Best time to go we think is spring as soon as the campgrounds open. That is late May, but all CG's are different. Busy, but not nearly so much as later in the season. The busiest area in around Old Faithful and south to Grand Tetons NP. We've stayed in tents and hotels there, but haven't yet brought the trailer. It is so big, it is easy to spend weeks or more there, but the longest we have spent is a week. Having been to Yosemite and Yellowstone in shoulder seasons, I think Yosemite is busier as most tourists at Yosemite stay in the valley and that is a lot smaller than Yellowstone. Alsop, Yosemite is a lot closer to large cities and it is easier to get to.
Glad the volcano didn't blow while you were there.
Gene
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