The first 7 days of the term is the "add/drop" period for full semester classes (drop/add dates for mini- and micro-term classes will vary--refer to the Student Academic Calendar for these details).
The last day to withdraw from a course without penalty (a "W" grade) is listed each term on the Student Calendar.
Click the calendar to go to the Student Academic Calendar.
NOTE: Withdrawing from a course may impact your financial aid eligibility.