JULY 28-29, 2017


The High Lonesome 100 is not an easy endurance running course. It's high, remote, rugged, relentless, and steep. This race will test even experienced endurance runners who have run 100 mile races in Colorado. We have these qualification requirements because we believe that to have the best chances of succeeding, you need to have some experience with long distance or 100 mile trail races. In order to enter to run the High Lonesome 100, you must meet one of the following requirements:

  • Completed a 50 mile or longer trail ultra within the last two years
  • Finished a 100/200 miler ever
  • Completed an event of similar physical effort (Iron Man, Nolans 14, ect). Please email the RD for more info. 


Early Registration (Jan 15 - March 22)

$225 (click here for more info)

Regular (March 22- May 31)


Late (June 1 - July 23)


No refunds are allowed for Regular and Late signups, however runners may rollover their entry to the following year without penalty. The cut off for rollover is June 30th.

Due to the sensitive areas that the race runs through, the race is capped at 75 by the USFS. Sign up now, spots will go fast!

Service Requirements

We all love trails, and we want you to show that love by doing 8 hours of trail work as part of your registration. This work must be on trails, so volunteering at another race or pacing your friend unfortunately won't count. Your work should be done in conjunction with a recognized outdoor organization; a local open space department, a state parks department, trail foundations or something similar.   

Click the button below to print your trail work confirmation form.  Fill it out and have someone with the organization you volunteered for sign it with their work title. 

If you are simply logging to many miles to prep for this incredible 100 mile race in Colorado, or life is just too hectic to commit to volunteering, you can choose to pay an opt-out fee of $125. Those who chose to pay the opt-out fee should do so guilt free; High Lonesome 100 will donate 100% of the opt-out fees to Colorado Fourteeners Initiative, one of Colorado's leading nonprofits.

The trail work confirmation, or trail work opt out fee must be received no later than July 12, 2017.  There are several ways to get your service requirement confirmed by the Race Director:

  1. Scan (or take a clear picture of) your signed trail work form and email it to caleb.e@highlonesome100.com.
  2. Add the trail work opt-out fee to your shopping cart at the time of registration.
  3. Use PayPal or Venmo to send your trail work opt out fee.
  4.  Mail your trail work form or opt-out fee to PO Box 647, 619 12th Street Golden, Colorado 80401. Please make checks payable to RidgeDancer Limited.