Bracken Cave Preserve
Jonathan Alonzo

Bracken Cave is the summer home of more than 20 million Mexican free-tailed bats (Tadarida brasiliensis), making it the world’s largest bat colony and one of the largest concentration of mammals on earth. The emergence of these millions of bats, as they spiral out of the cave at dusk for their nightly insect hunt, is an unforgettable sight.

Bat Flight season at Bracken Cave Preserve runs from May through September. The preserve is currently closed.

We are developing our plans for the 2021 season, while also continuing to monitor the evolving situation with the COVID-19 outbreak. We will notify members by email soon and keep this page updated about the opportunities to experience the wonder of bats at Bracken Cave this year.

Visitation is generally reserved for Bat Conservation International Members. Members have many opportunities during the season (mid May – Mid Sep) to attend member-only events.

If you are NOT already a memberjoin here. A registration access code will be emailed to you approximately 2 weeks before registration opens. If you join after the initial registration access code is emailed, this code will be included in your confirmation letter.

If you are already a member – a registration access code will be emailed to you approximately 2 weeks before registration opens. Members supporting BCI with a $45 annual membership and those who have added an annual membership to an adopt-a-bat may bring up to 3 guests. Members supporting BCI monthly or with a $60 or more annual membership may bring up to 5 guests. These members will also have earlier access to register for a Bat Flight. Members may attend one Member Bat Flight at Bracken each season (1 Membership = 1 Member Bat Flight per year).

If you are trying to book a group visit for your club, troop, class or other organization, email

For other commonly asked questions about visiting Bracken Cave Preserve, check out our Visitation FAQS.