Valles Caldera, Complex volcano in north-central New Mexico, United States

Valles Caldera is a large volcanic depression in north-central New Mexico, shaped like a broad basin with grassy valleys and several smaller volcanic cones scattered across its floor. Hot springs and streams flow through the low areas, while the surrounding slopes are forested and the higher plains are open grassland.

Valles Caldera formed about 1.7 million years ago through two large eruptions that together released roughly 600 cubic kilometers of magma. The caldera later became part of Baca Location No. 1 in 1876, was sold to the Dunigan family in 1963, and was purchased by the federal government for $101 million in 2000.

Native American groups found this place valuable for thousands of years, gathering obsidian to make tools and weapons for daily life. The landscape still shows signs of their long presence in the region.

You can hike, bike, or ride horses on trails of varying difficulty that run through the preserve. The high elevation and open areas mean weather can change quickly, so bring layers and plan your visit accordingly.

Temperature differences between the valley floor and higher elevations can exceed 30 degrees on some days, creating distinct climate zones in a small area. These variations allow diverse plants and animals to thrive in different microclimates within the same place.