The ground has been warm so far which I believe will have already started the growing process underground. All they need is some moisture, which they got last night. I think they will pop up today some even with it being colder than ideal temps. Last year was my best year ever and we had a snowfall after the morels had already started growing so I don't think tonights low temps will hurt them. I have found morels in all places. Next to roads, in ditches, on bluffs, in yards, in red clay, under cedars, sycamores, ash, dead elms plus I'm sure more. This time of year I would be looking at the mostly south facing hills which will collect the most warmth and get them started earlier than on the less sunny parts. My buddy found a 3 inch morel Saturday afternoon down at the Blunk Hole on the bank. I bet there had been hundreds of people walk right past it. He drug the kayak down the bank first and turned around and found it. You just never know where one will be. All I can say is good luck and walk a LOT.