If you are paid through the fall semester, you must clean out your locker during finals week of the fall semester. If you are paid for fall and spring, you have to clean out your locker during finals week of the spring semester, but not during winter break between semesters. If you are paid through summer, you have to clean out your locker two weeks before school starts. Exception: If you renew your locker, you must clean your locker out by the end of the semester that you paid through, unless of course, it is through summer, and then you will need to clean out two weeks before the fall semester starts.
There is a luggage storage service a short one minute walk from Union Station in downtown Denver - LUGDEN. You can make a reservation online - lugden.com, call - (303) 747-5600, or show up as a walk-in. They offer hourly, day, overnight and weekly bag storage. Great place to store your luggage if you're on a layover from Denver International Airport, or going to a concert, or headed to a Rockies game at Coors field and want to enjoy yourself without having to lug your bags around.