Speedgoat

It is run every year in Little Cottonwood Canyon (Utah, United States) in July and includes a marquee 50K race and typically one or more other distances/challenges.

[1] The 50k race features an elevation ascent and descent of roughly 11,000 feet.

Due to its high altitude, large vertical gain/loss, and technical terrain, the race is regarded as one of the toughest 50ks in the world.

[2] Prior to the 2021 edition, Meltzer sold the Speedgoat races to IRONMAN Group, which is owned by Advance Publications.

A stipulation of the sale was that Meltzer remain as race director through the 2024 edition.