Great Springs Trail Race - Natural Bridge Caverns

Prepare for an unparalleled trail running experience at the Great Springs Trail Race - Natural Bridge Caverns, set for September 26, 2026, in scenic San Antonio, TX. This event stands out as the only race in Texas to begin within the depths of a cave, immersing runners in the breathtaking subterranean wonders of the Natural Bridge Caverns for the first quarter-mile. After emerging from this unique underground start, participants on the 4M, 8M, and 16M courses will navigate a challenging and picturesque journey across "flowing hills and through wooded sections" of the Texas Hill Country. Expect a mix of terrain, including paved roads, gravel paths, grassy fields, and rocky, technical sections that demand trail shoes and offer stunning natural vistas. For the ultimate endurance test, the Last Person Standing format challenges athletes on a continuous loop, pushing mental and physical limits.

Typical race day conditions in late September feature highs around 90F and lows around 69F, with a low chance of precipitation. While surface temperatures will be warm, the initial cavern section offers a unique microclimate, consistently around 70F with high humidity. Runners will find well-stocked aid stations along the course, described as "on point" with friendly staff, providing everything from water and Tailwind to fruit, sandwiches, and various snacks, with hot food options for overnight LPS racers. Organized by Tejas Trails, known for their world-renowned and reflective course markings, you can focus on the run without fear of getting lost.

The Great Springs Trail Race offers more than just a run; it's an adventure that supports the vital Great Springs Project, highlighting the importance of the Edwards Aquifer to the region's clean water supply. Beyond the race, participants can enjoy the Natural Bridge Caverns' other attractions, making it a perfect destination for both runners and their supporters. With a relaxing race hub and a unique finisher's medal, this event promises a memorable and impactful experience for trail enthusiasts.