Races in the United States

The deepest race calendar in the index, anchored by Boston, Chicago, and New York on the road and Western States, Leadville, and Hardrock on the trail. IRONMAN runs a thick North American schedule alongside HYROX, Spartan, and an enormous gravel cycling scene led by Unbound. Peak season is March through November depending on region — Florida and California races run through winter. Expect strong fields, generous prize purses at the top end, and registration timelines (especially for Boston, Western States, and the New York Marathon) measured in months or years.