Mamba 100 - Memphis, TN

NOV
6-7
2026
A multi-distance trail ultramarathon in Memphis centered on a fast 14-mile loop, serving as a Western States qualifier with full aid stations and equal podiums.
6-7 Nov 2026
100 miles 100 kilometers 50 kilometers 25 kilometers

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Mamba 100 - Memphis, TN

The Mamba 100 is a multi-distance trail event held in Memphis, Tennessee and organized by Mamba Trail Runners. The event includes the following race distances:

  • 100 Miler
  • 100K
  • 50K
  • 25K

The course is centered on a 14-mile loop of mostly flat, fast, and smooth single-track with a short lead-in section before the loop. Distances are made by combining the loop with an additional start segment: the 100 Miler is seven loops plus a 2-mile start segment (approximately 100 miles); the 100K is four loops plus a 6-mile start segment (approximately 62 miles); the 50K is two loops plus a 3-mile start segment (approximately 31 miles); the 25K is one loop plus a 1.5-mile start segment (approximately 15.5 miles).

There are two primary aid stations on the loop (Bridge and Start/Finish), providing support roughly every 4–5 miles. Hydration includes Tailwind, water, and electrolyte drinks; food ranges from snacks and sandwiches to hot meals overnight. Menstrual products are available at aid stations.

The race is a Western States qualifying event. Pacers are permitted for the 100 Miler and 100K with specific entry and pacing rules. Key race rules include no muling, no dropping down in distance, crew access restricted to the Start/Finish area, and completion on foot only. Age minimums apply to each distance. The event is Trail Sisters approved and includes policies for pregnancy and postpartum deferrals and equal podium recognition for women and men. Visit the organization's website for the most recent information.

100 mi
100 Miler
100 km
100k
50 km
50k
25 km
25k

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