The Toronto Marathon (and Half Marthon) will be run on Sunday, May 6, 2012. It involves some 15,000 runners and can be counted on to make Sunday morning and perhaps some of the afternoon a driving mess. Linked below, courtesy of CITY is a list of road closures, which as you can see is very complex. Still, the marathon will not come through South Bayview although we will feel the impact. List of road closures.