One of Austin's most unique attractions is the world's largest urban bat colony living under the Congress Avenue Bridge. From March through November, approximately 1.5 million Mexican free-tailed bats emerge at dusk in a spectacular swirling cloud that darkens the sky. The nightly emergence takes about 20-45 minutes and is one of the most memorable wildlife experiences in any American city. Viewing is free from the bridge, the trail below, or from kayaks on the water. Bat boat cruises offer an on-the-water perspective with educational narration.
Difficulty
EasyDuration
1-2 hours
Cost
Free from bridge; $12-15 for boat tours
Best Time
Arrive 30 minutes before sunset
Best Time to Go
AprilMayJuneJulyAugustSeptemberOctober
What to Bring
- •Camera
- •Light jacket
- •Patience
Requirements
- None
Pro Tips
- Peak bat season is August when pups are flying
- Stand on the east side of the bridge for best viewing angle
- Boat tours offer unique perspective from the water
- Don't stand directly under the bridge—for obvious reasons
- Bats depart north, so position yourself accordingly
Where to Go
- ➤Congress Avenue Bridge
- ➤Lady Bird Lake south shore