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Wildcat Day
We are excited to welcome all incoming ninth graders and new students on Tuesday, August 25!
That's A Wrap!
Congratulations to the Class of 2026! Relive the magic on our Graduation Hub or with our highlight video.
Senior Awards Ceremony
Families, faculty and friends celebrated our seniors outstanding achievements at Senior Awards Night.
Seniors Earn Over $100K in Local Scholarships
Local organizations, businesses, and community partners awarded $103,000 in scholarships to Mount Si High School seniors during this year’s Donuts with Donors celebration.
Top of the Class
News & Announcements
![Happy Labor Day | No School September 7]([{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_1/v1788472541/svsd410org/jhskfrl0yafpyozwbesh/RedWhiteModernHappyLaborDayInstagramPost.png","width":256},{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_2/v1788472541/svsd410org/jhskfrl0yafpyozwbesh/RedWhiteModernHappyLaborDayInstagramPost.png","width":512},{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_3/v1788472541/svsd410org/jhskfrl0yafpyozwbesh/RedWhiteModernHappyLaborDayInstagramPost.png","width":800},{"url":"https://resources.finalsite.net/images/f_auto,q_auto/v1788472541/svsd410org/jhskfrl0yafpyozwbesh/RedWhiteModernHappyLaborDayInstagramPost.png","width":1080}])
There will be no school on Monday, September 7. We hope everyone enjoys the long weekend and takes time to rest and recharge!
![MSHS Picture Makeup Day]([{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_1/v1788544302/svsd410org/qaggokmghengmcocsftl/31df88a4-9295-4a9a-93d1-a955decc1436.jpg","width":256},{"url":"https://resources.finalsite.net/images/f_auto,q_auto/v1788544302/svsd410org/qaggokmghengmcocsftl/31df88a4-9295-4a9a-93d1-a955decc1436.jpg","width":500}])
This is for students who were absent during the first photo days on August 27 and 28. For makeup day, students will receive a slip to go get their photo taken in the library. Running Start students can come anytime between 8 a.m. and 1 p.m.
![Math tutoring by MSHS math teachers starts Wednesday, September 9.]([{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_1/v1788197907/svsd410org/k7ezgspi7jq4irlgyxhz/MathTutoring.png","width":256},{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_2/v1788197907/svsd410org/k7ezgspi7jq4irlgyxhz/MathTutoring.png","width":512},{"url":"https://resources.finalsite.net/images/f_auto,q_auto/v1788197907/svsd410org/k7ezgspi7jq4irlgyxhz/MathTutoring.png","width":800}])
Starting September 9, MSHS math teachers will provide after-school tutoring for Algebra 1/Geometry and Algebra 2/Precalcus on Mondays, Wednesdays, and Thursdays.
![Class of 2027- Senior Portrait Info You Need!]([{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_1/v1781738297/svsd410org/ncoj2430cewcju7cmlvg/SeniorPhotodue800x800px.jpg","width":256},{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_2/v1781738297/svsd410org/ncoj2430cewcju7cmlvg/SeniorPhotodue800x800px.jpg","width":512},{"url":"https://resources.finalsite.net/images/f_auto,q_auto/v1781738297/svsd410org/ncoj2430cewcju7cmlvg/SeniorPhotodue800x800px.jpg","width":800}])
Submit your senior portrait for the Class of 2027 by December 4, 2026 to be included in the yearbook.
![PSAT/SAT School Day Testing Information]([{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_1/v1787603208/svsd410org/sepnlpamuyltwmkmxghd/PSATSATInformation.png","width":256},{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_2/v1787603208/svsd410org/sepnlpamuyltwmkmxghd/PSATSATInformation.png","width":512},{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_3/v1787603208/svsd410org/sepnlpamuyltwmkmxghd/PSATSATInformation.png","width":800},{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_4/v1787603208/svsd410org/sepnlpamuyltwmkmxghd/PSATSATInformation.png","width":1200},{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_5/v1787603208/svsd410org/sepnlpamuyltwmkmxghd/PSATSATInformation.png","width":1600},{"url":"https://resources.finalsite.net/images/f_auto,q_auto,t_image_size_6/v1787603208/svsd410org/sepnlpamuyltwmkmxghd/PSATSATInformation.png","width":2200}])
Mount Si High School will administer the SAT, PSAT and PSAT/NMSQT during the school day on Friday, October 23, 2026.
Testing will begin at 7:50 a.m. and is expected to conclude by 12:00 p.m. Students participating in testing will not be eligible for early dismissal during the testing session.
Upcoming Events
all day
Mount Si High School
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District Office Board Room
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whole building
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Upstairs Hallway
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District Office Board Room
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webinar
By The Numbers
2,088
Students Enrolled
97%
Graduation Rate
2019
New Campus Opened
156
Teachers