Great Springs Trail Race - Natural Bridge Caverns

Event details

The Great Springs Trail Race at Natural Bridge Caverns takes place beginning September 26, 2026, at Natural Bridge Caverns in San Antonio, Texas. The event includes multiple distance races, a youth run, and Last Person Standing run and ruck divisions. The race start is located inside the caverns and the venue also offers above-ground attractions and tours. Tejas Trails partners with the Great Springs Project for this event.

Distances offered

• 4 miles
• 8 miles
• 16 miles
• Last Person Standing Run (4.1667-mile loop)
• Last Person Standing Ruck (2.47-mile loop)
• Youth 1 mile

Course, rules and services

All races are chip timed with ankle-mounted chips picked up on race morning. The course uses a core loop system and extensive markings, with signs at intersections for different distances. Aid support includes one on-course aid station for the 16-mile race and a full aid station at the finish/next-lap area; the series is cupless so runners should provide their own drink container. Drop bag policy: no unattended bags on the course; regular distance runners may leave bags near the race hub; Last Person Standing competitors have dedicated crew/drop-bag space and may use canopies up to 10' x 10' if properly staked. Ruck division rules require a weighted ruck (20 lb if under 150 lb, 30 lb if 150 lb or over), mandatory weigh-ins, weight carried on the back, and no trekking poles. Pacers are not allowed. Awards are given by overall and masters categories; Last Person Standing awards go to the final male and female finishers. Visit the organization's website for the most recent information.