Niwot’s Challenge is a very difficult, grass-roots, ultramarathon in Colorado’s Front 11147089_796942100402340_1305977973634935207_nRange. It is modeled after the arduous Barkley Marathons in Tennessee and the historic More and More Difficult 50K in New Hampshire. Much of the information for this event is kept secret until event week. This is done for a variety of reasons pertaining to the safety of the events participants and for the preservation of the event. If you want to know more.. you’ll just have to sign up.

April 28, 2018

Can’t tell ya.. unless you sign up.
We’ll just tell ya it’ll be unforgiving terrain in the Front Range West of Denver.


Runners will travel on dirt roads, trails, and via bushwhack/off-trail. Successful completion of the course will be achieved when a runner has travelled the course, identically to how it’s been laid out, and retrieves a page from each of the books hidden on the course.

Distance: ~45 Miles
Elevation: +19,000′ / -19,000′
Time Limit: 30 Hours
Aid: Very Limited – Runners must carry all necessary gear for entirety of the event.


No more than 30 runners will be selected to run in this event (Strict)

Entry Fee: Donation Suggested paid on race day

If you would like to run in Niwot’s Challenge, follow these directions carefully…

  • Applications will be accepted starting at Midnight on Monday, January 15th thru Noon on Wednesday, January 17th. (Extensions may be given closer to run day for stragglers).
  • Applicant’s must send an e-mail to with the following information
    • Your Name
    • Your Age
    • Town/State
    • Best and Worst 50 Mile Time
    • If no previous 50 Miler Completed, you must submit a short essay stating why you should be admitted to run
    • The total number of ultras you’ve completed
    • Your Spirit Animal/Totem Animal

Applicants will be selected on Wednesday, January 18th and notified ASAP. If more than 30 applicants have applied, a wait list will be started.


All runners will be known on race weekend by their Spirit/Totem Animal. Only those who finish the Niwot’s Challenge will be given a suitable trail/tribe name differentiating them from all other comers. Those who finish the challenge in both directions, will be ordained as a leader of the Nitwit Tribe

Information pertaining to the challenge will be issued, electronically, to runners on Sunday, April 23rd.
This information includes a course map, aid station location, aid and crew access point(s), additional rules, and start time of the event. This will provide runners with ample time to assemble their course maps and other needs for the event.


WARNING: This is NOT a run for beginners or whiners. This is an arduous event which includes a large number of off-trail miles. Participants are fully expected to be able to navigate using a map and/or compass; or by following another registered participant who can. All participants must fully understand that aid is limited, they are for the most part on their own, and they are expected to make S.M.A.R.T. decisions based on their individual limitations. No GPS is allowed on the course. Phones are permitted for emergency use ONLY.