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How To Receive School News and Information

Mount Si High School has an APP for that!  Click here to learn how to download it!


2019-2020 School Year Texting Groups

Due to changes with our previous texting service "Remind,"  we are switching groups to School Messenger.  To sign up for your class texting group please click HERE.



Check this website first for accurate information  It is updated daily.

  • Follow us on Facebook, Instagram, and Twitter .  We post important reminders and showcase student achievements.
  • Sign up for weekly email from us
  • Call us!  We are happy to assist you:  425.831.8100