I thought they moulted mostly in autumn?
We've only had a small molt so far with ours, and trying to think but guess that would have been autumn/winter.
I'm not sure if I'm dreading or curiously looking forward to the frizzles first full molt after seeing they had to give the frizzles their own category on the worst molt contest lol
2 out of 3 of my frizzles don't moult too bad but the other one well he could definitely enter the worst moult some years.