umm...ok, an odd suggestion. But there is a "North House Folk School" all the way up in Grand Marais Minnesota. Not specific to quilting but all sorts of craft and art forms. Being on the shores of Lake Superior near the Canadian Border, yep, it may be cool. Also, "Madaline Island School of the Arts" which is located in Lade Superior off of the Wisconsin shore, offers some quilting classes during the summer. Again, should be cooler!