Jackson Hole, fertile valley in northwestern Wyoming partially lying in Grand Teton National Park. Part of the Snake River valley, Jackson Hole extends along the Teton Range for about 50 mi (80 km). The valley abounds in wildlife, providing feeding grounds for moose, deer, and elk. Jackson Wildlife Range, within the park, provides an area for naturalist observation and study. The area also attracts many skiers because of its excellent ski conditions.