Fort Union National Monument

Fort Union National Monument preserves the remains of a 19th-century U.S. Army fort and associated facilities in northeastern New Mexico. The site interprets military and commercial activity along the Santa Fe Trail during the 1800s.

Visitors can follow trails past adobe ruin foundations, reconstructed structures and a visitor center with exhibits on the fort’s role as a supply depot and military post. The monument covers an archaeological footprint with visible building outlines and informational signage.

The fort was established in the mid-19th century as a military post and supply depot supporting operations along the Santa Fe Trail and regional frontier duties; it was occupied through the late 19th century. Over time the post was abandoned and the ruins have been stabilized and interpreted by the National Park Service.

Fort Union lies in a high plain near Watrous and Las Vegas, New Mexico, in gently rolling grassland; the site is accessible from Interstate 25 and is roughly 60-80 miles northeast of Santa Fe depending on route.

• Interpretation: Interpretive trails and a visitor center explain the site’s role on the Santa Fe Trail and its function as a 19th-century army supply depot; guided walks pass reconstructed buildings and archaeological remains.
• Operational period: The fort was active from the early 1850s through to the late 19th century and played a logistic role in military operations and protection of commerce on the Santa Fe Trail.

• Plan an early-morning visit to avoid afternoon heat and strong plains winds and to see the ruins in cooler, calmer conditions.
• Stop in at the visitor center on arrival for maps and the short interpretive trail route-the monument is compact but spread out and the center orients you to the best viewpoints and signage.
• If possible visit on a weekday or outside peak summer months to avoid larger tour groups that tend to arrive midday; the site feels far quieter in the shoulder seasons.