Twice. Once in CO in 1994, me and a buddy watched one for about 30 minutes in the krummholz at about 12,000 feet in the Sangres. State wildlife folks caught wind about it a couple years after the fact and interviewed us; buddy is a well-known biologist and his testimony stood up. The State folks told us there were no known breeding pairs, but that the occasional wanderer would come through...
And more recently, on a January pheasant trip in ND close to the Missouri River - saw one walking through the snow and driving wind in a farm field like it was any old Tuesday.
Neither were marmots, badgers, bears or fishers. Very cool & exciting to see.
A couple years ago my son and I were climbing up to Mt Rearguard in Montana when we came across one. He was around 100 yards away and unaware of us. Absolutely beautiful animal'I have seen about every animal that lives in the West in the lower 48. Apparently, when I was 2 years old my dad was carrying me in his arms in Southwest Wyoming when we crossed paths with a wolverine. I don't remember it obviously, but my dad said that I saw it. I've also never seen a lynx.
Just curious who has seen a wolverine in the lower 48. Go ahead and post where you have seen them as well, it would be interesting.