Cold night's starting in September. I have stayed here in summer and in fall. I prefer fall because there are not many people and you can have the lake to yourself. Summer I would not attempt it as it turns into an RV city. The lake attracts lots of wildlife and it is bear country so lock up your food, or better yet tie it up in a tree especially in fall when the bears are bulking up for winter. In summer you might not see wildlife as the hordes of campers scare them off from the lake. There are also beautiful sunset here, and nice stargazing.