Example course schedule from August 2017
The course schedule dictates the default course on Zwift on any given day. The course schedule is released on a monthly basis. The course changes at 9pm PST (UTC -8) every day. The most common course on the schedule is Watopia and the least is Richmond.
Contrary to popular belief, it is possible to ride a course even when it is not the course of the day on the course schedule. However, all group rides and races take place on the course of the day and other courses are rarely used.