Most days these past few weeks our ladies start taking to the bushes and trees come bedtime. The occasional marten is known to come by at night from time to time, so we used to pluck the chickens from the trees in the evenings, and guide them to their coop.
I got tired of it, so I set up a garden hose, and now magically it starts raining once they settle down for a night in the trees. Gets them to seek shelter in their coop pretty well. Also, I'm not the bad guy for plucking them off anymore.