This year will be my 5th ski trip to Jackson Hole. The previous four were all the last week of March -- when my kids had spring breaks. Every year, around the second week of March, the day-time temperature there starts to climb above freezing, sometimes even into the low 40's. That, along with the southern exposure of many of the slopes, contributes to the "non-Newtonian" snow in late March that King Grump referred to. I had a blast every one of the previous times -- notwithstanding an injury on the last one -- but I'm really looking forward to skiing there the February dates of the Gathering.
My last time there (2017), I finally skied the Hobacks. My daughter and I dropped in from the upper entrance of Rendevous. It took forever to get down, and the snow was not friendly (this was, like, March 25) -- but it was awesome! For one thing, although the trail map shows several different Hobacks trails, essentially it is all one huge side of the mountain, with a couple gullies. Also, for the whole 45 minutes (if memory serves) it took us to ski down to the lower traverse, we saw no other human beings. I'm ready to try it again.