Great Springs Trail Race - Natural Bridge Caverns
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Great Springs Trail Race - Natural Bridge Caverns
This event takes place at Natural Bridge Caverns near San Antonio, New Braunfels, and San Marcos on September 26, 2026. The program includes multiple distance races that begin with a short section inside the caverns and continue on surface trails that pass through wooded areas and rolling hills. A central race hub on the surface functions as the start and finish area for loops and provides aid and crew space.
Distances offered:
- 4 miles run
- 8 miles run and ruck
- 16 miles run
- Last Person Standing run and ruck
- Youth 1 mile
Last Person Standing uses a core loop of 4.1667 miles for runners and 2.47 miles for ruckers. Competitors must complete each loop within one hour to continue; missing the cutoff removes them from the event. Last Person Standing entrants receive a Discovery Tour pass and finishing the 24th lap upgrades that pass to a Hidden Wonders Tour.
Ruck division rules require weigh in. Runners under 150 lb must carry 20 lb; those over 150 lb must carry 30 lb. No trekking poles allowed. The event is cupless; participants should bring their own cup or bottle. One on-course aid station serves the 16 mile race and a full aid station is located at the finish/next lap arch with daytime and nighttime food options. Chip timing is used and chips must be worn on the ankle. The event enforces Leave No Trace policies and has marked courses with signs and tape. Visit the organization's website for the most recent information.
