Montana has a Double Marathon! Here's your chance to earn four stars if you're a Marathon Maniac, do your first double marathon, or truly test yourself by doing two high altitude marathons back to back on a weekend in July. On Saturday, you'll run The Highest Road Marathon on Planet Earth. On Sunday, you'll run The Second Longest Downhill Road Marathon on Planet Earth. Try to find that combo anywhere else in the world. These two races are just plain cool.

The Greater Yellowstone Adventure Series is a six-race series in Southwest Montana.

Beginning at 12:00 AM on January 1, 2017, online signup for the Madison Trifecta and the Double Marathon is open. The Madison Trifecta is the combination of the 6th Annual Madison Duathlon (July 9), the 10th Annual Madison Marathon (July 22), and the 6th Annual Madison Triathlon (August 6) all within a four-week time span of the summer of 2017. The Double Marathon is the 10th Annual Madison Marathon (July 22) followed by the 3rd Annual Big Sky Marathon the very next day (July 23).

For all other races and race categories, online sign up will begin at 12:00 Noon (MST) on March 1, 2017.

The dates of the races are:

22nd Annual Madison River Run - June 3

6th Annual Madison Duathlon - July 9

10th Annual Madison Marathon - July 22

3rd Annual Big Sky Marathon - July 23

6th Annual Madison Triathlon - August 6

Proposed Cycling Race - Late August / Early September

There are no refunds allowed for any reason. However, we will allow you to transfer your entry to anyone either online or as arranged by phone or email.