At a glance
- Date
- Dec 31, 2026 – Jan 1, 2027
- Location
- Memphis, Tennessee
- Distances
- 36 hr
- Aid stations
- 2, 1 with crew access
- Registration
- Closes Nov 2, 2026, via ultrasignup.com
Listed from UltraSignup. Checked Oct 19, 2026.
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2 aid stations are already loaded. Add cutoffs, pacing and the timeline your crew follows. Crew invites and race-day updates come with a Race Pass.
Build my planAbout this race
The Mamba 100 is a Western States Qualifying race held on the Wolf River singletrack in Memphis, TN, featuring a 14-mile flat, fast loop course. Distances include 100 Mile, 100K, 50K, and 25K, with the 100-mile race requiring completion within a 34-hour cutoff to earn a WSER qualifier.
Key dates
Registration closes
Nov 2, 2026
Race day
Dec 31, 2026
Pricing
100 Miler
Registration
$330
100K
Registration
$215
50K
Registration
$115
25K
Registration
$100
Email me updates about Moccasin Ultra Fest
Registration openings and major changes, like a new date or a cancellation.
Aid stations
2| Station | Distance | Crew | Drop bags | Cutoff | Supplies |
|---|---|---|---|---|---|
Bridge Aid Station Located at approximately miles 4.5 and 9.5 each loop on the 14-mile loop course. Crew access is not permitted here: crew may only access runners at the Start/Finish Aid Station. | -- | -- | TailwindwaterGatoradeCoca-Cola+15 | ||
Start/Finish Aid Station Located at mile 14 of each loop. Primary hub for crew, drop bags, personal aid station, and canopy tents. Lasagna is specifically served here during evening/overnight hours. | -- | -- | TailwindwaterGatoradeCoca-Cola+16 |
Entry transfers
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Race planning
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