Night Crawler Endurance Challenge
Casper, United States • 14-15 Aug 2026
Event overview
The Night Crawler Endurance Challenge is an overnight time-based solo and relay trail event on Casper Mountain. The 2026 edition takes place Friday to Saturday, Aug 14-15, 2026, and is organized in partnership with WYRun and Fat Fish Racing. The event is run from the Nordic stadium start/lap/finish area near the Casper Mountain Trails Center (9301 Casper Mountain Rd.). The site includes access to the Trails Center parking lot and nearby Tower Hill campground.
Format, course and logistics
Distances and formats:
- 4-hour solo
- 12-hour solo
- 12-hour 4-person relay
The course is a rolling loop on forested single track and cross-country ski trails atop the 8,100-foot Casper Mountain. The route has minimal to moderate technical difficulty and is timed overnight. Runners change direction each lap: odd-numbered laps are clockwise and even-numbered laps are counterclockwise. Participants and crews may use the start/lap/finish area to stage and rest between laps; participants should check in and out at the start/finish after each lap and follow county park rules for camping and parking. Every participant receives a finisher award. Overall first-place awards are given for male and female solo winners in both the 4-hour and 12-hour events and for the winning 12-hour 4-person relay. A hot breakfast is provided to participants after the event. Visit the organization's website for the most recent information.