I came down from Great Falls, MT to ski at Jackson and do some winter camping in the park. The National Park website states that they keep the "campground" open in the winter. This campground is a the parking lot for the normal summer campground. It is iced over and not very easy to find, especially if you get there late in the day. However, there is an open and heated bathroom available which is a huge bonus. I had a great time camping here even though the night reached -30F. The only reason it received 3 stars is due to the comparison between Mammoth Hot Springs winter campground which is fantastic.