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Senior Celebration Activities

It is a MSHS tradition for the parents of underclassmen to “pay it forward” and volunteer at the seniors’ celebration events! The MSHS PTSA could use adult volunteers to help organize participants at the Senior Students’ Car Parade on June 4 ( and to help chaperone the Grad Night festivities on June 10-11 ( Please sign up if you can help!

Please share this with your neighbors and local businesses as we need lots of donations and sponsorships. We are a 501(c)(3) so you can have your company match your donations too!

Grad Night Registration Is Open!

Grad Night is an annual all-night all-inclusive party that allows seniors to celebrate together one last time after graduation. More than "just a party," Grad Night is a commitment by parents, school, and the community to conduct a great, once-in-a-lifetime celebration that is alcohol and drug-free on a night that is statistically one of the most dangerous nights of our children’s lives. For more information, visit

Graduation Lei Sales

Celebrate your 2022 Graduation by wearing Traditional Hawaiian Graduation Leis

As has become a MSHS tradition, the Mount Si High School PTSA is proud to be once again offering the traditional Graduation Hawaiian Leis!


The cost is $25 each and you can choose either White or Purple (or both). There is also an option that will allow you to purchase a Lei for a student who may not be able to participate in this long-standing tradition.Leis will be on sale until May 27th.The sales will help support the Senior Celebrations.  If you would like to volunteer to help plan, please email

Staff Appreciation Events

Mount Si High School has exceptional staff! The PTSA puts on small monthly events and a week long staff appreciation event in May. If you would like to contribute to these events to show your appreciation of our hard working staff please click here to make a donation.

Free teen access to YMCA gym
The Snoqualmie YMCA is offering free use of the Basketball gym for teens 5th - 12th grades. Monday - Friday 2:30 - 5:00pm and on weekends from 12:30 - 3:00pm   ... read full article

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May 22
Jun 1
6:00p Senior Parade
Senior Parade

Saturday, June 4
6:00p - 7:00p
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