The tunnel in Old Tunnel State Park in Kendall County, Texas, United States. Formerly a railroad tunnel for the Fredericksburg and Northern Railway, the tunnel is now home to up to three million Mexican free-tailed bats (Tadarida brasiliensis) and 3,000 cave myotis (Myotis velifer) from May through October. — The tunnel in Old Tunnel State Park in Kendall County, Texas, United States. Formerly a railroad tunnel for the Fredericksburg and Northern Railway, the tunnel is now home to up to three million Mexican free-tailed bats (Tadarida brasiliensis) and 3,000 cave myotis (Myotis velifer) from May through October. Larry D. Moore · CC BY 4.0

Old Tunnel State Park

State Park · Texas · Texas Parks and Wildlife Department

Plan your visit

Know before you go

Address: 10619 Old San Antonio Rd., Fredericksburg, TX, 78624
Phone: (866) 978-2287
Official site: tpwd.texas.gov
Managed by: Texas Parks and Wildlife Department

Getting there

10619 Old San Antonio Rd., Fredericksburg, TX, 78624

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What's here

Activities & features: Day Use · Picnic Area · Wildlife Viewing

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Sources: State agency, Wikimedia Commons / editorial · updated 2026-08-23