Run Rabbit Run 100 takes place on Fri, Sep 18, 2026 in Steamboat Springs, United States. The main route is 163.3 km.
- Date
- Fri, Sep 18, 2026
- Start
- Steamboat Springs 🇺🇸
- Distance
- 163.3 km
- Climbing
- 6,215 m
- Level
- Open to all
Run Rabbit Run 100 is a challenging high-country ultramarathon around Steamboat Springs featuring separate Hare and Tortoise starts and a substantial prize purse.
Official event pageWhat this race demands
Run Rabbit Run 100 demands sustained endurance across 163.3 km of mountain terrain with 6215 meters of climbing. Athletes must manage high-altitude exertion and extreme cumulative vertical gain over a protracted duration.
Extreme climbing volume
Navigating 6215 meters of elevation gain across 163.3 km requires significant uphill strength, efficient pacing on ascents, and the muscular endurance to handle relentless descending.
Ultra-distance durability
Covering 163.3 km places severe stress on connective tissues and energy systems, demanding meticulous pacing and advanced fatigue resistance to sustain forward motion for an extended period.
High-altitude management
As a high-country ultramarathon in Steamboat Springs, the course exposes athletes to reduced oxygen availability, requiring careful management of aerobic output to prevent premature bonking.
Given the substantial duration of a 163.3 km mountain ultramarathon, athletes should target 60 to 90 grams of carbohydrates per hour from the early stages to sustain energy levels and prevent profound glycogen depletion.
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 Run Rabbit Run 100 is 4 weeks away. This is how a coach divides that time. The first phase starts now.
01Peak1 week · Aug 22, 2026 – Aug 28, 2026
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
02Taper2 weeks · Aug 29, 2026 – Sep 11, 2026
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
03Race week1 week · Sep 12, 2026 – Sep 18, 2026
Openers, rest and logistics. The work is done; the job now is arriving fresh.
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