Leadville is one of the four 100-milers in the United States that make up the "Western Slam", completing four western events: the Leadville 100, the Western States 100 in northern California, the Wasatch Front 100 in Utah, and the Angeles Crest 100 in southern California. Leadville is also a part of the Grand Slam of Ultrarunning (the Vermont 100, Western States 100, Leadville and the Wasatch Front 100, originally Old Dominion 100 instead of Vermont) and an optional part of the Rocky Mountain Slam (Hardrock 100 plus three of four other races in the Rocky Mountains: Leadville, the Bear 100, the Bighorn 100, or the Wasatch Front 100). Leadville is also one of the valid qualifying events for the Western States 100.