National Monument
Fort Union National Monument
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.
Park Photos

Blue skies and billowing clouds frequently add to the incredible viewshed that surrounds the monument grounds.
Credit: Ron Harvey - Fort Union National Monument





Activities
Operating Hours
The monument grounds and visitor center are generally open 7 days a week, from 8:00 AM - 4:00 PM. The monument is closed Thanksgiving Day, Christmas Day, New Year's Day.
| Day | Hours |
|---|---|
| Friday | 8:00AM - 4:00PM |
| Monday | 8:00AM - 4:00PM |
| Sunday | 8:00AM - 4:00PM |
| Tuesday | 8:00AM - 4:00PM |
| Saturday | 8:00AM - 4:00PM |
| Thursday | 8:00AM - 4:00PM |
| Wednesday | 8:00AM - 4:00PM |
Weather info
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.Events
Special Event
Fort Union National Monument“A Play of Candlelight” Annual Program
Campfire/Evening Program
Guided Tour
Living History
Talk
View eventRepeating EventDate(s)
Sep 5, 2026





