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Chinook Middle School
18650 42nd Avenue South SeaTac, WA 98188

Office Hours:

Monday-Friday: 7:30 a.m. - 3:30 p.m.

Chinook Middle School
18650 42nd Avenue South SeaTac, WA 98188

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Welcome to Chinook Middle School

Register now for 2025-26 athletics

Register Now for 2026-27 Athletics

All students must be fully registered and cleared before the first day of practice to participate. Don't wait—register early to make sure you're ready to play. 

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Upcoming Events

Latest News

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ParentSquare has made it easier to stay connected. Tap the bell icon to view recent posts, messages, alerts and events across your schools, with unread notifications clearly marked. Make sure notifications are enabled in ParentSquare and your phone settings.

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Jump Start is August 19- 21. This free program is open to all incoming students who are registered for kindergarten at a Highline elementary school and helps students and their families prepare for school.

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This summer, Highline updated how staff contact information is shared online to better protect the privacy and security of our staff. We removed the public staff directory from our district and school websites. Families can continue to find and contact staff through ParentSquare. 

Family Action Committee collaborating

We are looking for Highline family members to join the Superintendent's Family Action Committee (FAC) for the 2026-28 school years. The FAC strengthens the connection between families and Highline Public Schools by providing feedback on policies, informing family engagement, and keeping Highline accountable for its strategic plan goals.

Be You at Highline

This Pride Month, we're highlighting students and staff who help create spaces where everyone feels seen, valued and supported. Across Highline that looks different from school to school.

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End-of-year secondary report cards are now available in ParentVUE. A report card communicates your student’s learning progress during the grading period. All Highline schools use standards-based grading, and students’ scores reflect this.

Superintendent Ivan Duran

A message from Superintendent Ivan Duran. "As we wrap up another school year, I hope you'll take a moment to reflect on the memories that will stay with your family long after summer begins." 

Our Vision

Together we create and sustain a culture of achievement where all students excel!

Explore our Vision