I lived and worked in Island Park, Idaho, about 25 miles west of West Yellowstone. I was working for the US Forest Service at the time back in the 1970's. The first summer I worked there it snowed 12 inches the weekend of July 4th. For you really focused wilderness freaks, look at going to the very SW portion of Yellowstone at the Beckler Ranger Station. You can park there and take the trail to the Beckler River. Most unbelievable trout stream in North America. Watch for bears, but worth the effort.
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