Great Springs Trail Race - Natural Bridge Caverns
About this race
Saturday, September 26, 2026.
Join us for our most unique race ever! Starting in the Natural Bridge Caverns, which is part of the Comal Caverns network, this race kicks off with breathtaking views of the world below our feet as the start line is in the depths of the Natural Bridge Caverns. Once you emerge to the sunshine of a beautiful day, you’ll wind your way through beautiful trails over flowing hills and through wooded sections. You can choose from 4 to 16 miles distance or go big with the Last Person standing format.
Natural Bridge Caverns in San Antonio.
This race is made possible by the great work of Great Springs Project. Don’t know what that is yet? Check out this link or just come to the race and learn how the Edwards Aquifer under these trails is critical to sustainable clean water for our growing cities. We are incredibly proud to support their grandiose efforts, alongside the city of San Antonio via this trail race!
While every racer will get some cool swag, September 1 is the deadline to get a shirt.
Click Here for Tejas Trails Policies (you really do want to know this stuff)
Pick your distance
Trail running
GSTR - Natural Bridge Caverns - 16mi
GSTR - Natural Bridge Caverns - 8mi
GSTR - Natural Bridge Caverns - 4mi
GSTR - Natural Bridge Caverns - Youth 1- Mile Trail Race (12 & under)
The Youth Trail Run is for Kids 12 & under and will be sure to please our youngest trail runners quest for rugged adventure! The distance is approximately 1 mile and parents may run with their kids at no cost. Each young runner gets a finisher's medal! **T-shirts are not included but are available for purchase for $10 during registration. Tejas Trails Youth T-shirts are non-event specific and must be picked up on Race Day during Packet Pick Up.** [Click Here for Tejas Trails Policies](http://www.tejastrails.com/policies) (you really do want to know this stuff)
Typical race-day weather
Based on 9 years of Open-Meteo archive data for this event's race dates in San Antonio, plus the 3 days either side.
The sun rises at 7:24 AM and sets at 7:25 PM local time (CDT) in San Antonio on September 26, 2026 — 12h 01m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 253 San Antonio events
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