The High Lonesome 100 is a brutally demanding 100-mile ultramarathon through Colorado's Sawatch Range, featuring 23,500 feet of climbing and five alpine passes above 13,000 feet.
High Lonesome 100 takes place on July 17, 2026 in Nathrop, CO.
High Lonesome 100 is 100 miles with 23,240 ft of elevation gain.
Yes — entry to High Lonesome 100 is decided by lottery.
Yes, crew is allowed at High Lonesome 100. Sign in to Trailrace to see crew access for each aid station.
Yes, pacers are allowed at High Lonesome 100.
Yes, High Lonesome 100 allows drop bags.
High Lonesome 100 has 14 aid stations along the course.
The overall cutoff for High Lonesome 100 is 37h. Per-aid-station cutoffs are available to signed-in Trailrace members.
Other trail races within 46 miles
The High Lonesome 100 is a high flying endurance race in the Sawatch Range of the Colorado Rocky Mountains. With 23,500' of vertical gain, reaching an elevation of 13,150', it's a hell of a course. The race runs in a loop through some of the most beautiful singletrack in the state, and takes runners on the National Continental Divide and Colorado Trails, through two ghost towns, over five alpine passes, through remote basins, over soaring ridges, all in 37 hours. It's also run and staffed by experienced and quality individuals, so you'll get to be a part of a wonderful community. If you're looking for a true mountain race, created in the spirit of the classic 100 milers, then look no further.
Experienced ultrarunners
Nathrop, CO, United StatesJuly 17, 2026
Separate men's and women's lotteries with equal pool sizes. Tickets accumulate each year, and can be augmented with volunteer hours and extra tail work.
Must complete a 50 Mile or longer (excluding UTMB events) within the qualification window
Qualifying window: January 01, 2023 – December 01, 2025
Finish a 50M or 100K trail race within the previous calendar year.
Finish a 100+ mile trail race within the previous 2 calendar years.
Finish the previous year's Sawatch 50/50
Reach at least Hancock Aid during the previous year's High Lonesome 100 under cutoff
No UTMB-owned races
Complete 8 hours of physical trail work with a recognized outdoor organization, or pay the $150 opt-out fee
Qualifying period: January 01, 2026 – June 30, 2026
Submission deadline: June 30, 2026
Challenging terrain with rocks, roots, and steep grades
| Location | Mile | Elevation |
|---|---|---|
Start Start | 0.0 | 8,547 ft |
Raspberry Gulch 1 Aid Station | 7.3 | 8,900 ft |
Skyline Comms Station Checkpoint | 14.7 | 13,094 ft |
Antero Aid Station | 16.9 | 11,713 ft |
Baldwin Comms Station Checkpoint | 21.1 | 9,400 ft |
St. Elmo 1 Aid Station | 25.1 | 10,115 ft |
Cottonwood Aid Station | 31.3 | 10,249 ft |
St. Elmo 2 Aid Station | 37.5 | 10,115 ft |
Tin Cup Aid Aid Station | 41.2 | 11,073 ft |
Hancock Aid Station | 49.3 | 11,043 ft |
Lost Wonder Hut Aid Station | 55.7 | 10,915 ft |
Purgatory Aid Aid Station | 64.9 | 11,804 ft |
Monarch Pass Aid Station | 67.7 | 11,309 ft |
Fooses Aid Station | 74.7 | 8,960 ft |
Shavano Aid Station | 81.2 | 9,193 ft |
Blanks Aid Station | 83.1 | 9,751 ft |
Raspberry Gulch 2 Aid Station | 92.7 | 8,900 ft |
Finish Finish | 100.0 | 8,547 ft |
Sign in to see cutoffs, crew access, drop bags, and services for every aid station.
Strongly suggest dogs do not attend race.
Rules for dogs:
No dogs at Cottonwood Aid
No dogs in any aid station or within 100ft, including finish line
Dogs must be leashed at all times
No unattended dogs, including in vehicles
Cleanup after your dog
Camping for tents, vehicles, and RVs available at the start/finish by reservation
Expect volatile weather in the Rocky Mountains. It can be very hot during the day, and very cold at night.
No recommended gear specified
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