Rocky Mountain Slam
Logan, United States • 25 Sep 2026
Rocky Mountain Slam (Logan, UT)
Rocky Mountain Slam is a series of mountain ultramarathons centered on The Bear 100 held in Logan, Utah. The series requires runners to complete at least four races, with The Bear 100 designated as the mandatory event. Most included races are 100 mile events.
The Rocky Mountain Slam evolved from an earlier series created in the early 2000s. Bighorn 100 was added in 2003. The series saw changes over time including the substitution of Ouray 100 for Hardrock in 2019 and a pause in 2020. A revised format, called Rocky Mountain Slam V2.0, was announced in 2022. Scout Mountain 100 was added in 2024, and High Lonesome 100 and Crazy Mountain 100 were added in 2026.
Under the V2.0 format, runners may choose from a list of optional races while completing at least four total events; The Bear 100 is the only required race. The optional races include Scout Mountain 100, Bighorn 100, Hardrock 100, Leadville 100, Wasatch Front 100, Ouray 100, Wyoming Range 100, High Lonesome 100, and Crazy Mountain 100. The series does not keep a formal overall time record, though an informal summation of a runner’s fastest four runs including The Bear is noted. Registration for the series is required and closes July 15 for the 2026 edition. Visit the organization's website for the most recent information.