When we think of fall, we begin to dream of pumpkins, apple orchards, and pumpkin spice lattes. While these are exciting things to look forward to, fall also brings on an exciting event that you can witness from your backyard's comfort. Fall migration in Wisconsin can begin as early as August and will continue through December. The first birds to kick off migration are swallows and purple martins. Birds move to where there are more resources, such as food and nesting locations. Insect availability drops as temperatures cool, and other food sources become scarce as the plant life decays.