That Dam Hill Marathon and Ultra Races are back for 2023! 

September 16, 2023

Springbank Park
1085 Commissioners Road West
London, Ontario, Canada

RACES:

Charity 5K Fun Run/Walk in support of Dunn with Cancer and Indwell
½ Marathon
Marathon
6 Hour Timed Race
12 Hour (Night) Timed Race
24 Hour Timed Race
24 Hour Relay

8:00 AM start time for the 1/2, Full, 6-hour and 24-hour races
1 PM, 2 PM and 4 PM for the Charity 5K Fun Run/Walk events.
8:00 PM for the 12-hour night race

Registration closes September 3. Registrants after August 15 may not get a shirt.


Click here to register for That Dam Hill Marathon and Ultra Races

Please support our designated charities!

That Dam Hill is 100% volunteer-run and 100% of net proceeds from the event go to our charitable partners below. In addition, this event helps our charitable partners raise money independently of the races themselves. Since 2020, over $650,000 has been raised for cancer research by Dunn with Cancer alone!

        Dunn With Cancer logo      

More than a spectator friendly certified marathon race, That Dam Hill Marathon and Ultra Races is also London Ontario’s only ultra marathon timed race. And YES, That Dam Hill is a certified Boston Marathon Qualifier!

And don’t worry, the hill isn’t that big. If anything, it’s more of a molehill.