Originally Posted by
Roadrunner
Adam, Almost everything in Yellowstone closed by October 20th. Most stores and campgrounds closed mid Septermber. If you are planning on camping close to the Park, it will probably have to be outside the West or North entrance.
If there is any significant snow in the area, the passes will be closed. I would definitely call about road conditions before I tried to travel through the Park. I am not sure the entire Park is not closed. A couple phone numbers that may help are below. Good luck.
Park Information 307-344-7381
YNP Road Conditions 307-344-2117
Reservations (including RV Parks) 307-344-7311