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Ultra Marathons Found In Ontario in August
View all ↓Ultra Marathons in Ontario in August 2025
findarace.com is Canada's favourite event discovery site. Check out our list of August 2025 Ultra Marathons in Ontario below.
Race Calendar: Ultra Marathons Found In August
Persistence Backyard Ultra
Arva, ON
02 Aug 25
Bluewater International Gran Fondo 2025
Sarnia, ON
03 Aug 25
Middle Path Trail Race
Peterborough County, ON
09 Aug 25
$23.83 - $110.15
Couch To a Voyageur
North Bay, ON
10 Aug 25
$74.58
2025 Gran Fondo Lake Huron
Southampton, ON
16 Aug 25
$28.49 - $180.11
Mudskipper Canadian Individual SwimRun Championships and Parry Sound 15K Ultra Swim
Parry Sound, ON
17 Aug 25
$4.00 - $231.00
Share the Road Gran Fondo
Milton, ON
17 Aug 25
$56.20 - $245.02
Share the Road Gran Fondo 2025
Milton, ON
17 Aug 25
$56.71 - $247.33
The Runway 2025
Breslau, ON
30 Aug 25
Free - $51.26
Showing 1-9 of 9 results