Night Crawler 12 Hour Endurance Challenge

August 14th 2026
Casper, WY
12 Hours

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 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? https://nightcrawler12-hourec.weebly.com/

Upcoming Races

Aug 14 2026
12 Hours
Multiple Loop
3 Elevation Rating
Hilly, ~2500-7500 feet in 50 miles
3 Surface Rating
Some rocks, root, and/or ruts

Results

12 Hours

Date Finishers Top Result (F) Top Result (M)
08/22/25 18 48 56
08/23/24 17 46.1 51
08/25/23 14 40 56
08/26/22 26 51 52.5
08/27/21 17 46 54
08/28/20 18 32 57.5
08/23/19 11 40 52.5
08/24/18 10 44 51.3

Weekly Newsletter

A roundup of the week's content and most recent race results. Sent once a week on Thursday.

Recent Results

Lake Tye Challenge
Monroe, WA - 25 finishers
12 Hours | 6 Hours
Cinderella Trail - Spring
Oakland, CA - 28 finishers
50 KM
Infinitus
Ripton, VT - 36 finishers
100 Miles | 88 KM
Smith Rock Classic
Terrebonne, OR - 185 finishers
50 Miles | 50 KM
MCW The Tatum Classic
Middletown Township, NJ - 16 finishers
50 KM
The Midwest Ultra Track Classic
Warrensburg, MO - 19 finishers
24 Hours | 12 Hours | 6 Hours
The Full Mo
Sheridan, IN - 190 finishers
50 KM
Chesterfield Gorge Ultra
West Chesterfield, MA - 120 finishers
100 Miles | 100 KM | 50 Miles | 50 KM
Mohican Trail Run
Loudonville, OH - 251 finishers
100 Miles | 50 Miles
View All Results