Mamba 100

Mamba 100 - November 6-7, 2026

The Mamba 100 is where endurance athletes come to test their limits on the cleanest, fastest dirt trails in the Southeast. This Western States Qualifier draws runners from across the country to tackle the legendary Wolf River singletrack, chase new PRs, and earn all-new 2026 buckles and medals, including the coveted Sub-20 and Sub-24 hour 100-mile buckles. With world-class photographers capturing every moment, seamless course marking, unmatched community support, and a race weekend that feels more like a celebration than a competition, the Mamba 100 is the event you’ll talk about all year.

Registration opens Black Friday at Noon — and for 12 hours only, you’ll lock in the lowest price of the year. Claim your spot and experience one of the Southeast’s most exciting ultras.

Western States Qualifier Race

Mamba 100 Miler is officially a Western States Qualifying Race. To earn your WSER qualifier, runners must complete the full 100 miles within the 34-hour cutoff.

Packet Pickup

Packet Pickup for the Mamba 100 will be held Thursday, November 5th at the Start/Finish line located at the Wolf River Refuge Trailhead on S. Walnut Bend Dr., Memphis, TN 38120, from 2:00 pm to 7:00 pm (CT). During this time, runners may also set up their 10x10 canopy tents for personal aid stations and/or crew use.

Dates and Times

• 100 Mile - Friday, November 6, 7:00AM
• 100k - Friday, November 6, 7:00PM
• 50k - Saturday, November 7, 7:00AM
• 25k - Saturday, November 7, 9:00AM

Course Description

The Mamba course is centered around a 14-mile loop of flat, fast, and smooth single-track with just a few small hills. Every race starts with a short “lead-in” section before runners enter the main loop.

Race Distances & Loop Breakdown

• 100 Miler - 7 loops + 2-mile start section / Total ≈ 100 miles
• 100K - 4 loops + 6-mile start section / Total ≈ 62 miles
• 50K - 2 loops + 3-mile start section / Total ≈ 31 miles
• 25K - 1 loop + 1.5-mile start section / Total ≈ 15.5 miles

Aid Stations

This race features two fully staffed aid stations: -Start/Finish – Wolf River Refuge Trailhead -Walnut Grove Bridge – Runners will pass this aid station twice per 14.3-mile loop. Aid stations will be stocked with water, electrolyte drink, soda, and standard ultra fare. Drop bags are permitted at the Start/Finish Aid Station only.

Awards, Medals, and Buckles

• Top 3 Male & Female in every race distance receive awards.
• 100 Mile: – Sub-20 Hour buckle – Sub-24 Hour buckle – All 100-mile finishers earn a custom Mamba buckle
• 100K: All finishers earn a 100K buckle
• 50K & 25K: All finishers earn finisher medals

Locations

The Mamba 100 is held at the Wolf River Refuge Trailhead on S. Walnut Bend Rd., Memphis, TN 38120.

Race Rules

Mamba Trail Runners — Race Rules. Every runner is responsible for knowing and following all rules. General Race Rules include no dropping down in distance, no muling, crew access only at Start/Finish, trekking poles allowed, pacers must run the entire loop, no littering, no course cutting, race must be completed on foot only, headphones allowed but removed at aid stations, be respectful, and no cheating.

Age Requirements

• 100 Miler: 18+
• 100K: 18+
• 50K: 16+ (Parent/Guardian must sign waiver)
• 25K: 13+ (Parent/Guardian must sign waiver)

Sponsors

Sponsorship opportunities are available. Contact [email protected].

Pacers

Pacers are permitted for the 100 miler and 100k distances only. Rules include one pacer at a time per runner, pick-up location at Start/Finish Aid Station, and no muling.

Drop Bags

Drop bags are only permitted at the Start/Finish line area. A dedicated “Runners Tent” will be set up for gear.

Photographers

Official photographers Jenny Thorson and Misty Herron will be present. All photos are free for runners to download.

Accommodations

Numerous hotels, restaurants, and stores are located along Germantown Parkway near the Wolf River Refuge Trailhead. RV camping is available at Agricenter International.

Trail Sisters Approved Race

Mamba 100 is a Trail Sisters Approved race, ensuring equal opportunities and a supportive environment for women.

Crew / Personal Aid Station rules

Rules include no dog pens, no open camp-fire flames, solo stoves allowed, no loud music, 10x10 canopy tents, no overnight camping on Thursday, and clean up all trash.

For More Information

Join the Facebook Group: Mamba Trail Runners, Instagram: Mamba Trail Runners, Youtube: Mamba Trail Runners.

Start Times

• 100 Miler: Fri 7:00 AM
• 100K: Fri 7:00 PM
• 50K: Sat 7:00 AM
• 25K: Sat 9:00 AM