Why chickens won't go into their coop?

Chickens seem to be early roosting birds. So as the light fades they find a place to roost. If they stay out of the coop then they may have not wanted to climb into a dark place if the light is fading. If your coop has electricity put a night light or a timed light to encourage the birds to come in even after the light fades. Also try feeding them at dusk inside the coop.