New for 2021, there will be an 8-hour charity fun relay, and a 24-hour competitive relay race.

8-Hour Charity Fun Relay

The charity fun relay is a fun run that you can do with a team of friends. Proceeds raised by your team can be earmarked for either of our two official charities — Indwell and Dunn With Cancer.

Time: Saturday September 18 from 12:00 noon to 8:00 PM

Team Size: Unlimited.  We recommend a team size of at least 10 people, but if you can get 25+ people helping out, that is fine.

Laps: Each runner may run as many laps as they want. The runner with the race number bib may have up to two other team members run with them.

Cost:  $50 per participant — minimum $500 per team.

Swag: NONE.  100% of the proceeds from registration fees will go to our two charitable partners, Dunn with Cancer and Indwell.  Please contact us if you’d like to purchase That Dam Hill shirts or participation medals for your team members before August 15, 2021.


  • There will be a separate (red LED) clock for the 8 hour Charity Fun Relay

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

24-Hour Competitive Relay Race

The competitive relay is a run designed for folks who want want to test their endurance as part of a team.

Time: Saturday September 18 at 8:00 AM to Sunday September 19 at 8:00 AM

Team Size: 8 people max.  That works out to an average of 3 hours of running per runner.

Laps: Each runner completes exactly 3 laps — no more, no less — before handing the race number bib to the next runner.  Each team’s runners complete their laps in the same order.

Cost:  Ranges between $680 if registered by July 31 to $880 if registered after September 1.

Swag: That Dam Hill hoodie running shirt, relay team participants medal.

Prizes: There will be awards for the 1st, 2nd and 3rd teams who complete the most laps within the 24 hour time limit for the race.

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