In the United States ultra running on trails, the Grand Slam is the completion of four well-known 100-milers during one season: Old Dominion, Western States, Leadville, and Wasatch. You may substitute Old Dominion with Vermont’s 100 in some instances.
It is hard on the body, the planning, and the recovery to run all four events in one summer. The runners traverse various surfaces—rail trails, long mountains, desert canyons, and hilly loops—travelling well over 400 miles and gaining several thousand feet. The culture of the Grand Slam is one of hard work and camaraderie. There is no formal group to organize it, but completing the Grand Slam is respected within the ultrarunning community and typically requires meticulous training, pacing, and meal preparation.
