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Marathons Found In Ontario in October
View all ↓Marathons in Ontario in October 2025
findarace.com is Canada's favourite event discovery site. Check out our list of October 2025 Marathons in Ontario below.
Race Calendar: Marathons Found In October
Cooper Robertson Foundation – Run With Coops!
Grimsby, ON
03 Oct 25
Free - $20.00
2025 Muskoka Marathon
Bracebridge, ON
05 Oct 25
$24.02 - $143.84
2025 TCS Toronto Waterfront Marathon
Toronto, ON
18 Oct 25
2025 Women's Training Program
Toronto, ON
19 Oct 25
Free
U.S. & International Registrants, Niagara Falls 5k, 10k, Half & Marathon 2025
Niagara Falls, ON
26 Oct 25
$41.50 - $134.09
Niagara Falls 5k, 10k, Half & Marathon 2025
Niagara Falls, ON
26 Oct 25
$41.50 - $139.53
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