The registration program for Fall/Winter City Recreation Programs begins September 14 at 7:00 A.M. for Toronto and East York (other parts of the city have different dates).
Information on the programs is available here
Pro Tip: In this Toronto Star article (August 31), the city has stated that there have been some interim improvements to the registration process, and a private citizen has launched his own mobile app to help residents who have found the process difficult and frustrating in the past.
City of Toronto improving ‘nightmare’ system for recreation programs (thestar.com)