Leadville Trail 100
Race Day Weather
Cool start, warming finish
Runners will face a cool start at the high elevation with temperatures around 46°F, warming to 67°F at the finish. The wind will be light, but runners should prepare for headwinds from miles 1 to 12 and again from 23 to 45. Hydration will be crucial as the average humidity is 52%, and a gradual increase in temperature means adjusting pacing to avoid overheating.
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
