Charlie, we have stayed at Flagg Ranch twice when visiting both Teton and YS parks, and we will stay again when we return. It is very big, many sites, and many are close together, but most sites have shade from tall pines and some privacy with shrubs. The selling point of Flagg for us is that it lets us have a central base camp accessible both to Teton to the south and YS to the north. The camp offers a good restaurant for easy breakfasts if heading out early or dinner if you come dragging in from a busy day touring. The gift shop is very good, a decent store for groceries and miscellaneous, and fuel--all available. It's not a "wilderness" experience, but it is easy and provides what you need without tripping out of the parks for supplies. When we were there, a young black bear visited the lodge, kept folks indoors or in their cars in the parking lots for a while until FService staff lured it away--interesting and exciting, but then, it's Yellowstone! If we were focusing just on Yellowstone, we'd stay at campgrounds at the north or west entrances: Yellowstone's Edge or Madison River Campgrounds-both excellent, if at a little distance from the park. Since you are visiting late season, I'd imagine that the crowded conditions at Flagg and park sites will not be so annoying. Enjoy your trip! ~G
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Go, Mizzou...Tigers on the prowl!