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National Monument

Fort Union National Monument

CautionJul 23, 2026

Partial Trail Closure

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Panorama of Officers Row

Blue skies and billowing clouds frequently add to the incredible viewshed that surrounds the monument grounds.

Photo: Ron Harvey - Fort Union National Monument

About

Exposed to the wind, within a sweeping valley of short grass prairie, and along the eroded Santa Fe Trail, lie the adobe walled ruins of the largest 19th century military fort in the region. From 1851 to 1891, Fort Union functioned as an agent of change, desired or not, in the New Mexico Territory and throughout the Southwest.

Activities

Guided ToursSelf-Guided Tours - WalkingLiving HistoryHistoric Weapons DemonstrationJunior Ranger ProgramShoppingBookstore and Park Store

Directions

Fort Union National Monument is located in the Northeastern portion of the state of New Mexico. 8 miles off of Interstate I-25 on State Highway NM 161. New Mexico: From Albuquerque (156 miles), Santa Fe (94 miles) or Las Vegas, NM (28 miles) take I-25 North, exit 366 at Watrous, 8 miles on NM 161. Colorado: From Denver (313 miles), Colorado Springs (243 miles) or Raton (95 miles) take I-25 South, exit 366 at Watrous, 8 miles on NM 161.

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Weather

Fort Union is situated at 6,760 feet above sea level. Daytime temperatures between June and September may exceed 90 degrees Fahrenheit. Winter temperatures often drop below 32 degrees Fahrenheit. Temperatures may vary within 50 degrees in a 24-hour period. During the winter, it is not uncommon for the temperatures to drop below 0°F (-18°C.) During the summer, expect high temperatures, intense sunlight and extremely low humidity.

News

“A Play of Candlelight” Annual Program
Aug 21, 2026

“A Play of Candlelight” Annual Program

Step into history at your Fort Union National Monument! On Saturday, Sept. 5, 2026, as dusk settles over the historic grounds, the gates of Fort Union will swing open at 6 p.m. for an unforgettable evening.

First Annual First Fort and Arsenal Tours
Aug 4, 2026

First Annual First Fort and Arsenal Tours

Fort Union National Monument proudly announces its annual First Fort and Arsenal Tours Days, offering visitors a rare opportunity to stand where Fort Union’s story began. On Saturday, August 15, and Sunday, August 16, 2026, the park will host special two-hour guided programs that bring this foundational chapter of New Mexico and Western history to life.

Jun 26, 2026

National Park Service’s Pueblo Parks Group Implements Stage II Fire Restrictions

National Park Service’s Pueblo Parks Group Implements Stage II Fire Restrictions