Yeah as far as I know crows don't migrate. They're most active in the morning hours and the hours before dark. They go from roost to some place where they spend the day and then they come back. The key is finding their flyways. You need good camo because they can see like a hawk and are smart. Check out this site. www.crowbusters.com
I've never been successful but I also have not tried really. I'm going to get some decoys for next year along with a caller. The best crow hunting is in when it is like 40 and above IMO.

Good luck.