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They're plenty old enough to go outside AS LONG AS the temperatures at night are reasonable given their feathering. It should be around 60-70 degrees at night before they're allowed to sleep without a heat lamp at four weeks old.
When I introduce new babies to the Big Coop, I always confine them to the coop itself without access to the run for at least a week first. This familiarizes them with their new home, roosts and nest boxes. It will teach them where you expect them to go at night and where to lay eggs. They should have access to food and water at all times.
Week two, I let my adolescents out into the enclosed run for a week or two before free-ranging. Again, this reinforces the concept of "home" with them and they WILL return there at night. If you just let them out and expect them to figure it out on day one, you will find yourself looking a lot like Rocky Balboa in his training days, chasing chickens around at dusk. That's no fun.
We have ALL kinds of predators around here (here's a link to my blog so you can see the setting)
http://eggcartonlabels.blogspot.com/2011/05/virtual-tour-de-coop.html
I have had chickens for two years and they have always free-ranged. In two years we have lost only four to hawks. It is reasonable to expect losses if you free range but I would rather let them live as natural an existence as possible, wandering about, enjoying themselves outside than confine them to a run. I think the benefits FAR outweigh the risks. I have woods behind our coops, so there is plenty of cover for them to hide from hawks. If you don't have natural cover, consider constructing some places for them to be able to duck under when hiding is necessary (or just to get out of the sun on hot days!). We have raccoons, opossum (opposi?! lol) bears, coyote, fisher cats, bobcats and more around our area. I am confident that we can defend against most of them most of the time.
I have never lost a chicken to a nocturnal predator in the coop. It's important to reinforce the coop and run securely as chickens are completely defenseless at night.
Good luck and enjoy your new lawn ornaments!