As a rule, any products that are water-base, such as glue, stains, paint,
etc. are usually destroyed once they freeze. The thawing process prevents
them from recombining back to their original state. Plus, I'm sure heating
up and cooling down any wood you have in your shop is reeking havoc with the
moisture content of it.
Won't hurt the wood. Transition times between extremes are short, and wood
can't catch up. Frozen wood won't dry, though.