They aren't as cold hardy as some other breeds, that is true. But if properly acclimated to the temps I think they'd be fine. Silkies are even less cold hardy you knowActually I mentioned them to the park commitee as well so don’t yell at me! Lol
Some park member said they had d’Uccles once and they weren’t cold hardy at all. It gets pretty cold here. Are your d’Uccles hardy?
My dad put heat in our coop, but I think they would be okay without it except for the very coldest days.