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Join Negative Split for a Fall Trail Marathon, Half, and 10K! This trail is one of the most iconic trails in the country crossing through both Montana and Idaho. The trail has long been designated for bike riders only, but will now offer a special single day running experience for this race! Run over scenic trestles, past waterfalls, and through some of the longest railroad tunnels open to foot traffic (1.8 miles long). This will truly be a running experience of a lifetime!
Details about the course can be found in the course maps section.
Registration opens on March 15, 2025.
No day of race registration is allowed. Shirts and Medals are only guaranteed for participants registering more than 10 days before the race. Pricing for the Marathon is as follows:
03/15/25 - 06/30/25: $95
07/01/25 - 07/31/25: $115
08/01/25 - 08/31/25: $125
09/01/25 - 09/27/25: $135
Packet pickup details will be provided closer to the event date.
Participants should bring their registration confirmation and any necessary gear for the race.
Race day is September 27, 2025.
Awards will be given to top finishers in each category.
Shuttle bus access to and from parking areas will be provided as needed.
For questions, participants can contact the race director through the registration page.
Details about the cancellation policy can be found on the race website.
