We moved our little flock of chickens from the brooder to a pen in the garage when they were four weeks old. At eight weeks, we moved them into the hen house with an attached outdoor run. They spent four weeks getting to know and love their new home. At 12 weeks old, we felt they were large enough and well adjusted to their environment, and that's when we let the young ladies out to free-range for the first time. Enjoy the grand outdoors!