at what age?

[Mother of All]

At what age can I let a mother and her babies go back with the rest of the flock?

 

[Ridgerunner]

That depends on a few different things. The most important to me is how much space you have for Mama to work. I am a proponent of letting Mama and the chicks join the flock as soon as Mama wants to take them off the nest, but we all have different conditions and set-ups so there is no one right answer for everyone. You might find this thread of interest.

Raise with flock? thread
https://www.backyardchickens.com/forum/viewtopic.php?id=215937&p=1

Good luck!