We did Mr. Bubbles the weekend after Labor Day in 2015. No bugs. September is the time to do it, after it’s gotten cold and killed them off, haven’t gone back since as I always am hunting elk that time of year now. I would suspect early would be the same. What killed this trip and another reason I haven’t done another trip in the Park is that we had reserved the campsite closest to the hot spring so in theory should guarantee it to ourselves in the evening as the next closest campsite was far enough away that it would necessitate hiking back in the dark. Had a group of potheads show up right at dusk, I was naked in the hot spring. They were seasonal workers with the park (Xantera), I asked where they were camping and they were still trying to figure that out. They had stumbled through our campsite hoping it was not being used. So we hiked 16 miles with the idea of seclusion only to meet this group of guys who had hiked in from Old Faithful even though they said they tried to get a campsite but “they were all reserved so we just came anyway.”

So since then I just felt no matter where I go in Yellowstone it’s contaminated with people. I wouldn’t have been upset if it was national forest, but it pretty much deflated what was a pretty neat trip. Didn’t see any big game. Maybe I will give the Thorofare a try someday.