The That Dam Hill Marathon and Ultra Races 2025 is a celebrated running event scheduled for Saturday, 20 September 2025, in Springbank Park, London, Ontario. Participants can choose from multiple race distances: Half Marathon (21.1 km), Marathon (42.195 km), 6-hour, 12-hour (night), 24-hour timed races, a 24-hour relay, and a Charity 5K Fun Run/Walk. The course is a certified 1.4-mile (2.325779 km) loop, and the event is a Boston Marathon qualifier. Organized entirely by volunteers, all net proceeds support cancer research through the Dunn with Cancer initiative, which has raised over $1.2 million since 2020. The event fosters a supportive and festive atmosphere, welcoming runners and walkers of all abilities.
Races
100 km
100 km
50 miles
50 miles
Marathon
Half Marathon
5 km
Race Date:
20 September, 2025
Kicking off at 8:00 AM, this 24-hour challenge invites runners to test physical and mental limits while looping Springbank Park’s certified course. Held on September 20, 2025, and organized by the TDH Organizing Committee, this ultra event rewards participants who reach 100 km or more with a custom belt buckle, celebrating true endurance.
Weather based on historical averages.
FAQs
What is the That Dam Hill 24 Hour?
How long is the That Dam Hill 24 Hour?
Where does the That Dam Hill 24 Hour take place?
What is the elevation gain of the That Dam Hill 24 Hour?
How can I prepare for the That Dam Hill 24 Hour?
How do I choose the right training plan for the That Dam Hill 24 Hour?
Kicking off at 8:00 AM, this 24-hour challenge invites runners to test physical and mental limits while looping Springbank Park’s certified course. Held on September 20, 2025, and organized by the TDH Organizing Committee, this ultra event rewards participants who reach 100 km or more with a custom belt buckle, celebrating true endurance.
The That Dam Hill 24 Hour is 100km long.
The That Dam Hill 24 Hour takes place in London, ON, Canada.
Runna classifies the That Dam Hill 24 Hour elevation profile as Rolling.
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the That Dam Hill 24 Hour?
Kicking off at 8:00 AM, this 24-hour challenge invites runners to test physical and mental limits while looping Springbank Park’s certified course. Held on September 20, 2025, and organized by the TDH Organizing Committee, this ultra event rewards participants who reach 100 km or more with a custom belt buckle, celebrating true endurance.
How long is the That Dam Hill 24 Hour?
The That Dam Hill 24 Hour is 100km long.
Where does the That Dam Hill 24 Hour take place?
The That Dam Hill 24 Hour takes place in London, ON, Canada.
What is the elevation gain of the That Dam Hill 24 Hour?
Runna classifies the That Dam Hill 24 Hour elevation profile as Rolling.
How can I prepare for the That Dam Hill 24 Hour?
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the That Dam Hill 24 Hour?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
More
Sport:
Running
Qualifier:
Boston Marathon Qualifier
Tags:
Boston Marathon Qualifier
Night Run
Relay
Fun Run
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by That Dam Hill Marathon and Ultra Races 2025 or TDH Organizing Committee. All event details are based on publicly available information and are provided solely to help users discover running events. Runna does not use any official logos, images, or proprietary content from this event or its organiser. Any trademarks or names mentioned are used descriptively to identify the event in a factual manner. For the most accurate and up to date information (including to register or purchase an entry to the event), please visit the That Dam Hill Marathon and Ultra Races 2025 website.
