Tennessee · 100 Miler · 100K · 50K
Mamba 100
Mamba 100 is a 100 Miler, 100K, 50K and 25K event held in Memphis, Tennessee. Its next confirmed date is Friday, November 6, 2026. About 84 runners take part across all distances.
- Race day
- November 6, 2026
- Location
- Memphis, TN
- Field size
- ~84 runners
Race details
- Date
- Friday, November 6, 2026
- Location
- Memphis, Tennessee
- Distances
- 100 Miler, 100K, 50K, 25K
- Field size
- About 84 runners
- Registration
- ultrasignup.com
- Official website
- mambatrailrunners.com
Registration, course & weather
- Registration status
- Open
- Entry fee
- Listed fee for the longest distance, $330 (from ultrasignup.com, checked September 28, 2026)
- Start time
- 7:00 AM CST
- Course profile — 100 Mile
- Loop course; Trail surface
- Course profile — 100K
- Loop course; Trail surface
- Course profile — 50K
- Loop course; Trail surface
- Course profile — 25K
- Loop course; Trail surface
- Typical race-day weather
- about 62°F at the start, 91% humidity, 10 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked September 28, 2026)
About the Mamba 100
Mamba 100 is a multi-distance trail ultra (100 Mile, 100K, 50K, 25K) at the Wolf River Refuge Trailhead in Memphis, TN, built around a flat, fast 14.35-mile singletrack loop. The 100-mile distance is a Western States 100 qualifier with a 34-hour cutoff.
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Mamba 100: common questions
- When is the Mamba 100?
- The next confirmed date is Friday, November 6, 2026.
- Where is the Mamba 100 held?
- In Memphis, Tennessee.
- What distances does the Mamba 100 offer?
- 100 Miler, 100K, 50K and 25K.
- How many people run the Mamba 100?
- About 84 runners across all of its distances. That figure is an estimate of the field size, not an entry cap.
- How do I register for the Mamba 100?
- Registration is handled by the organiser at ultrasignup.com. Entry fees, caps and deadlines are set there.
- Is registration open for the Mamba 100?
- Yes — registration is open. Listed fee for the longest distance, $330 (from ultrasignup.com, checked September 28, 2026).
- What time does the Mamba 100 start?
- 7:00 AM CST.
- What is race-day weather usually like at the Mamba 100?
- about 62°F at the start, 91% humidity, 10 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked September 28, 2026).
Plan this race in RaceRove
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