The Yellowstone Trail Marathon and Trail Races #1

The Yellowstone Trail Marathon and Trail Races takes place on July 10, 2027, in West Yellowstone, Montana. Every distance starts at 9:00 a.m.: the 50K (31.1 mi), the marathon (26.2 mi), the 25K (15.5 mi), the half marathon (13.1 mi) and the 10K (6.2 mi). No elevation gain is listed.

West Yellowstone sits at around 6,600 feet, high enough that a marathon here costs a lowland runner five to ten minutes over the same effort at sea level, and the 9:00 a.m. start means the long distances run through the warmest hours. Arrive at least two days early, drink steadily from the moment you land, and set your target from experience at altitude rather than from your last road race.