Mamba 100 - Memphis, TN

NOV
7-8
2025
Mamba 100 hits the Wolf River trails near Memphis on November 7 and 8 2025 with 100 mile, 100k, 50k and 25k options. Fast looped single track, lively aid stations and a crew friendly start is ideal for chasing a big finish or having fun.
7-8 Nov 2025
100 miles 100 kilometers 50 kilometers 25 kilometers

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Event overview

The Mamba 100 takes place November 7-8, 2025 at the Wolf River Refuge Trailhead on S. Walnut Bend Drive near Memphis, TN. Distances offered:

  • 100 Miler
  • 100K
  • 50K
  • 25K Registration closes Monday, November 3, 2025 at 11:59 PM CT.

Course and logistics

The course is a 14.35-mile loop along the Wolf River, made up mostly of single-track trails with low elevation gain. Distances require multiple loops: the 100 miler is seven loops, the 100k is four loops plus a shorter starter loop, the 50k is two loops, and the 25k is one loop. There are two staffed aid stations: Start/Finish at the trailhead and Walnut Grove Bridge, which is passed twice each loop. Drop bags are permitted only at the Start/Finish aid station. Packet pickup takes place at the Start/Finish location; during pickup runners may set up 10x10 canopy tents for crew use.

Rules, pacers and awards

The 100 miler is a Western States qualifying race. Pacers are permitted for the 100 miler and 100k only; no pacers for the 50k or 25k. One pacer at a time is allowed and pacers must sign a release and wear a pacer bib. Pacers may not carry gear for their runner outside fully manned aid stations. Top three male and top three female finishers in each distance receive an award plus a buckle or medal. The race is Trail Sisters approved. 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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