Leadville Trail Marathon and Heavy Half 2026
About This Event
The Leadville Trail Marathon and Heavy Half put you through arguably the nation’s toughest and highest-altitude marathon experience. The route cuts through historic mining district trails to reach the highest point of any Leadville Race Series event: Mosquito Pass at 13,185 feet. You’ll face some of the thinnest air and most demanding terrain in endurance racing.
The marathon covers 26.2 miles with over 6,000 feet of elevation gain, while the Heavy Half spans 13-15 miles with more than 3,400 feet of climbing. Both races start and finish in downtown Leadville, taking runners through a mix of single-track trails, steep ascents, technical descents, rocky paths, dense forests, and alpine meadows. The courses share significant portions, so half marathoners experience the same breathtaking and punishing terrain as marathoners, just over a shorter distance.
Mid-summer timing brings generally pleasant weather, though the high altitude creates rapid weather shifts that demand preparation. Aid stations are strategically positioned throughout the course for hydration, nutrition, and medical support, with cutoff times enforced to ensure safety.
The atmosphere strikes a balance between serious challenge and supportive community. Spectators and volunteers create an encouraging environment along the course, understanding that simply finishing either distance represents a significant achievement in mental and physical endurance.
As part of the Leadville Qualifying Series, this event offers up to 25 spots for the legendary Leadville Trail 100 Run. Twenty slots go to top age-group finishers, while five are randomly drawn from all finishers who meet the cutoff requirements.
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