Hagerman Fossil Beds NM contains the largest concentration of Hagerman Horse fossils in North America. The Monument is internationally significant because it protects the world's richest known fossil deposits from a time period called the late Pliocene epoch, 3.5 million years ago. These plants and animals represent the last glimpse of time that existed before the Ice Age, and the earliest appearances of modern flora and fauna.

Summer: Everyday 9:00 a.m. to 5:00 p.m. (from Memorial Day Weekend to Labor Day Weekend);

Winter: 9:00 a.m. to 5:00 p.m. Thursday - Monday (from October 1st till Memorial Weekend).