I'm up in Billings, MT and my vote is also for the Optima Red Top. My 'stock' battery that came up from Phoenix in July 2004 finally ate it a few months ago, but did have some definite trouble starting in sub-freezing temps, and the Optima will be king. Both my YJ and my wife's 98 XJ have them and I have no worries about CCA, even if the temps do get below -23F again this winter.