The Mamba 100 returns to Memphis, Tennessee on November 6th, bringing together endurance athletes from across the country for a challenging yet rewarding ultra-distance race through some of the best single-track trails in the Southeast. The event takes place primarily at Wolf River Refuge Trailhead along South Walnut Bend Drive and spans over two days with various distance options catering to different levels of experience. Race morning sees runners assembling early, often under mild autumn conditions that typically hover around 13 degrees Celsius on average but can range from a chilly minimum of about nine degrees up to seventeen. The atmosphere is one of camaraderie among competitors who share an appreciation for the natural beauty and technical challenge presented by the Wolf River trails. Participants prepare their gear at packet pickup, which occurs on Thursday evening ahead of race day. The Mamba 100 has been a staple in the endurance racing calendar since its inception several years ago and is renowned as one of the premier ultra-distance events in the region. As an official Western States Qualifier Race, it attracts runners aiming to earn their place at the prestigious Western States Endurance Run by completing either the full Mamba 100 miles or the 100K distance within specified time limits. The course itself winds through a series of flat and fast single-track loops that are known for being clean and smooth underfoot, offering runners an opportunity to push their pace while navigating minimal elevation changes. The route features well-marked trailheads with clear signage directing participants around each lap safely back towards the start/finish area where aid stations provide essential supplies throughout the day. Weather conditions during November in Memphis tend toward cool temperatures averaging 13 degrees Celsius and a moderate chance of light precipitation, typically falling below five millimeters. Humidity levels hover at an average of seventy-two percent with wind speeds generally steady around eleven kilometers per hour, making for comfortable running conditions barring any unexpected changes in weather patterns.
100 Miler 160.9K • Start: 07:00:00 • Fee: $330.00
100K 100K • Start: 19:00:00 • Fee: $215.00
50K 50K • Start: 07:00:00 • Fee: $115.00
25K 25K • Start: 09:00:00 • Fee: $100.00
The Mamba 100 offers the full ultra experience with a grueling 160.9K race that challenges even seasoned athletes to push their limits over seven loops plus an initial two-mile section. For those looking at slightly shorter yet still substantial distances, there is also a 100K option covering four laps and a six-mile start segment for runners aiming to qualify for Western States within the 34-hour cutoff period. The event further includes a fifty-kilometer race on Saturday morning starting from the trailhead along South Walnut Bend Drive as well as a twenty-five kilometer run later that same day. The Mamba 100 registration process begins promptly at noon Black Friday via https://ultrasignup.com/register.aspx?did=132639 with early bird pricing available for those who act quickly. Fees start at $100 for the shorter twenty-five kilometer race and rise to a maximum of three hundred thirty dollars for full participants in the 160.9K event. Runners must complete their payment by specific deadlines set forth on the website. Packet pickup is mandatory and occurs before race day itself, from two until seven o'clock PM on Thursday at the Wolf River Refuge Trailhead start line located off South Walnut Bend Drive. Here runners can also establish personal aid stations or crew areas within designated spaces provided for each competitor. Be sure to follow guidelines regarding overnight food storage due to wildlife activity in the area. Start times vary based upon selected distance, with the main 100-mile event kicking off early Friday morning at seven o'clock AM sharp from South Walnut Bend Drive near Wolf River Refuge Trailhead. The race requires participants aged eighteen years or older and encourages all competitors to familiarize themselves thoroughly with course maps before setting out on their journey. The Mamba 100 in Memphis, Tennessee, is an event that highlights the endurance spirit of runners through challenging yet scenic trails. With its rich history and unique opportunities for qualification into other major races like Western States Endurance Run, this ultra-distance race draws athletes from around the country seeking a memorable running experience on November 6th-7th.
Races Offered
100 Miler
Nov 06, 2026
straighten
Distance —
160.9K
terrain
Type —
Running
timer
07:00
sell
$330.00
100K
Nov 06, 2026
straighten
Distance —
100K
terrain
Type —
Running
timer
19:00
sell
$215.00
50K
Nov 07, 2026
straighten
Distance —
50K
terrain
Type —
Running
timer
07:00
sell
$115.00
25K
Nov 07, 2026
straighten
Distance —
25K
terrain
Type —
Running
timer
09:00
sell
$100.00
Weather History
These values represent the 3-year monthly averages for November in Memphis.
thermostatTemperature
8.9° / 17.7°
wb_sunnyFeels like
6.0° / 15.6°
light_mode
Avg sunshine hours
7h 38m
water_drop
Avg rainfall
4.7 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
11.3 km/h (Light breeze)
opacity
Sweat loss rate
Low
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Low (2.0)
humidity_mid
Humidity
71.9%
wb_twilight
Sunrise
07:35
nightlight
Sunset
17:54
About Memphis
Learn more about the host city, Memphis.
Memphis is the second largest city in the state of Tennessee, after Nashville. The state rests in the southeastern portion of the United States. Memphis, with a population of more than 651,000 (2019), is also the county seat for Shelby County. The city's claims to fame include Graceland, the mansion Elvis Presley lived in during his later years. Perhaps more importantly, Memphis is considered by many to be the home of blues music.
