From the Organizer
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 and reaching an elevation of 13,100', it's a hell of a course. The race runs in a loop through some of the most beautiful single track in the state, and takes runners on the Continental Divide and Colorado Trail, through 2 ghost towns, over 5 alpine passes, through remote basins, and over soaring ridges. 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.
Stats
- Entry fee: $465
- Start/Finish Location: County Road 321, Mount Princeton, Colorado (coordinates: 38.740282, -106.161237)
- Distance: 101 miles
- Average Elevation: 10,600'
- High Point: 13,100'
- Low Point: 8,150'
- Total Elevation Gain: 23,500'
- Cut off: 37 hours
- Course type: 66% single track, 21% mining roads, 10% gravel roads, and 3% paved roads
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
84°
Typical Low
50°
Chance of Rain
40%
Based on US Climate Normals data from Buena Vista 2s, 8 mi from the venue.
Host City
About Nathrop, CO
Elevation
8,048 ft
Nearest Airport
GUC
Gunnison Crested Butte Regional Airport · 46 mi
Major Hub
COS
City of Colorado Springs Municipal Airport · 77 mi
Time Zone
Mountain Time
From Endurance Grid
Line up lodging and travel early to lock in your race weekend.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at High Lonesome 100, put it on the calendar, and turn “someday” into a start date.
Coming Up
More Running races near Nathrop, CO
Independence Day Freedom 5K
5K
9 miles away
Women's Specific High Trails Trail Running Retreat
9 miles away
TransRockies Run Charity Bibs
9 miles away
14er Challenge
9 miles away
From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
- What is the High Lonesome 100?
- High Lonesome 100 is a running race held in Nathrop, Colorado on July 17, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the High Lonesome 100?
- Friday, July 17, 2026 in Nathrop, Colorado at Co Rd 321, Nathrop, CO. Check the event page for exact start times and wave schedules.
- How do I register for the High Lonesome 100?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
High Lonesome 100
Jul 17, 2026