Distance
Terrain
Difficulty
Mamba 100 unfolds on the dirt trails of the Wolf River trail system in Memphis, Tennessee, across the weekend of 6 and 7 November 2026. Four distances are on offer, 100 miles, 100K, 50K and 25K, so a first trail outing and a full Western States qualifier share the same start area and the same woodland course. The weekend is built around crews, with family and friends able to settle in on site and follow their runners through the day and into the night. It is organised by Mamba Trail Runners, the Memphis club that staged the city's first 100 mile race.
Wolf River Trails, Memphis
Western States Qualifier
Crew, family and friends welcome
Dirt trail running through the weekend
Start / Finish
Wolf River Trails, Memphis, Tennessee
Wolf River Trails, Memphis, Tennessee
Terrain
Race Day
Other questions
Yes. The organiser lists the Mamba 100 as a Western States Qualifier, so a finish counts towards the Western States Endurance Run qualification system. Details of the exact qualifying standard are confirmed on the UltraSignup entry page.
Yes, and they are actively encouraged. The organiser describes the Mamba 100 as the perfect race for crew, family and friends to attend, which makes it a good weekend for a support team rather than a solo trip.
The races are run on the dirt trails of the Wolf River trail system in Memphis. Expect a woodland trail surface rather than road or pavement, with the usual roots, turns and soft ground you find on river corridor trails.
The club relies on volunteers across its race calendar for marshalling, registration and aid stations. Email [email protected] to put your name down, and the team will confirm roles and timings for the Mamba 100 weekend.
Entry fee not listed
Check the race's registration page for pricing.Memphis, USA
Friday, November 6, 2026
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