I thought I had weathered the winter storms without any losses but I guess I missed one, about 2000 to be exact. I had one smaller tub of worms I was building up and never thought to put a heating pad under and they froze. I read somewhere worms can freeze for a short time but I guess two weeks was just a little to long.
The big tub has several thousand in it and was deep enough and the heat from the decomposing food kept it from freezing. They were not moving fast but at least they were moving.