Organ Pipe Cactus National Monument


“The green desert” is home to dense stands of saguaros, ocotillos, and its namesake organ pipe cacti.  The monument’s 330,689 acres sit on the Mexican border of Arizona and were recognized as a UNESCO International Biosphere Reserve in 1976.  The park has a reputation for being dangerous, which it can be for NPS Law Enforcement due to its border location, but tourists should encounter no problems while enjoying the beautiful landscape.



Ajo Mountain Loop, Alamo Canyon, birding, earn an “I Hike For Health” pin

Must-Do Activity

The namesake cactus is more common further south and shares this landscape with 27 other species of cacti, including the famous saguaro.  To see the cacti at their best, I recommend driving the 21-mile dirt road Ajo Mountain Loop in the evening before turning in for the night at the campground.

Best Trail

The National Park Service (NPS) runs a shuttle some mornings to Senita Basin from where you can hike back to the visitor center (with an optional side trip to the abandoned Victoria Mine).

Instagram-worthy Photo

The park’s Ajo Mountains are mostly volcanic rhyolite and their jagged outlines photograph well in the twilight hours with the famous saguaro cactus silhouetted in the foreground.

Saguaros and Diaz Peak

Peak Season

Anytime but summer when temperatures regularly soar above 100°F.



$25 per vehicle or America the Beautiful pass

Road Conditions

The highway is paved to Kris Eggle Visitor Center and Twin Peaks Campground, but most of the dirt roads are passable for all vehicles.


The park has the very nice Twin Peaks Campground (with solar showers) where you can pick up free hiker shuttles that allow for one-way trips back to your tent.  There are also a couple dry campsites (permit required) on Alamo Canyon Road.  A permit is required for backcountry camping.

Related Sites

Coronado National Memorial (Arizona)

Saguaro National Park (Arizona)

Tumacácori National Historical Park (Arizona)

Lots of organ pipes
Organ pipe cacti
A cristate formation on an organ pipe
An organ pipe cactus with a unique cristate formation.
Sunset on the Green Desert
Estes Canyon
We saw unique bird species like this phainopepla, in addition to Scott’s orioles, Gila woodpeckers, black-throated sparrows, and, of course, ravens.
The border wall under construction in January 2020
It is a steep 2-hour long scramble up to this arch
Raven about the park in the Sonoran Desert

Explore More – Why is the Visitor Center named for Park Ranger Kris Eggle?



Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s