Leadville Trail 100
Race Day Weather
Cool start, warming finish
Runners will face a cool start at 46°F, warming to 67°F by the finish. Winds will be light overall, but headwinds will challenge runners from miles 1 to 12 and again at several points through the race. As temperatures rise, especially after mile 55, pacing adjustments may be necessary to avoid overheating. Hydration will be crucial, particularly as humidity hovers around 52%.
This course climbs 2,247 ft to its high point and back, so we look at it at 2 points, not just the start line. In a typical year, at 9:00/mi, you start at 46° and finish around 6:59 PM in 67°.
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Race Info
The Leadville Trail 100 Run (aka The Race Across The Sky or the LT100) is an ultramarathon held annually on rugged trails and dirt roads near Leadville, Colorado, through the heart of the Rocky Mountains. First run in 1983, the race course climbs and descends 15,600 feet (4,800 m), with elevations ranging from 9,200 to 12,620 feet (2,800–3,850 m). In most years, fewer than half the starters complete the race within the 30-hour time limit. Wikipedia
