the cooper spur will most likely be thin and unpleasant by mid-july - depends on how hot it gets before then of course, but i've done it on the 4th of july before - the sunshine route is an alternative if the spur's out but you're already on that side of the mountain - it is all glacier though, but the cracks are obvious by mid-summer - hell, some jackass climbed it w/ cowboy boots and a bowie knife a few years back...