We would like to welcome our returning and new MSHS families to the 2019-2020 school year AND provide you with information on how you can get involved this school year!   

Please take a look around to learn more about what we do, how we support the students, staff and parents, AND volunteer opportunities.

MSHS PTSA addresses issues that are important to our parents, teachers and students. Some of the key items we focus on during the school year are listed in the table below.  

Parents Teachers Students Association
Education seminars Classroom Wish Lists Welfare Membership
Parental Involvement Appreciation School Culture  
Financial and Volunteer Support Recognition Recognition  
    SAT/ACT Prep  

 

HOW TO GET INVOLVED!

 

 

Join or renew your annual PTSA membership.  There are many benefits of being a member, CLICK HERE to find out!

The information you provide to us here will enable us to communicate to you in a timely and accurate manner during the school year.  

 

Make a donation anytime during the school year.

 

 

 

Volunteer for PTSA programs and events.

 

 

 

Like Us On Facebook.  Information on PTSA programs and events are posted here on our website AND on Facebook.  

 

Back To School Information
Mount Si High School (MSHS) School office hours:  MSHS main office will open  August 20 , 7 a.m. - 3 p.m. (The office will be closed daily 11:45 a.m. - 1 p.m.) Counseling Center opens  August 21  (425-831-8150). Attendance Office opens  August 23  (425-831-8200). See  summer hours .   ( NOTE:  All MSHS offices are closed for training August 22, 7 a.m. - 12:30 p.m. And, Finance Office is closed for training August 23, 7 a.m. - 12:30 p.m.)  Back-to-school events: Fall Sports late registration will re-open August 16 until August 19 at noon.  See details . MSHS student orientation  and tours ... read full article

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10:00a PTSA Board Meeting
PTSA Board Meeting

Date:
Monday, August 19
Time:
10:00a - 12:00p
Where:
MSHS Main Campus
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View in Outlook or Google Calendar      See full calendar