Grand Teton National Parkâs new superintendent felt the inflection point come the last week of April. Visitors to the 310,000-acre park that Palmer âChipâ Jenkins oversees seemed to start showing up, drawn to see the dramatic spine of mountains topped by the 13,775-foot-high Grand Teton and the wild things living beneath them. Suddenly it felt more summer-like, and less like the sleepy âshoulder seasonsâ of old in Jackson Hole. âYou get to a point in time in the spring where you feel the momentum shift, and on Monday it was very distinct,â Jenkins said during a April 28 walkabout down Teton Park Road.