Leadville 100 Weather Guide
Weather conditions at the Leadville 100 high-altitude ultramarathon.
The Leadville 100 at 10,000+ feet brings unique weather challenges.
Leadville Altitude Weather
The setting: Colorado mountains, starting at 10,200 feet, topping 12,600 feet.
What this means: Thin air + mountain weather = volatile conditions.
August in the Rockies
Typical pattern:
- Cool/cold nights
- Warming days
- Afternoon thunderstorms possible
- Temperature swings
Race Weather Progression
4am start: Cold. Wear layers.
Daytime climbs: Warming but altitude keeps it cooler than valleys.
Hope Pass (12,600ft): Cold, exposed, potential storms.
Night: Cold again, can be very cold.
Mandatory Gear Reasoning
Why Leadville requires:
- Jacket
- Headlamp
- Emergency supplies
Answer: Mountain weather changes rapidly.
Storm Awareness
Afternoon thunderstorms: Common at altitude.
Above treeline: Lightning danger.
Race adjusts: But you must be prepared.
Leadville's altitude creates unique weather challenges. Cold nights, afternoon storms, prepare for everything.
Find Your Perfect Run Window
Get personalized weather recommendations based on your preferences. Run Window learns what conditions you love and tells you when to run.
Download for iOS - Free