The “Teton Valley” is known as the Idaho side of the Tetons and often referred to as the “quiet side of the Grand Tetons” because it is just that–a lot less busy than the Wyoming side!
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The Teton Range contains some of the oldest rocks in North America, similar to those exposed in other major mountain ranges of the western U.S., including the Bighorns, the Gros Ventre and Wind River ranges.
If you want to enjoy towering mountains and beautiful lakes, Grand Teton National Park may be for you. If you would rather spend your time exploring geysers and wildlife, Yellowstone National Park may be for you. Both national parks are beautiful and offer many things to do, so you cannot go wrong with either!
Mountain landscapes shaped by frost action, gravitational transport, and stream erosion alone generally have rounded summits, smooth slopes, and V-shaped valleys. The jagged ridges, sharply pointed peaks, and deep U-shaped valleys of the Tetons show that glaciers have played an important role in their sculpture.
It is beautiful and so much smaller than Yellowstone! If you have time in your trip to at least drive thru the Grand Teton national park, definitely do it. It is beautiful and a fraction of the size of Yellowstone, so very doable in a day.