That Dam Hill

SEP

19

2026

That Dam Hill offers timed races in London, Ontario, including a Boston-qualifying marathon and 6 to 24 hour ultra events. It's a volunteer-run event where all net proceeds support cancer research. The races take place at Springbank Park.

Sat 19 Sep 2026

Byron, Ontario

Website

Marathon Half Marathon 5 kilometers

Always double-check with the organizer's website! This page may contain affiliate links.

That Dam Hill Marathon and Ultra Races

The That Dam Hill event features several timed races at Springbank Park in London, Ontario, Canada. The races include a marathon, a half marathon, and a charity 5K fun run/walk. There are also timed events of 6 hours, 12 hours (night), and 24 hours, plus a 24-hour relay. The marathon course is a certified Boston Marathon qualifier.

The event is 100% volunteer-run. All net proceeds from the event go to the charitable partner. The event supports Dunn with Cancer and has helped raise funds for cancer research. Visit the organization's website for the most recent information.

Marathon

Half Marathon

½ Marathon

5 km

Charity 5k Fun Run/walk

6 Hour Timed Race

24 Hour Timed Race

24 Hour Relay

12 Hour (night) Timed Race