pretty much all seems ok. they are just going to make a mess with it anyway. I've used timothy hay for rabbits in my quail cages and random bales of whatever was available and cheap. they love it all and it looks like a wild party when I add it.
getting down into the teens is unusual but freezing weather can be expected to last days/ weeks. Their natural habitat includes siberia and there is a very active canadian coturnix group on fb so I know they can take the cold. Several very good US and International quail groups on FB too.
first winter but will provide answers I've know and then others I've seen or heard
move outside once fully feathered, 3-4 weeks.
I am doing extra light with a solar rope light draped over cages
In texas but and we freeze but not to any level that should endanger quail.
mixture of rabbit...