Spanaway Middle School is on a trimester schedule with three trimesters in the year: Fall Trimester, Winter Trimester, and Spring Trimester. Each trimester is twelve weeks long, and report cards are sent home at the end of each trimester. Progress grades are posted halfway through each trimester, at the six week mark.
- Fall Trimester: September 6, 2018 - November 30, 2018
- Winter Trimester: December 3, 2018 - March 15, 2019
- Spring Trimester: March 18, 2019 - June 18, 2019