Grand Teton

Grand Teton is a 13,770-foot peak in the Teton Range, rising sharply above Jackson Hole. For most park visitors, the experience is seeing its jagged profile from the valley, not climbing it. The map point marks the summit itself; it is not a drive-to stop or a public walking trail. Reaching the top is technical mountaineering for people with the right experience and equipment.

From the west, Grand, Middle, and South Teton are seen most clearly together; from the east, other peaks hide much of South Teton. Inside the park, Snake River Overlook is a well-known river-and-mountain viewpoint on US 26/89/191, about 8.5 miles north of Moose Junction. Ansel Adams made his Snake River photograph there in 1942, though the river has shifted since. For a photo, keep some river and valley below the peaks so the frame shows how sharply the range rises from Jackson Hole.

The summit is built from rock billions of years older than the mountains around it. Seafloor sediments and volcanic debris were transformed into banded gneiss about 2.7 billion years ago; magma later forced into cracks cooled into granite about 2.5 billion years ago. Those ancient rocks form the jagged high peaks.

The Teton Fault began moving about 10 million years ago. Repeated earthquakes lifted the mountain block and dropped the Jackson Hole side; the total offset approaches 30,000 feet. Ice Age glaciers then sharpened the ridges and carved the U-shaped valleys. The Pinedale glaciation, roughly 50,000 to 14,000 years ago, formed Jackson Lake.

French fur trappers used Les Trois Tetons—“the three breasts”—for Grand, Middle, and South Teton. In 1811, Wilson Price Hunt called the peaks “Pilot Knobs,” using them to orient himself while crossing Union Pass.

There is no walk-up route to the top. Snow can linger into mid-July, afternoon storms can build quickly, and rockfall can change a route; check current mountain conditions before any ascent. Overnight bivouacs require a backcountry camping permit, with climbing information available at Jenny Lake Ranger Station and Craig Thomas Discovery & Visitor Center in summer. Treat the summit as an alpine climb, not a visitor site with services.