Yellowstone trip

We just came back after a stay at West Yellowstone. I'd recommend later Sept and early October, weather was cold at first but got great. Crowds not too bad. If we did it again, I'd stay at West Yellowstone again then go into the park for part of the time to save some travel. Also, late season time will give you good discounts in most of the stores for shopping as they are getting ready to close for the winter. Some roads close around that time too so watch for those as it will severely restrict or add extra miles to get where you want to go. Take lots of pictures as there is so much to see. I'd also highly suggest ending up driving out the east gate and spend time in Cody, Wy! Awesome drive. We even stopped at Shoshone Lodge and rode horses for a couple of hours in the same mountain ridges you see along the beautiful highway.

Reservations for summer of 2015 are going on right now. We already have reservations for Fishing Bridge RV Campground in July. When we tried to make another reservation at one of the dry camping campgrounds there were no sites left for rigs of our size. In other words, make your reservations now for campgrounds in the park.

make a reservation at fishing bridge campground for part of your stay. the only place with FHU. then before and after you can bounce around in the other campgrounds.
bumpy

Allow plenty of time for traveling within the park. It's ginormous in there.

We stayed outside the park and kinda regretted it since it would take us about an hour to get to the park from Yellowstone's Edge campground.

We are planning a similar trip. I recommend you do a search on this forum as a start since this is an often asked question and there is a lot of information out there. Also check out the National Park campground info since it gives you some great ideas.