Or the heat.I'd be willing to bet they're being drawn to the light.
@KYfreerange could you post pic of the garage coop and the chicks leanto?
Is this hen still caring for the chicks:
https://www.backyardchickens.com/th...tarted-laying-may-be-adopting-chicks.1339427/
I assume you are in Kentucky, but would be good to add it to your profile.
It's easy to do, (laptop version shown), then it's always there!