Registration for all races are now open. 

Official online sign up for the Greater Yellowstone Adventure Series races has always opened at high noon
(12:00 PM) Mountain Standard Time on March 1. The reason? It was on March 1, 1872 that the US
Congress established Yellowstone National Park in what was then the Territories of Montana and
Wyoming. The region had only been explored once and had barely been surveyed. But, President Grant
had the foresight to create the world’s first national park. Good Call!

We are now open for online registration for all eight of our races.  The signup links are below.  The race packets can be found in the Races page of this site.  If you prefer to signup off-line, please download and fill out this form             and mail the form and payment as instructed.  For the race entry fee, insert the amount listed on the signup links below on   Please also send us an email to to let us know that you've signed up in this way.

Finally, please sign up for our free newsletter so you’ll always be in the loop. Contact us by email anytime if you
have questions. See you this summer!

Race Day: July 16, 2020

The 9th Annual Madison Triathlon is the first leg of the Madison Trifecta.

The 9th Annual Madison Duathlon is the second leg of the Madison Trifecta.



Race Day: July 18, 2020

The 13th Annual Madison Marathon is the final leg of the Madison Trifecta.  The 12th Annual Madison Half Marathon is run on the same route at the same time with the same check in.


Race Day: July 19, 2020

The 6th Annual Big Sky Marathon is the second half of our double marathon weekend.  The 5th Annual Big Sky Half Marathon is on the same route and starts at the same time with the same check in.


This will be the 6th year that we offer a Double Marathon. It is the only double marathon in Montana offered by a series. Marathon Maniacs can earn four stars by doing these two races over this weekend in July.
This will be the 5th year that we offer a Double Half Marathon. It is the only double half marathon in Montana offered by a series. Marathon Half Maniacs can earn four stars by doing these two races over this weekend in July.
July 16, 17, and 18th
This is the 9th year we are offering the Madison Trifecta. If you complete all three of these races in just a
four-week time span, you will earn a T.B.A. award. This stands for ‘Total Bad Ass’ because that’s exactly
what you are if can pull this one off.

Race Day:  July 24, 2020

Once again we are partnering with Willies Distillery for Southwest Montana’s coolest 5K. This race coincides with Willies Distillery generous pig roast. It offers food, fun, and music for free. Drinks of all kinds are available. It’s a family event and a great way to kick off the summer (along with running the 5K of course). Come to Ennis in Southwest Montana and start the summer with a bang!


Race Day: July 25, 2020

For the Inaugural Madison Ultras, there are three race categories for runners.  There is individual Madison Ultra Up and Madison Ultra Down. Then, there is a team category which is two runners – one running the Up route and one running the Down route.  The combined times of the two runners competes for the Team Championship.


Race Day: July 26, 2020

The 3rd Annual Tour de Gravelly is the newest and coolest gravel road cycling race in Montana.


Partners for 2020
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