I put mine out last night. It's been 80-85 during the day and 60-65 at night here in Salt Lake City. They are about 4 1/2 weeks old and I didn't put any heat lamp in their coop. They have been quite hilarious running around and playing chase.
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I'm planning on moving them into the coop with the grownups at just under 4 weeks, maybe sooner. My rooster does check up on the little ones throughout the day and has come running when one makes a distress call, so they're kinda pretty much already integrated into the flock. They already don't seem to care whether or not the heatlamp is on at night, though I turn it on for them anyway as they're only about 8 days old still. And one day earlier this week, the wind had quite an icy bite to it; I gave them a shelter but they didn't use it except for at nap time!