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Marathons Found In Ontario in May

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Marathons in Ontario in May 2025

findarace.com is Canada's favourite event discovery site. Check out our list of May 2025 Marathons in Ontario below.

Race Calendar: Marathons Found In May

Marathons For Mental Health 5k/10k Race

London, ON
24 May 25
$58.35 - $78.85

SudburyROCKS 2025

Greater Sudbury, ON
25 May 25
Free - $520.16
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