9 to 10 weeks old they should be fully feathered and able to swim anytime they want.Is it ok to have them jump in water at 30-49 degrees F? At 9-10 weeks old ??
I let them go in their pool.. today then panicked ... brought everyone inside after the swim bc I was afraid it was too cool for them... it was about 55 degrees.
They have down coats on under those feathers.
you are actually probably going to do them more of a disservice by bringing them in every night then if you got them acclimated to the outdoor weather by just leaving them out there.
What's hard on them is the extreme change from warm to cold.
Ducks are cold hardy. Give them a house where they can get out of the draft and some deep bedding and they will be perfectly fine.