Ultra Running Hub Leadville, CO, Colorado, United States · Saturday, August 21, 2027
100 mi
Leadville Trail 100
287 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. Generous. Walkable throughout for most of the field. Tighter than 78% of 100 mi races. Measured against 46 races of the same distance. Cut-off calculator →
Field size ~390 Large. Rarely out of sight of another runner.
DUV results for the 2026 edition (100mi) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, August
Daytime high 19°C
Night low 4°C
Rainfall Mostly dry
Daylight 13 h 32 m of light
Regional 2001-2020 average for August — NASA POWER, grid elevation 3234 m. Not a forecast.
The Aid Station
Course-specific beta from the community
This is a rolling course. Expect fast, runnable sections where rhythm is key.
With mountain terrain, choose a shoe with aggressive lugs (5mm+) for optimal performance.
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 Shoes29 m of climb per kilometre — grip and rock protection before cushioning.
- Race NutritionPast 161 km the palate quits before the legs do — carry more than one flavour.
- Hydration VestsPole attachment and chest-strap stability on steep ground.
- Trekking Poles4,722 m of ascent to walk up.
- HeadlampsA 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
Course Notes
Surface: trails & dirt roads.
Similar races
Other 100 mi mountain ultras, closest in distance first.