Can they start sleeping outside now?

[KikiDeAnime]

The nightly temps are going to be in the high 40s/low 50s
The 3 Buff Orpingtons are 4-5 weeks old. I'm not worried about the 2 Mille Fleur D'Uccle chicks as they are fully feathered and 8 weeks old. The Buffs are bonded to the D'Uccles so I can't separate them.

Will the D'Uccle chicks and the straw bedding help keep them warm enough?
Are they old enough to sleep outside now?

Thanks in advance!

 

[chickens really]

Put shavings in the Coop and they should be okay or bring them in at night only...