When to move the chickens into the coop?

Hello again. Yeah, it's me.

I'm very sorry if I posted this question in the wrong forum...if so, please do move it to the correct location.

When is the best time to move pullets into the coop to live outside? Mine are about 4-5 weeks old and have most of their feathers. The weather here is pretty mild throughout the year so heat and cold are small issues at the most.

Next question; when they do spend the first couple of nights in the coop, is it good to not let them out to free range for the first couple of days? I read that I should keep them in there so they learn where 'home' is and will automatically go into the coop at night.

They are getting quite large now and spend several hours outdoors anyhow--they are tired of the brooder and I'm tired of them being in my house. I like them a lot--just not the odor.

Thanks in advance for any replies.

Here: have some pictures for fun.

-- this is how big they are now. Still too young to live outdoors?

-- This is Gertie. She's my friend.