We’ve talked at length about the largest state park in Texas, but what about one of the smallest? Tucked away in Fredericksburg, Old Tunnel State Park is a historic site that’s also home to over 3 million bats! Watch them emerge and stroll through the park’s lush Hill Country landscape for a day well spent!

At just 16 acres in size, Old Tunnel State Park is one of the smallest state parks in Texas. It’s also the newest, having been established in 2012.

Texas Parks & Wildlife

A designated Texas Historical Marker, the park has a rich and fascinating history dating to the mid-1800s. Its namesake, a gaping tunnel cutting through a solid limestone hill, was used by the San Antonio, Fredericksburg, and Northern Railway until 1941 before it was decommissioned after being deemed unessential.

TripAdvisor/Plattonian

The park might be tiny, but it sure is mighty. It provides a seasonal home for over 3 million bats, and you can watch them emerge at dusk as they begin their nightly scavenge for a meal.

TripAdvisor/Gina E

Most of the bats are Mexican free-tailed, however there are also about 3,000 cave myotis bats in the mix. From May 1 through October 31, visitors can gaze in awe as the sky turns into a swirling mass of flapping wings and primal hunger.

Texas Parks & Wildlife

Both an upper and lower viewing platform are available for guests to watch the bat emergence. Choose whichever one you’d like - just remember to never approach or go inside the tunnel!

Texas Parks & Wildlife

If you’d like to learn more about the bats, you can sit in on the nightly educational program held during bat season.

Texas Parks & Wildlife

While the bats are the main attraction, the park also features two beautiful hiking trails that weave through the lush terrain. They’re both on a decline, as the parking lot is situated above the tunnel, so they should be suitable for most skill levels.

TripAdvisor/A Foggy Path

Just wait until you see the sweeping Hill Country views! You’ll definitely want to pull out your camera and snap a few photos.

TripAdvisor/Bill B

You’ll also see an abundance of vegetation and wildlife, from brightly colored flowers to butterflies and even white-tailed deer.

TripAdvisor/Amy F

Visit the Texas Parks & Wildlife website for more information about the park, including current hours and entrance fees.

Texas Parks & Wildlife

TripAdvisor/Plattonian

TripAdvisor/Gina E

TripAdvisor/A Foggy Path

TripAdvisor/Bill B

TripAdvisor/Amy F

Have you ever visited one of the smallest state parks in Texas? If so, we’d love to hear all about your experience in the comments!

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Address: Old Tunnel State Park, 10619 Old San Antonio Rd, Fredericksburg, TX 78624, USA