Burien · Licensed center
Three Tree Montessori
At a glance
- Large Montessori center, licensed for 234 children.
- Hours 9 a.m. to 3:15 p.m., 5 days a week, school year.
- Tuition Toddler $2,051, preschool $1,445 a month, full time. See costs
What to know
The license is the range the state allows. It does not say which ages have openings.
What the state has found
The state cited rules at 2 of its 4 licensing inspections since March 2023. It lists no valid complaint about this center.
See each inspection
Licensing inspections
- Dec 4, 2025Nothing cited
Jun 10, 20251 citation
Safety requirementsSerious. Fix within 5 business days. The licensor rechecks within 10.
“Licensor observed a bottle lid that posed a choking hazard accessible to the toddlers.”
WAC 110-300-0165(2)(a)
Apr 29, 20241 citation
Safety requirementsSerious. Fix within 5 business days. The licensor rechecks within 10.
“Licensor observed one outlet (top socket) next to the sink in the Madrona restroom, equipped with GFCI but is not tamper-resistant.”
WAC 110-300-0165(5)(b)
- Mar 15, 2023Nothing cited
The state cited rules at 2 of this center's 4 inspections. Most Seattle-area centers inspected 4 times had more: 62% of 272 had rules cited at 3 or more.
How all 272 Seattle-area centers inspected 4 times compare
Of the 272 Seattle-area centers the state inspected 4 times, how many of those inspections cited a rule:
- None7%
- 1 of 415%
- 2 of 417%This center
- 3 of 433%
- All 429%
Read every record and the state’s reports
State record — Washington DCYF
- Last visit
- December 4, 2025
- On file
- 4 visits since March 2023 — 2 cited nothing
- Most serious
- Serious —
Licensor observed a bottle lid that posed a choking hazard accessible to the toddlers.
· June 10, 2025
Washington DCYF publishes each citation in the licensor’s own words, with a risk level.
Jun 2025 Licensing visit 1 finding
Licensing visit · June 10, 2025
WAC 110-300-0165(2)(a) · Serious
Licensor observed a bottle lid that posed a choking hazard accessible to the toddlers.
Apr 2024 Licensing visit 1 finding
Licensing visit · April 29, 2024
WAC 110-300-0165(5)(b) · Serious
Licensor observed one outlet (top socket) next to the sink in the Madrona restroom, equipped with GFCI but is not tamper-resistant.
Shortlist replaces people’s names in the state’s text with initials. This is done by rule, not by hand, so it can miss a name or shorten a word that isn’t one. The state’s report, linked on each row, has the original.
What it costs
$19.08 an hour, before fees
Three Tree MontessoriMost Seattle-area prices (middle 80%)
Monthly, full time. The band is the middle 80% of Seattle-area full-time prices for that age; 82 toddler and 113 preschool programs publish one.
Per hour: a year of tuition, divided by the hours of care it buys.
- Half day (morning)
- $1,551 to $1,654 a month
- Application fee
- $75
- Deposit
- $550, not refundable
- Siblings
- 10% sibling discount on the lowest tuition rate(s) for the 2nd and each subsequent child attending in the same school year
A day here
9 a.m. to 3:15 p.m., 5 days a week, school year
Schedule
- Schedule
- Half-day and full-day
How they teach
Montessori
“The Mission of Three Tree Montessori School is to offer AMI-recognized Montessori education to the students of South King County.”
What staff are paid
- Afterschool Support Staff - Elementary Level
- $20.63 an hourJob posting, seen October 2026
Details
- Phone
- (206) 242-5100
- Address
- 220 SW 160 St, Burien, 98166
- License
- PL-10835
- Quality program
- Early Achievers Level 3
We couldn’t find some information that may matter to your decision: openings, Working Connections subsidy, ratios and staff, a typical day, sick and biting policies, and who owns it. We can ask the program for you and copy you in.
Sources and dates
Where every fact on this page came from, and when Shortlist last checked it against that source. Anything Shortlist could not source is named here rather than left blank.
How they teach
- Approach — Checked July 2026 threetree.org
What it costs
- Toddler, Second price, Application fee, Deposit, Sibling discount — Checked September 2026 threetree.org
- Preschool — Checked July 2026 threetree.org
- Program year, Closed days — Checked October 2026 threetree.org/…/2026-2027-TTMS-Overview-Calendar.pdf
What staff are paid
- Afterschool Support Staff - Elementary Level — Checked October 2026 threetree.org
State record
From Washington DCYF’s published reports, last checked November 3, 2026.
Washington’s four risk levels, highest first: Immediate, Serious, Short Term, Long Term. Deadlines from DCYF procedure PRO 10.1.21.
Ages
A day here
- Hours, Calendar, Schedule — Checked September 2026 threetree.org
Details
- Phone, Ages on the license — Checked September 2026 findchildcarewa.org
- Website — Checked July 2026 threetree.org
- Address, License — Checked June 2026 data.wa.gov
- Quality program — Checked April 2026 data.wa.gov
Large means the biggest quarter of Seattle-area’s 855 licensed centers by state-licensed capacity: 116 to 323 children. Small is 6 to 40; medium is 41 to 115.
The ages on the license are what the state licenses it to care for, which can be wider than the ages it takes.