How old to climb the ramp into the coop??

[Kaizersmom]

My chicks are 6 week old and nearly fully feathered. We've been giving them some time on sunny days outside in their "run". Should they be able to climb the ramp back into their coop or do they still need assistance? This is all new for us.
Thanks!!

 

[1muttsfan]

They are old enough but might need a few lessons - just watch them for the first few days, and help them up if they need it at bedtime, or if it rains.