Like everyone else said, try it close to dusk the first time. My suggestion is teach them a call (I use the side mouth click you usually hear people with horses use, that sound travels very far). I always used my call from day one when giving scratch or treats so they know that noise is something they want to run to. Now I let them out and they do their thing, I do mine, if I look outside and don't hear or see them (they like to Jailbreak into the cattle field upon occasion) I stand on my porch and call them, works every time. If I unexpectedly have to leave after letting them out I trot myself on back to their coop, stand inside and call them in... They have a full acre to play in, plus a few spots on the other side of the fence, and I know when the boss says its time for his girls to got to bed they all walk two by two behind him until they are at the foot of the steps, where he waits until everyone is inside before entering. Once I see him standing on the top step just outside the door I know everyone is in and its time to close up shop (and head count of coarse).