September Special: Grown-Up Tours Get 1 Free Small Geode
Book an adult ticket online. Visit Mon–Fri (excluding Labor Day). Claim and crack open your sparkling prize.
Use code FREEGEODE at checkout.
One freebie per reservation.
Weekday Wanderers Rock
You want a little less noise, a little more space, and a little sparkle to take home.
Our Mon-Fri tours are already uncrowded and cool (a steady 68°F underground), but now they come with a bonus: a free small crack-your-own geode.
That’s a $14.99 value for free — just use code FREEGEODE at checkout!
(Limit 1 per reservation. Excludes Labor Day. While supplies last. Upgraded Large geode available on-site.)
Discover What’s Inside (Literally)
Each geode is a mystery millions of years in the making… until you crack it open.
Some sparkle. Some shimmer. All are one-of-a-kind.
It’s not just a souvenir — it’s a story.
Want to go bigger? Upgrade on-site to a large geode for just $9.99.
How It Works
- Buy any adult ticket online for a Mon–Fri tour (excluding Labor Day).
- When you check in, we’ll give you 1 free small geode per party to crack.*
- Use code FREEGEODE, we’ll give you a free small geode to crack.*
- Want to level up? Upgrade to a large geode on-site for just $9.99 (a $24.99 value).
Choose your own adventure:
Why Weekdays?
No crowds and no summer rush. Plenty of room to wander in wonder.
Cool 68°F underground – a perfect escape from the Texas heat.
Use code FREEGEODE for adult weekday tickets — while supplies last.
From Ticket to Treasure in 3 Steps
Limit 1 per reservation.
A Visitor Favorite for Free
The National Cave of Texas for a Reason
We’re home to one of the most unique natural wonders in Texas — and some pretty great stories, too.
Learn more about the cavern, our team, and what makes this place unforgettable.
