Shane, The biggest concern I have about leaving my critters outdoors isn't always temperature. It's other animals getting into their area and harming them. Crazies who poison pets for fun. Psychos who toss tainted products into other people's yards. Theft of a beloved pet. Abuse of that pet by the ignorant, the kids or neighbours. I strongly recommend never leaving ANY pet out-of-doors unsupervised. Many years ago, having worked for the local SPCA for 2 years, I learned many harsh lessons about cruelty, that's the foundation of my advice to you. Monica Calgary Ferret Club [log in to unmask] [Posted in FML issue 2301]