Ultra Running Hub Leadville, CO, Colorado, United States · Saturday, August 21, 2027
100 mi
Leadville Trail 100
323 days away
161 km Distance
4,722 m Climbing
10.0 Grit · Elite / extreme
What the course asks
Climbing rate 29 m / km
Rolling. Moderate undulations. Requires consistent effort across varying grades.
Time limit 30 hours
11:11 min/km average. Firm. Room to walk the climbs and stop at aid. About average for a 100 mi. Measured against 41 races of the same distance. Cut-off calculator →
Typical conditions, August
Daylight 13 h 32 m of light
Course notes
- terrain This is a rolling course. Expect fast, runnable sections where rhythm is key.
- gear With mountain terrain, choose a shoe with aggressive lugs (5mm+) for optimal performance.
- nutrition For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.
Gear for this race
Chosen for 161 km of mountain with 4,722 m of ascent.
- Trail Running Shoes 29 m of climb per kilometre — grip and rock protection before cushioning.
- Race Nutrition Past 161 km the palate quits before the legs do — carry more than one flavour.
- Hydration Vests Pole attachment and chest-strap stability on steep ground.
- Trekking Poles 4,722 m of ascent to walk up.
- Headlamps A 30 h limit puts you out there after dark.
About
The Race Across the Sky, an out-and-back through the Colorado Rockies at extreme altitude.
Highlights
- Minimum 3000m elevation
- Hope Pass (3840m) twice
- Race Across the Sky