Mamba 100 - Memphis, TN
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Mamba 100 - Memphis, TN
The Mamba 100 is a multi-distance trail running event held November 6 to 7, 2026 at the Wolf River Refuge Trailhead in Memphis, Tennessee. The races use a primary 14-mile loop of flat, smooth single-track with a short lead-in section for each distance. Two primary aid stations are positioned on the loop and provide support roughly every four to five miles.
Distances offered
- 100 Miler: 7 loops plus 2-mile start section, approximately 100 miles.
- 100K: 4 loops plus 6-mile start section, approximately 62 miles.
- 50K: 2 loops plus 3-mile start section, approximately 31 miles.
- 25K: 1 loop plus 1.5-mile start section, approximately 15.5 miles.
The 100 Miler is a Western States qualifying race with a 34-hour cutoff to earn qualifier status. All distances feature aid station food and hydration, with additional hot food during evening and overnight hours for longer distances. Menstrual products are stocked at aid stations.
Entries reached the event capacity of 500 and are sold out; a free waitlist is open and runners are offered spots as entries change. The event has no refunds; deferral credit is available on a sliding scale depending on how far in advance the request is made. Age minimums apply by distance and pacers are permitted only for the 100 Miler and 100K with specific pacing rules. Awards include top three male and female in each distance and distance-specific buckles or medals for finishers. Visit the organization's website for the most recent information.
