August 3-4, 2018 -  6:00am start


Regular (Nov 1, 2017 - Feb 4, 2018): $275

Late (Feb 5, 2018 - Aug 2, 2018): $310

Refund and Deferment policy:

There are no refunds for race entry or the trail work opt out fee, however we do offer several options to runners who wish to drop from the race. 

75% rollover to the following year is allowed up to 4 weeks in advance of the race.

50% rollover to the following year is allowedbetween 1-3 weeks in advance of the race.

25% rollover to the following year is allowed 2-7 days in advance of the race.

Runners wishing to defer to the following year must notify the RD via email within the specified time windows. Deferments are not refundable in the event that the following year event is canceled or the dates do not work for the runner. The value of the rollover is determined as the specified percent of the runners paid entry fee. For example, a runner who paid $275 and is deferring in the 50% window would receive a credit of $137.50 towards their registration for the following year.

The credit must be used within the first 4 weeks of registration opening.


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 in 2016/17

  • Finished a 100+ miler within the past 10 years

Trail Work Requirements

All runners must complete at least 8 hours of physical trail work. 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. 

Should you be be unable or unwilling to complete the 8 hours of trail work, you may chose to pay the $125 opt out fee. 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.

All trail work forms or Opt out fee payments must be received by July 23, 2018.  Please click on the button below to download the form. 

Runners may pay the opt out fee during the time of their registration or can send the funds via PayPal. No personal checks are accepted. 

Any runners who do not complete this requirement will be dropped from the race without possibility of deferment. 

Required Gear:

All runners must carry certain pieces of equipment. The equipment is checked at the start line from 5:00am-5:45am.

Required from the Start:

  • Whistle
  • Emergency space blanket
  • Minimum 2L water capacity (you don’t have to have it full, just have the capacity to carry 2L)
  • Emergency light source (must be at least 10 lumens, example)
  • Water resistant/waterproof jacket
  • Collapsible cup (bottles do not count, suggested option)
  • COSAR card (see subsection below)

Required from St. Elmo 2 to Finish:

  • Two light sources (primary source + emergency source)
  • Gloves
  • Buff/Beanie (both would be a good choice)
  • Extra layer (long sleeve T-shirt or greater. NO COTTON

Additionally recommended items:

  • Pants or leggings for alpine sections

COSAR Cards:

All runners (and pacers) must purchase a COSAR card. The card is $3 for one year, or $12 for 5 years. This card is not insurance, but will allow local SAR to be reimbursed for a portion of the costs in the event of a search. By Colorado law, individuals can be responsible for certain portions of  the costs of a search. By purchasing a card, you enable the local organization to be reimbursed by the state and fund their 100% volunteer forces.

 You will be required to show proof of your COSAR card at runner check-in. The purchase process only takes a few minutes. Please visit the link below to purchase a card.

You don’t need to carry it during the race, but you have to show it at packet pickup.

Please note, current and valid CO hunting and fishing licenses do count as a COSAR Card