This may be too late for you, but I climbed the Middle Sister from Camp Lake last Tuesday, July 12, from Camp Lake. Trail from Pole Creek to Camp Lake almost entirely snow-free, but lots of snowfields above Camp Lake. Most of the Southeast Ridge crest and the dreary boulder field to the west of it, however, are snow-free. We had and used ice axes and crampons--snow fields were very icy in the early morning, but snow softened quickly. By staying on the snowfield just west of the Diller Glacier, we were able to avoid a lot of the loose boulder field on the way up.