I've been out there in December, you could see the dark that may have been water, but the playa was too mushy to risk driving out to find out for sure. We drove in a few hundred yards and stopped, the ground felt spongy, springy as we walked. We had Larry's folks with us so decided that getting stuck was a Bad Idea. It was cold, and the wind was biting. Made me glad I was wearing leather.
It gets cold enough to freeze, but I don't know if it actually makes a sheet of ice. It would only be inches? I'm only familiar with the salt flats in Utah and those don't freeze, too salty?
Paging mr. Science ...
Some sunshine, some dust, a little paint and a tutu. Yeah.