Nice campground at west entrance to Yellowstone NP
Nice campground, but a little pricey. The town is gorgeous. Literally at the west entrance to Yellowstone NP. Very clean and organized. It's on the edge of a large forest (possibly NP land?) with lots of trails to explore. If you are coming to Yellowstone from the south or east, it's a bit of a drive, but we went through Teton NP and it was amazing!!! Besides Yellowstone, there are a ton of things to do in the area.
Month of VisitJuly