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My experience in Alabama is that they will usually roost somewhere around 30 minutes prior to sunset. When I go to roost a bird---I like to be where I can watch about an hour prior to sunset.

i tend to agree with sour1, but you can' t every really tell, so it is good to be there early. Something like rain or a storm can throw the birds off. For example, i watched some roost right at dark, and hte day before it was about 30 minutes prior to dark. I would just be there about an hour before like sour1 said.