18 Years and Still Running Strong

Event Registration

Sign up here! These links will take you to the official sign up pages on Events.com

14th Annual Madison Triathlon

14th Annual Madison Duathlon

6th Annual Madison Ultra 50

18th Annual Madison Marathon

9th Annual Tour de Gravelly

The mission of the Greater Yellowstone Adventure Series is to invite athletes, explorers, and adventurers from around the world to the high mountains of Southwest Montana and provide them with the penultimate race experience.

Twenty years from now you will be more disappointed by the things you didn't do than by the ones you did. So throw off the bowlines, sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.

Mark Twain

These Ain’t No Pansy Ass City Races

Greater Yellowstone Adventure Series LLC 411 South Third Street - PO Box 1173 Ennis, MT 59729 Race Director Contact: Sam Korsmoe - sam@yespi.net

Full

Half

It’s Time To Go

Race Director finally running his own race

Big Sky Signup

Madison Signup

Duathlon Sign Up

Full

The First Two Miles

Ouch!

Half

Full

Half

It’s All About Public Land

Please watch

July 20, 2025

Entry fees are not refundable, but bibs can be transferred free of charge.

Click on the photos above to download the race packets with race dates, logistics, route maps, lodging info, and other details for each of the races.