Great Springs Trail Race - Natural Bridge Caverns

Mark your calendars for an exhilarating experience on Saturday, September 20, 2025, and be a part of our most unique race yet! Dive into the heart of the earth and race through the awe-inspiring Natural Bridge Caverns in San Antonio, where adventure begins underground. As you sprint from darkness into daylight, you'll explore stunning trails, rolling hills, and lush woodlands, choosing your challenge from distances between 4 to 16 miles, or truly test your limits with the Last Person Standing category. This event isn't just about the run; it's a chance to support the vital Great Springs Project and learn about the critical Edwards Aquifer during your journey. And don't miss out—register by August 26 for some cool swag including a race shirt to remember your subterranean sprint by!