Yellowstone normally opens around the end of April/May. They don't clear the snow until around that time. Paulette and I spent three summers there (2008,2009 2010), and when we arrived the first year in May, they had just cleared 2-8 feet of snow from the roads. The shots below were made 10 May 08.
Unless they have just added something new, there are no RV spots in YNP that will accommodate a 45' bus. The park of choice is Yellowstone Grizzly RV Part, just 4 blocks outside the West entrance to the Park. Their # is 406-646-4466. There is another park (Yellowstone Park KOA) that will handle 45' rvs, but they are 6 miles from the West entrance (406-646-7606). It is very convenient to stay at the West entrance and go into the Park on a daily basis. If you have never been there, you will be pleasantly surprised. There is no other spot like it in the U.S.
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