Sorry for the brief hiatus, we were away traveling for the past week (not skiing, unfortunately). Anyways, when someone mentions summer skiing, I usually think of South America or New Zealand.
BUT, some American ski mountains plan on staying open deep into the summer. One of them is Squaw Valley. They have over 300 inches in the past month, marking their snowiest winter in history, something that is a common trend across much of the United States.
So, if you are looking to do some summer skiing and want to stay domestic, here you go. I am not sure how the conditions will be, but it is better than nothing!