Cornerstone Montessori

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Cornerstone Montessori Cornerstone serves children twelve months through 5th grade through various academic and after schoo Visit our webpage for more information

Cornerstone offers full time and part time preschool & kindergarten classes, toddlers, and Elementary up to 6th grade. Each class is staffed with a Certified Montessori teacher and an assistant when needed. Extended Care Opportunities are available from 6:30am to 5:30pm. Extended care programs include breakfast served from 6:30am to 8:00am and an afternoon snack.

09/22/2026
09/05/2026
08/17/2026

Loving our little classroom and new playground!

08/06/2026

Assembling the new Puyallup playground! ❤️ more updates coming soon! Cornerstone Montessori School - Puyallup

Hello Facebook! We are excited to announce our Puyallup location’s open house on 08.20.2026, 3–5 PM. Please take a look ...
08/04/2026

Hello Facebook!
We are excited to announce our Puyallup location’s open house on 08.20.2026, 3–5 PM.

Please take a look at our flyer and message us for further information.

Website: https://www.cornerstonemontessori.online/parttime

12/17/2025

Cornerstone Sumner Campus is closed for the day due to lack of power. PSE does not have an estimated restoration time.

12/17/2025

SBLSD will be two hours late. We have confirmed Cornerstone is without power. Per policy, before school care is canceled. Students can be dropped off between 9am and 9:15am.

If Cornerstone does not have power fully restored by 8am, school will be cancelled for the day.

We hope all are safe. We do have families willing to support those with flooding and without power. Please reach out to Ms. Stacy and she will connect you.

12/17/2025

Possible Power Outage ⚡️

Good morning Cornerstone families,

We are currently investigating whether the school has power. A team member is headed to the school now to verify and we will update you shortly.

Thank you,
Emily

10/27/2025

All Sumner & Bonney Lake schools are closed Monday, Oct. 27, due to widespread power outages & road closures. Well over half of Cornerstone staff members have been without power multiple days. Per our Inclement Weather policy, Cornerstone's toddler, primary and elementary programs will close entirely as well. We have every hope and belief that we will be able to reopen with plenty of teachers on Tuesday, October 28th. Thank you for your understanding as we prioritize safety for our staff and students.

Address

1644 Gault Street
Sumner, WA
98390

Opening Hours

Monday 6:30am - 5:30pm
Tuesday 6:30am - 5:30pm
Wednesday 6:30am - 5:30pm
Thursday 6:30am - 5:30pm
Friday 6:30am - 5:30pm

Telephone

+12539877239

Website

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