The Cave Guide
Formations inside Inner Space Cavern, Georgetown, TexasPhoto: Rvassar, CC BY-SA 3.0

Inner Space Cavern

Georgetown, TX
72°F
inside, all year
20 min
on the main tour

A cavern right off Interstate 35 in Georgetown, north of Austin, with tours every 20 minutes and a steady 72°F inside.

The story

Inner Space Cavern was discovered by a Texas Highway Department core drilling team in the spring of 1963 while taking six-inch core samples to test whether the ground could support a large highway overpass. The drill bit dropped 26 feet after breaking through 40 feet of solid limestone. The Texas Speleological Society secured permission to explore, and the first group of spelunkers entered in November 1963, lowering people down the narrow shaft on a rope tied to an automobile. Over the next several days more than 7,000 feet of cave was surveyed. The cave was opened to the public in the summer of 1966.

Found
Spring of 1963
Open to visitors since
Summer of 1966

History source: innerspacecavern.com.

Tickets and timing

How long it takes
Tours leave about every 20 minutes.
Hours
Mon–Fri 9am–4pm, Sat–Sun 10am–5pm. Closed Thanksgiving, Christmas Eve, Christmas Day and Easter.
Booking
Same-day tickets only at the cave. Future dates can be booked online for select times.

Getting around underground

The walk
Adventure Tour: walk one mile along steep, wet and/or uneven pathways. Hidden Passage Tour: walk 1 mile along unimproved cave floors with narrow passages and large, uneven steps.
Wheelchairs
The cave pathway is not wheelchair accessible due to steep and uneven slopes; the gift shop, snack bar, picnic area and restrooms are wheelchair accessible.
Strollers
Strollers are not allowed in the cave because the pathway has steep and uneven slopes.

Dogs, weather and what to wear

Dogs
Only service animals as recognized by the ADA are allowed in the cavern; emotional support animals are not permitted. Pets can be looked after during a tour if the owner provides a kennel, at no fee; pets without a kennel will not be watched. Do not leave pets in the car during a tour. Leashed pets are permitted on the grounds and inside the main building outside the cavern, and owners must clean up after them.
When it rains
Rain doesn't affect the cave and it doesn't flood.
Temperature
72°F / 22°C year-round, feels closer to 80°F with the humidity

Good to know

Minimum age
No age limit for the Adventure Tour; Hidden Passage Tour minimum age is 7; Wild Cave Tour minimum age is 13
Best time to go
Normally the wait is less than 30 minutes; Spring Break and holidays are busier, so waits can be longer. Check the events calendar for scheduled school groups.
Photos
Point-and-click photography is permitted. No monopods or tripods. Visitors must stay with the group and not lag behind. No flash when photographing a bat. Photography clubs may rent the cave before opening, in which case tripods are permitted.
Food and drink
A snack bar is on site. No loose items are permitted on the Saber Tooth Zip Ride.
Wildlife
Bats may be seen; do not use flash when taking a picture of a bat as it may disturb them.
On site
Gift shop, Snack bar, Fudge, Picnic area, Gemstone panning, Saber Tooth Zip Ride

Getting there

San AntonioDallasHoustonEl Paso

4200 S. I-35 Frontage Rd., Georgetown, TX 78626

Directions in Google Maps

Distances are straight-line from each city center.

Questions people ask

How long does a visit to Inner Space Cavern take?

Tours leave about every 20 minutes.

How cold is it inside Inner Space Cavern?

72°F / 22°C year-round, feels closer to 80°F with the humidity.

Can you visit Inner Space Cavern in a wheelchair?

The cave pathway is not wheelchair accessible due to steep and uneven slopes; the gift shop, snack bar, picnic area and restrooms are wheelchair accessible.

Are dogs allowed at Inner Space Cavern?

Only service animals as recognized by the ADA are allowed in the cavern; emotional support animals are not permitted. Pets can be looked after during a tour if the owner provides a kennel, at no fee; pets without a kennel will not be watched. Do not leave pets in the car during a tour. Leashed pets are permitted on the grounds and inside the main building outside the cavern, and owners must clean up after them.

Do you need to book Inner Space Cavern in advance?

Same-day tickets only at the cave. Future dates can be booked online for select times.

When was Inner Space Cavern discovered?

Spring of 1963, according to the cave's own history.

Is there a minimum age for Inner Space Cavern?

No age limit for the Adventure Tour; Hidden Passage Tour minimum age is 7; Wild Cave Tour minimum age is 13

Where is Inner Space Cavern?

4200 S. I-35 Frontage Rd., Georgetown, TX 78626

Checked on 2026-10-22 against innerspacecavern.com. Prices and hours change, so confirm on the official site before you drive out.

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