High Lonesome 100 takes place on Fri, Jul 16, 2027 in Nathrop, United States. The main route is 160.9 km.
- Date
- Fri, Jul 16, 2027
- Start
- Nathrop 🇺🇸
- Distance
- 160.9 km
- Climbing
- 7,163 m
- Level
- Open to all
The High Lonesome 100 is a high-altitude mountain endurance race traversing singletrack in the Sawatch Range of the Colorado Rocky Mountains.
Official event pageWhat this race demands
The High Lonesome 100 demands relentless stamina and technical climbing ability to cover 160.9 kilometers with 7163 meters of elevation gain at high altitude.
Extreme Climbing Volume
Accumulating 7163 meters of vertical gain over a 160.9-kilometer ultra-distance requires sustained muscular endurance and efficient ascending mechanics in steep terrain.
High Altitude Resilience
Traversing the Sawatch Range in the Colorado Rocky Mountains exposes athletes to significant elevations, demanding strong cardiovascular capacity and effective pacing to manage oxygen debt.
Extended Durability
A continuous trail run of this magnitude requires robust musculoskeletal tolerance to withstand repetitive impact and fatigue management over many hours of movement.
Given the multi-hour duration of a 160.9-kilometer mountain race, athletes should consume 60 to 90 grams of carbohydrates per hour to sustain energy output.
Estimated finish times
Estimates by level, not promises. Your own number depends on your fitness on the day.
Your road to race day
Race day at High Lonesome 100 is 47 weeks away. This is how a coach divides that time. The first phase starts now.
01Base35 weeks · Aug 22, 2026 – Apr 23, 2027
Aerobic foundation: mostly steady endurance work that grows the aerobic engine and the durability the later phases stand on.
02Build6 weeks · Apr 24, 2027 – Jun 4, 2027
Progressive overload: training load climbs in waves, with harder weeks stacked on the base and planned recovery weeks that let the gains land.
03Peak3 weeks · Jun 5, 2027 – Jun 25, 2027
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
04Taper2 weeks · Jun 26, 2027 – Jul 9, 2027
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
05Race week1 week · Jul 10, 2027 – Jul 16, 2027
Openers, rest and logistics. The work is done; the job now is arriving fresh.
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