Although fall migration is less spectacular than spring, it lasts much longer, from August through early December, and peaks twice during that time. Winter is generally mild and species are quite predictable. Look for greater diversity in ducks, shorebirds, and sparrows at this time. Spend several hours to several days at the Rio Grande Village Campground checking the river, cottonwood trees, and desert habitats. Cottonwood Campground, near Castolon, offers similar habitats, but often yields different species.
Ranch are both desert springs that act as hubs of activity for some desert birds.
The Chisos Mountains rise in the center of the park to nearly 8,000 feet providing a cooler, moister and more wooded habitat for birds. Hiking trails lead to Boot Canyon, summer home of a Big Bend specialty, the Colima Warbler.