PNMA (Pacific Northwest Montessori Association) · active member
- NWAIS · subscriber
Source: school's Our School 1 page ↗
Programs offered
- Toddler — 15 months and up
- Children's House
- Elementary
- Before & After School Care
Source: school's Programs page ↗
Some fields above are blank because they weren't published on the school's site. Call or email the school for tuition, admissions, and other details not listed here.
How to apply
Quoted from threetree.org.- Submit Admissions Inquiry Form
- Review tuition assistance options
Source: school's Admissions page ↗
About Three Tree Montessori School
Three Tree Montessori School is a Montessori school (private) in Burien, Washington serving grades PK-6. Guided by the teachings of Dr. Maria Montessori, we provide education for life and are dedicated to helping all children develop into confident, self-motivated, and responsible global citizens.
Where is Three Tree Montessori School located? ⌃
220 Southwest 160th Street, Burien, WA 98166
What is the phone number for Three Tree Montessori School? ⌃
Three Tree Montessori School can be reached at (206) 242-5100.
Is Three Tree Montessori School accredited? ⌃
Three Tree Montessori School lists the following accreditations or affiliations on its website: AMI (Association Montessori Internationale) (recognized member), PNMA (Pacific Northwest Montessori Association) (active member), NWAIS (subscriber).
How do you apply to Three Tree Montessori School? ⌃
Three Tree Montessori School's admissions process: Submit Admissions Inquiry Form; Review tuition assistance options.
What ages does Three Tree Montessori School serve? ⌃
Three Tree Montessori School serves grades PK-6.
What is the website for Three Tree Montessori School? ⌃
The official website is threetree.org.