Mine had the same problem and by advices from this forum, I've started to light a small patio light near the runway to the coop and for the past couple of nights they are climbing nice and fine to bed. Does your coop have a window?
Take a look at the forum post where I got my advices, here - https://www.backyardchickens.com/forum/viewtopic.php?pid=6255167
Like someone said - "They will eventually learn"
good luck with your hens.
Take a look at the forum post where I got my advices, here - https://www.backyardchickens.com/forum/viewtopic.php?pid=6255167
Like someone said - "They will eventually learn"
