$100
25K Registration
2
Aid Stations
20
Days Away
The Mamba 100 is a Western States Qualifying ultra 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 world-class photography, fully stocked aid stations, and custom buckles and medals.
Race Day
Sep 26, 2026
Registration Closes
Invalid Date
Registration opens, price changes, race updates: straight to your inbox.
Current Price
$100
25K Registration
Price Progression
| Station | Distance | Crew | Drop Bags | Cutoff | Supplies |
|---|---|---|---|---|---|
Bridge Aid Station Located approximately miles 4.5 and 9.5 each loop. Crew access not permitted — crew may only access runners at the Start/Finish Aid Station. | -- | -- | TailwindwaterGatoradeCoca-Cola+15 | ||
Start/Finish Aid Station Primary hub for crew, drop bags, personal aid station, and canopy tents. Located at mile 14 of each loop. Lasagna served here during evening/overnight hours. | -- | -- | TailwindwaterGatoradeCoca-Cola+16 |
Build your aid station plan, organize your crew, and dial in your nutrition strategy. Everything you need to finish strong.
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