At what temporature can I out the chicks outside? I'm thinking they'd still need to be in the brooder with a lamp for a bit, even outside. We had our first rain of the year and discovered that part of the run area gets pretty muddy. What can we do so this won't cause issues? Sand? They will mostly be in the run. I am nervous to let them out of the run as we don't have a fenced yard and I'm not sure I could keep them off the close rail road tracks or the street, lol! Advice?