National Park Service · New Mexico
The adobe ruins of the largest 19th-century military post in the Southwest, set on the high plains beside the deepest visible ruts of the Santa Fe Trail.
Field briefing
Fort Union National Monument changes fast with season and elevation.
Before you go
The signature experience is the 1.2-mile self-guided trail through the standing walls of the second and third forts. There are no services at the monument and the nearest towns are 28 to 31 miles away, so come with water, fuel, and food, and plan to base in Las Vegas, New Mexico.
The landmarks worth the trip. Tap any photo to enlarge.
Weather, crowds, and what the season changes about the trip.
Cool and very windy on the open prairie, with green grass and big skies.
Pack Wind layer, sun protection, and a hat that will stay on in the wind.
800F
Warm to hot days at 6,800 feet with little shade and afternoon storms.
Pack Maximum water, sun shirt, a rain shell, and sturdy shoes for the dirt trail.
Clear, comfortable days and golden prairie, the best season to walk the ruins.
Pack Warm layer for cool mornings and water even on mild days.
Cold, windy, and quiet, with snow possible and a stark, empty feel.
Pack Insulation, wind protection, and traction for icy trail sections.
Self-guided ruins trail
A 1.2-mile interpretive loop through the standing adobe walls and chimneys of the second and third forts, the largest network of adobe ruins of its kind.
Santa Fe Trail ruts
Deeply worn wagon ruts of the Santa Fe Trail still cut across the prairie beside the fort, among the most visible trail traces anywhere on the route.
Visitor center museum and film
Exhibits and a film on frontier army life, the Santa Fe Trail, and the fort's role guarding the trail through the 1851 to 1891 era.
Put the timed or highest-demand stop first, then keep the rest of the day close and low-friction. For one day in Fort Union National Monument, time Self-guided ruins trail first, then keep Santa Fe Trail ruts and Visitor center museum and film close enough that the visit still feels relaxed.
Turn Fort Union's conditions into water, pack, and sleep-system decisions.
Build around conditions
Let season, elevation, and weather set the plan.
Plan your trip
2 quick tools, already seeded for Fort Union National Monument. Tune the numbers around temperature swings, footing, layers, and how much margin the route needs.
Start with the gear decisions this park changes: footing, weather, camping, and water.
Kit Authority
Fort Union National Monument packing list
0 of 16 packed. Check items as you pack, then take this list to the store, trailhead, or campsite.
Pack planning
Use this as a constraint check while you are still shaping the trip. The active checklist becomes useful once your route, dates, and sleep plan are set.
Checklist mode
16 items, grouped for the trip you are actually taking.
The buying guides that match what Fort Union asks of your kit, with our current top picks across budget and use case.
There is no camping or lodging at the monument, and no services nearby. Las Vegas, New Mexico, about 28 miles south, is the closest town with hotels, restaurants, and a KOA campground, and Wagon Mound lies 31 miles north. Many visitors base in Las Vegas or fold the fort into a Santa Fe Trail route between Santa Fe, Pecos, and the plains.
Camping reservations
Fort Union is a free, day-use site with no campground, no lodging, and no services. There is no reservation to chase; the planning move is to base in Las Vegas, New Mexico and come prepared with your own water and fuel.
Reviewed June 11, 2026
Booking window
No in-park camping or reservations. The closest commercial camping is the KOA in Las Vegas, New Mexico, about 28 miles south.
Where to book or verify
Official NPS page with hours, the museum, and the self-guided trail.
Check for federal campground, backcountry, tour, and permit inventory tied to this park.
Campgrounds to know
Plan the last mile as carefully as the destination.
Airports, roads, entrances, and local movement belong in the same plan.
Getting there
Arrival note
Fort Union sits off I-25 in northeast New Mexico.
Car strategy
From Santa Fe, take I-25 north to exit 366 at Watrous, then drive about eight miles north on NM 161 to the monument.
Local movement
There is no public transportation and no fuel at the site, so fill up in Las Vegas or Wagon Mound first.
Pair this with lodging: the simplest base is the one that removes a real morning problem, not just the one nearest the map pin.
It is free. There is no entrance fee and no pass required to visit Fort Union National Monument.
No. There is no campground at the monument and no services nearby. The closest camping is the KOA in Las Vegas, New Mexico, about 28 miles south, where there are also hotels and restaurants.
The main feature is the 1.2-mile self-guided trail through the adobe ruins of the second and third forts, plus a visitor center museum and the deeply worn ruts of the Santa Fe Trail visible on the prairie beside the fort.
Plan one to two hours for the museum and film and the 1.2-mile ruins loop. The site is exposed with little shade, so carry water and a hat, especially in summer.