The official WSU Academic Calendar lists dates and deadlines for the full (15 week) semester/term. Drop and withdrawal deadlines for less than full semester sessions can be found at Academic Calendar: Session Deadlines.
Ask this question first: Has instruction for the term started? If instruction has started, you can withdraw from the term using myWSU. When instruction has not yet started, we provide campus specific checklists of steps to take.
Instruction has started: Current Term Withdrawal.
Instruction has NOT started: Future Term Withdrawal.