UPDATE: We got the chicks, they spent yesterday outdoors in the run by themselves. The older chickens were let out to free roam. They did pretty well and huddled together once it got a bit chilly. I put them back into a cage under the heat lamp. Today it's pretty chilly AND raining. I didn't let them out at all. Hoping soon i can let them out everyday, super rainy here in Michigan during the spring.