School District 158 2025-2026 Calendar. If additional days are needed for either students and/or staff, they will be added to the end of the school year accordingly. Issaquah's school calendar is established in cooperation with staff and the board of directors.

Issaquah’s school calendar is established in cooperation with staff and the board of directors. If additional days are needed for either students and/or staff, they will be added to the end of the school year accordingly.