Prospective entrants are required to demonstrate adequate mountaineering experience either by having competed in the race previously, or running one of the following mountainous 100 miles ultramarathons in the previous 3 years: Wasatch, Eagle, the Bear, Angeles Crest, Cascade Crest 100, Plain 100, HURT, Mogollon Monster 100, or Bighorn; or else have demonstrated equivalent mountaineering experience.