I see your from the South, I'm from central Texas. We are blessed with warmer spring temps. than most. If your birds are 21 days old, Id put them out to the coop and run in another week. I usually start introducing my birds to the outside world at 5 days old, 3 to 4 hours a day weather permitting. By the time they are 4 weeks they are in the coop full time. IMHO chickens are better off and healthier if you can get them living outdoors as soon as possible.
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