Fort Union National Monument


Fort Union was a military outpost on the historic Santa Fe Trail first constructed in 1851.  An earthwork fortification was built during the Civil War before Confederate troops were pushed back into Texas after a nearby battle in early 1862 (see Pecos National Historical Park).  At its peak, 1,666 soldiers were stationed here, making it the largest fort in the southwest U.S.  This expansive post was abandoned in 1891 and officially became a National Monument in 1954.


Museum, film, adobe ruins, wagon ruts on the Santa Fe National Historic Trail

Must-Do Activity

Fort Union was not the most popular place to be stationed in the 1800s, especially for the military wives who bemoaned the constant winds and frequent dust storms.  That said; expect it to be windy during your visit.  The adobe walls here are smoothed by years of erosion and appear to be melting back into the prairie soil from which their bricks were formed in the 1860s.  If you line it up right, you can take a neat photograph where all the window frames are in a row.

Best Trail

Wagon ruts can be seen at Fort Union since it was located on the 1,200-mile Santa Fe National Historic Trail (like Fort Larned in Kansas and Bent’s Old Fort in Colorado).  Since there was no stockade around the fort, walking to all of its ruins covers quite a distance (like Fort Laramie in Wyoming).

Instagram-worthy Photo

The smooth adobe walls make a great backdrop for a wagon that looks like it needs a fresh coat of paint before it hits the Santa Fe Trail again.

Peak Season





Road Conditions

The fort is not far off Interstate 25, but the last portion of the drive is a graded dirt road, as is the parking lot.


Storrie Lake State Park is 33 miles from Fort Union and there is also free camping in the summer at Maxwell National Wildlife Refuge located just off Interstate 25.

Related Sites

Bent’s Old Fort National Historic Site (Colorado)

Fort Larned National Historic Site (Kansas)

Pecos National Historical Park (New Mexico)

Explore More – When did Spain grant Mexico its independence, opening up commerce with the United States and starting the Santa Fe Trail?

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