Hardrock 100 Endurance Run
The Hardrock Hundred Mile Endurance Run is an ultramarathon of 100.5 miles in length, plus 33,050 feet of climb and 33,050 feet of descent for a total elevation change of 66,100 feet, at an average elevation of over 11,000 feet. The run is held on a loop course on 4WD roads, dirt trails, and cross country in Southern Colorado's San Juan Range, USA
Run Training Resources
Training for a half or full marathon?
Want to run faster, longer, and stay injury free?
Our friends at RunDoyen have have a proven track record of helping runners of all levels hit their goals with their roster of amazing running coaches, and effective training plans.
Get Matched with the Right Run Coach
Training with a run coach is one of the best ways to become a faster runner.
With coach matching you answer a few questions, then get matched with the best coach based on your individual goals and preferences. It’s 100% free to try!
Getting matched is 100% FREE to try, and there's no obligation to work with the coach. Click the button below to try it out.
Self-Serve Training SolutionDoyen Dashers is a personalized self-serve training solution, designed by the world's top coaches, built for runners of all levels built for runners of all levels.
Right now you can get full access with a 7 day free trial.
Dashers members get access to:
📅 Personalized Training Plans
📺 Full Training Video Library
📱 Online Training Log
💬 Unlimited Chat with Coaches
FREE Marathon Training GuideAuthored by RunDoyen’s world-class coaches, this guide covers every topic about training for the Marathon.
For a limited time, the marathon training guide is 100% free!
Find your running pace and splits, and learn if you can outrun dangerous animals with the RunGuides run pace calculator.