A draw back to freezing I discovered when I was living at 10,000 ft, where it would freeze over night a lot , is that that repeated flexing over time cracks the leather in boots. I would leave my equipment hanging in the garage and it would be frozen in the morning. First thing, i would thrown on my equipment and drive the short distance to the river.
Thus don't unfold your waders or pull you line off the reel or put your frozen boots on until it has had time to at least partially thaw.
disinfect your wading equipment. wash boat. disinfect livewells / sumps, wash ur dog