The Trigo Mountain Wilderness (30,300 acres) in Arizona, is managed by the Bureau of Land Management. In 1990, the Trigo Mountain Wilderness became part of the now over 109 million acre National Wilderness Preservation System established by the Wilderness Act of 1964. In wilderness, you can enjoy challenging recreational activities and extraordinary opportunities for solitude. Please follow the regulations in place for this area, and use Leave No Trace techniques when visiting to ensure protection of its unique natural and experiential qualities. How to follow the seven standard Leave No Trace principles differs in different parts of the country (desert vs. Rocky Mountains). Click on any of the principles listed below to learn more about how they apply. Motorized equipment and equipment used for mechanical transport are generally prohibited on all federal lands designated as wilderness. This includes the use of motor vehicles (including OHVs), motorboats, bicycles, hang gliders, wagons, carts, portage wheels, and the landing of aircraft including helicopters Contact the agency for more information about regulations. The summer climate in this wilderness unit is harsh. Daytime temperatures during the summer months are over 100 degrees. Temperatures are more moderate between October 1 and April 30th. The terrain in Tres Alamos Wilderness is extremely rugged. A few old vehicle ways provide hiking routes in some places, but the most commonly used routes are the sand washes which dissect the area. Burro trails can sometimes be located and followed on uplands. No formal hiking trails exist in this wilderness unit. Water is relatively scarce in this wilderness. Springs shown on topographic maps can generally be relied upon for drinking water, but a call to the BLM office to confirm this would be prudent. Purification of all water is a necessity. Some lands around and within the wilderness are not federally administered. Please respect the property rights of the owners and do not cross or use these lands without their permission.

The Trigo Mountains Wilderness is located about 25 miles north of Yuma, Arizona, in La Paz County.

From Yuma, travel north along Highway 95 to the Martinez Lake Road. Travel west on Martinez Lake Road to the Imperial National Wildlife Refuge. Travel northwest on Red Cloud Mine Road to Red Cloud Wash. Roads near the wilderness include Cibola Road, Hart Mine Wash Road, and Lopez Wash Road. High-clearance or four-wheel-drive vehicles are recommended for access to the wilderness boundary.