The Night Crawler 12-hour Endurance Challenge is a solo ultramarathon and team relay, run overnight under the light of the moon through the forested trails atop beautiful 8,100-foot Casper Mountain. Run as a solo ultrarunner, or get your fellow night crawling friends together for a 2 or 4-person relay team. The Night Crawler begins at 6:30 PM on Friday evening (Aug 24) continuing throughout the night and finishes at 6:30 AM on Saturday as the sun rises. Enjoy the camaraderie of our awesome trail running community and the scenery that our mountain gem has to offer. Are you up for the challenge?