Hagerman Fossil Beds National Monument

Hagerman Fossil Beds National Monument is a protected paleontological site in south-central Idaho that preserves extensive Pliocene fossil deposits. It is best known for rich vertebrate fossil assemblages, including the well-documented Hagerman Horse.

Fossil discoveries in the Hagerman area began in the early 20th century and led to systematic paleontological work that established the scientific importance of the deposits. The site was later protected to preserve its fossil resources and to allow research and public education about the Pliocene fauna of North America.

The monument lies on the southern bank of the Snake River near the small town of Hagerman in south-central Idaho. The surrounding landscape is river valley and semi-arid plain, with the nearest regional service centers located in other communities of south-central Idaho.

• Age and fossils: The site preserves Pliocene-age fossil beds that are roughly 3 to 4 million years old and are noted for abundant vertebrate fossils including multiple specimens of the Hagerman Horse.
• Visitor note: Trails are short and interpretive; the visitor center provides the main fossil displays and is the best first stop for orientation and ranger programs.

What to See#

• Visitor Center and exhibits: A visitor center with interpretive exhibits that explain the Pliocene fossil record of the region, local geology, and displays of the Hagerman Horse and other recovered specimens.
• Fossil beds and trails: Exposed fossil-bearing deposits and a network of short trails along the Snake River that provide access to viewing areas and interpretive stops about the paleontology of the site.

• Begin at the Hagerman Fossil Beds visitor center to learn which trails and overlooks are open and where interpretive displays and viewing areas are located.
• Spring and fall offer the most comfortable conditions for exploring the badlands and photography-expect hot summers and cold winters in this part of Idaho.
• Fossil excavation is not open to the general public-ask rangers about public viewing spots, exhibits, and any ranger-led programs before heading onto trails.