Signs of autumn already

I'm seeing large flocks of Canadian geese going over my farm. They're really beautiful birds. The average size I'm seeing sis about 50 birds, either in a line, like these guys, or in a more traditional V shape. So far they haven't landed on my land, and I wonder if they will sometime. I've got geese here on the ground, and decoys do work, but so far they're all passing. One flock did fly pretty low today; maybe 200' up, sounding like a whole herd of trumpets.