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Great Springs Trail Race - Natural Bridge Caverns logo

Great Springs Trail Race - Natural Bridge Caverns

Sat, Sep 26, 2026, 7:45 AM CDT

Location
San Antonio, TX
26495 Natural Bridge Caverns Rd., 78266
Type
TRAIL
Official registrationPast results (if available)

Sign up and verify details on the organizer’s official page.

At a glance

Start your trail race deep inside Natural Bridge Caverns, then emerge to scenic trails while supporting sustainable clean water efforts.

  • Scenic
  • Quirky
  • For a Cause

Embark on a truly unique trail adventure at the Great Springs Trail Race, beginning deep within the Natural Bridge Caverns. This event offers breathtaking views as you emerge from the caverns to wind through beautiful trails, flowing hills, and wooded sections. Choose from various distances, including a 16-mile option, all while supporting the vital work of the Great Springs Project in preserving clean water for San Antonio. It's an opportunity to connect with nature and contribute to a meaningful cause.

What to expect

Experience a one-of-a-kind start line deep within the Natural Bridge Caverns.Run scenic trail routes over hills and through wooded areas.Contribute to the Great Springs Project's mission for clean water.

Standout details

  • Start line inside Natural Bridge Caverns
  • Support Great Springs Project for clean water
  • Scenic trail course with hills and woods
  • Swag included for all racers

Auto-drafted from the public listing — confirm details on the official event page before signing up.

Distances & registration

7 options

Registration for all distances is through the official signup link above.

  • 1 Miles

    Sat, Sep 26, 10:30 AM CDT · From $14.05

    Opens Nov 21, 2025, 7:00 AM CST · Closes Nov 30, 2025, 6:59 PM CST

  • 4 Miles

    Sat, Sep 26, 7:45 AM CDT · From $77.35

    Opens Nov 21, 2025, 7:00 AM CST · Closes Nov 30, 2025, 6:59 PM CST

  • 8 Miles

    Sat, Sep 26, 7:45 AM CDT · From $98.45

    Opens Nov 21, 2025, 7:00 AM CST · Closes Nov 30, 2025, 6:59 PM CST

+ 4 more options
  • 16 Miles

    Sat, Sep 26, 7:45 AM CDT · From $124.83

    Opens Nov 21, 2025, 7:00 AM CST · Closes Nov 30, 2025, 6:59 PM CST

  • GSTR - Natural Bridge Caverns - LPS Run (Last Pers…

    Sat, Sep 26, 7:00 AM CDT · From $151.20

    Opens Nov 21, 2025, 7:00 AM CST · Closes Nov 30, 2025, 6:59 PM CST

  • GSTR - Natural Bridge Caverns - LPS Ruck (Last Per…

    Sat, Sep 26, 7:00 AM CDT · From $140.65

    Opens Nov 21, 2025, 7:00 AM CST · Closes Nov 30, 2025, 6:59 PM CST

  • GSTR - Natural Bridge Caverns - 8mi Ruck

    Sat, Sep 26, 7:45 AM CDT · From $103.73

    Opens Nov 21, 2025, 7:00 AM CST · Closes Nov 30, 2025, 6:59 PM CST

Vibe Check

Steady Effort

Trail course

  • Mostly trail

Partial data — terrain or weather signals missing.

The course

  • Trail
From the organizer

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)

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