I may be odd man out on this. I think 4:30's fine. I like knowing the birds are landing behind me as I exit the field. I want them safe and warm until the next day.
Great post.SD has way more habitat and way more birds. Where I hunt, I would fear pushing birds into nominal roosting cover if pushed at sundown. Such as a fence row or plowing. Especially late season when temps are low. Upland biologists for the DNR have always said. They've never found a pheasant dead from starvation in Iowa, but plenty from exposure. More so I feel more a sense of "Fair Play". We are coming at these birds with every modern contrivance we can come up with now. I'm old enough to remember the only hunters with trained bird dogs were doctors and lawyers. Now every other truck or SUV has a FC dog. I'm guilty too, I have beeper collars and remote trainers etc. I've shot more than my fair share of birds, so giving them a zone of opportunity before sunrise and after is a paltry concession for something that has given me such great joy and beauty.