FLUFFY!! This is too adorable! Ugh, why do chickens have to be so cute. Someone I follow on IG has bantams (including d'Uccles) up in Canada, so I'm feeling pretty confident.
There are many breeders around with them and other bantams. I would say they should be fine with their fluffy feather coats. Maybe not if you have heavy snowfalls - but then any chook would have issues with heavy snowfalls.