These are 11 National Natural Landmarks in Idaho.
| Name | Image | Date | Location | County | Description | |
|---|---|---|---|---|---|---|
| 1 | Big Southern Butte | 1976 | Atomic City | Butte | A 2,500 ft Rhyolitic dome that rises over the Eastern Snake River Plain. It illustrates the scope and dimensions of Quaternary volcanism in the western United States. | |
| 2 | Big Springs | 1980 | Fremont | The only first-magnitude spring in the country that issues forth from rhyolitic lava flows. | ||
| 3 | Cassia Silent City of Rocks | 1974 | Cassia | Monolithic landforms created by exfoliation processes on exposed massive granite plutons. | ||
| 4 | Crater Rings | 1980 | Elmore | Two adjacent and symmetrical pit craters that are among the few examples of this type of crater in the continental United States. | ||
| 5 | Great Rift System | 1968 | Blaine, Minidoka, Power | A tensional fracture in the Earth's crust. | ||
| 6 | Hagerman Fauna Sites | 1975 | Twin Falls | Contains the world's richest deposits of Upper Pliocene age terrestrial fossils. | ||
| 7 | Hell's Half Acre Lava Field | 1976 | Bingham, Bonneville | Fully exposed pahoehoe lava flow. | ||
| 8 | Hobo Cedar Grove Botanical Area | 1980 | Shoshone | An outstanding example of pristine western red cedar forest. | ||
| 9 | Menan Buttes | 1980 | Jefferson, Madison | Contains outstanding examples of glass tuff cones, which are found in only a few places in the world. | ||
| 10 | Niagara Springs | 1980 | Gooding | Least developed of the large springs discharging into the Snake River from the Snake River plain aquifer system. | ||
| 11 | Sheep Rock | 1976 | Adams | Horizontally layered lavas that represent successive flows on the Columbia River Basalt Plateau. |
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