Nature Reserve
Organ Pipe Cactus National Monument in southern Arizona is a sprawling 517-square-mile desert preserve and UNESCO biosphere reserve known for protecting the northernmost natural habitat of the rare organ pipe cactus.
Established in 1937, the monument features rugged Sonoran Desert landscapes including mountains, valleys, and washes, and is home to over 2,000 plant species such as saguaros, ocotillos, and rare cacti, alongside diverse wildlife including desert bighorn sheep, coyotes, and more than 250 bird species.
Nearly 95% of the monument is designated wilderness, offering opportunities for hiking, scenic drives, camping, and stargazing under some of the darkest night skies in the U.S. The area also holds cultural significance for Indigenous peoples like the Tohono O’odham.
With trails of varying difficulty, visitors can explore natural beauty, historic mining sites, and the critical desert ecosystem that thrives despite extreme heat and scarce water.
| Established | 13 April 1937 |
| Management | National Park Service |
| Phone | +1 520-387-6849 |
| Area | 330,688 acres (1,338.25 km2) |
| Nearest City | Ajo, Arizona |
| Address | 10 Organ Pipe Dr, Ajo, AZ 85321, United States |
Organ Pipe Cactus National Monument is located in Arizona, United States.
Organ Pipe Cactus National Monument is situated in the state of Arizona.
The main phone number for the Organ Pipe Cactus National Monument is +1 520-387-6849.
The address of Organ Pipe Cactus National Monument is 10 Organ Pipe Dr, Ajo, AZ 85321, United States.
Yes, Organ Pipe Cactus National Monument is family-friendly and attracts visitors of all age groups.
Visitors usually spend a few hours to a full day exploring Organ Pipe Cactus National Monument.
Yes, there are several hotels and accommodations near Organ Pipe Cactus National Monument in Arizona.
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