Oh yes! I do this with all my chicks once the weather is nice. I have a section of rolled fencing, and I make a circle with it, sort of like a playpen with no bottom. Then I put that in a nice, grassy spot. The chicks seem to love it. I usually sit in a chair outside to watch them at first, then I will let them be in the fence alone--of course I'm always near by.
How funny! I have three glw chicks that are five weeks old right now, and I was thinking the exact same thing. They're ready for some outside time. Also at this age, they are pretty well feathered.
Just one thing....watch so they aren't in the hot sun too long on warmer days, or just make sure you put them out in a shady spot.
Have fun!
Sharon