12 Hours Ultra Running Events in Ontario

All 50 KM 50 Miles 100 KM 100 Miles 6 Hours 12 Hours 24 Hours

Date	Event	City	Distances
07/25/26	Tally in the Valley	Dundas	6 Hours , 12 Hours , 12 Hours , 24 Hours , 100 Miles
09/19/26	That Dam Hill	London	6 Hours , 12 Hours , 24 Hours
09/19/26	Sugarbush Shenanigans	Hillier	6 Hours , 6 Hours , 12 Hours , 12 Hours , 12 Hours , 12 Hours , 24 Hours , 24 Hours
09/26/26	The Tail Chaser	Caledon	6 Hours , 12 Hours , 24 Hours

Date	Event	City	Distances
06/27/26	Utopia Backyard Ultra	Utopia	Backyard , 6 Hours , 12 Hours , 24 Hours
06/27/26	High Noon 24Hr Trail Race & Relay	Thunder Bay	4 Hours , 6 Hours , 12 Hours , 24 Hours
05/09/26	Conquer the Canuck Marathon Ultra Trail Weekend	Cambridge	12 Hours , 50 KM
05/17/25	Coach D's Backyard Ultra	Lindsay	6 Hours , 12 Hours , 24 Hours
05/17/25	Big D’s Backyard Ultra and Trail Race	Lindsay	Backyard , 6 Hours , 12 Hours , 24 Hours
07/23/16	Dirty Girls' Trail Race	Mansfield	6 Hours , 12 Hours , 24 Hours , 48 Hours
08/03/15	Tourne en Rond	Quebec	6 Hours , 12 Hours
09/29/12	Self-Transcendence 6 Hr, 12 Hr & 24 Hr Race	Ottawa	6 Hours , 12 Hours , 24 Hours
08/27/88	Burlington Runners	Burlington	12 Hours , 24 Hours , 50 Miles