The first come first served campgrounds in the Tetons are the Colter Bay Campground and Gros Ventre campground. Both are very big and when I worked in the park a few years ago they hardly ever filled. There is also the Colter Bay RV park which is usually sold out months in advance. If you know your exact dates, call the RV park you never can tell when someone might cancel. We were in the Gros Ventre campground last year and they have a few electric only sights. It is closer to the south end of the Park and closer to Jackson. Not too much to do at Gros Ventre but at Colter Bay there are two restaurants, a grocery, laundromat and showers, and a marina where you can rent canoes or kayaks or book a spot on a cruise. Horseback rides are also available. Colter Bay also has a Park Service Visitor's Center.
