I'm new to raising chickens. How old do the chicks have to be before I can put them in the outside coop. Thanks for your help.
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I'm assuming you are talking about heat and not integrating with other chickens.
I pretty much agree with Flockwatcher, except I don't wait that long and some people still think I pamper mine. I've seen broody hens take their chicks to the roost as early as 2 weeks of age, and they cannot all get under her on the roost to keep warm. That's in the heat of summer, when the nights don't get all that cool. In colder weather, I've seen broodies take as long as 4 weeks to take them to the roosts. Weather has a lot ot do with it.
I have electricity in my coop, so I brood them there from Day 1. I don't brood in the house with all that dust, noise, and smell. I like to stay married to my present wife. To brood chicks, all you need is some heat and protection from the elements. The elements I'd worry about are wet and wind.
I have a brooder large enough that I can heat one area and let the rest cool off to ambient. Sometimes that ambient is down on the 40's of 50's Fahrenheit. The chicks play all over that brooder and go back to the the heat to warm up when they want to. To me, this accomplishes two things. I don't have to worry about keeping the entire brooder a perfect temperature. Let them decide where they are comfortable. Some people would be surprised how much time they spend in the cooler areas, even when they are less than a week old. I do have a good draft guard around it so they are protected from breezes.
The other advantage is that they acclimate to cooler temperatures. Their bodies get used to cooler temperatures so they don't need the heat as much. I think this helps me get them off the additional heat sooner.
In the heat of summer, I've turned the daytime heat off as early as two weeks, and I've turned the overnight heat off as early as 3 weeks. I could have done both sooner, but I was overcautious. Last fall, I kept the heat on until 5 weeks, then moved them to a grow-out coop that has no electricity or supplemental heat. It does have good draft proptection. When they were 5-1/2 weeks old, the overnight low was in the mid-20's. They were fine. They were sleeping in a group as they always do. There was no distress peeping.
When can yours go outside? That depends on your situation. If your coop has good draft protection and the overnight temperatures are not really cold, maybe 4-1/2 to 5 weeks without heat. This time of year in South Carolina and with no supplemental heat, I'd probably wait until 5 to 5-1/2 weeks if you cannot acclimate them first. You can still get some pretty cool nights. If you have electricity and can provide heat, you can start from Day 1.