Viper 300

Event details

The Viper 300 is a multi-distance trail event at Shelby Farms Park in Cordova, Tennessee, held March 9-14, 2026. Distances offered include:

• 300 Miler
• 200 Miler
• 100 Miler
• 53K
• 25K

Each distance has a set maximum time to finish: the 300 mile has a 137-hour limit, the 200 mile an 89-hour limit, the 100 mile a 41-hour limit, the 53K a 29-hour limit, and the 25K a 16-hour limit. Registration closes March 7, 2026 at 11:59 PM CT.

Course and logistics

The course is a roughly 33.4-mile loop that mixes paved paths and single-track trails through lakes and wooded areas inside Shelby Farms Park. Wildlife on the course can include deer and buffalo. There are two fully manned aid stations at Hyde Lake Pavilion (start/finish area) and Tour de Wolf Pavilion; runners encounter the Tour de Wolf aid station twice per loop. Aid stations offer typical ultra foods, water, and electrolyte drinks; covered sleeping areas and drop bag access are available at both manned stations. At least one additional unmanned aid station is on course. Live tracking is provided for the 300 and 200 mile races.

Crew access is limited to the two manned aid stations. Pacers are permitted for the 300, 200 and 100 mile distances (one pacer at a time) and may begin pacing only after specified loop counts; no pacers are allowed for the 53K or 25K. Race rules prohibit dropping down during the race, muling, receiving crew assistance outside manned aid stations, cutting the course, and other forms of outside assistance. Visit the organization's website for the most recent information.