The United States Congress designated the Trigo Mountain Wilderness (map
) in 1990 and it now has a total of 30,300 acres
All of this wilderness is located in Arizona
and is managed by the Bureau of Land Management.
The Trigo Mountain Wilderness is bordered by
the Imperial Refuge Wilderness
to the west.
You're practically in another state in Trigo Mountains Wilderness; the Golden State to be precise. Only a thin strip of Imperial National Wildlife Refuge along the lower Colorado River separates this Wilderness from California. The Yuma Military Proving Ground lies to the east. A road divides the area into northern and southern sections. Here you'll find 14 miles of the Trigo Mountain ridgeline cut by Red Cloud Wash in the south, Clip Wash in the center, and Hart Mine Wash in the north. Elevations range from about 300 to 1,700 feet. Numerous washes further dissect the area's sawtoothed ridges. Water often seeps to the surface in several springs. Folks set off on extended horsepacking and backpacking trips along the washes, and rock climbers scale the Trigo Mountains. The Colorado River supports diverse wildlife, including bighorn sheep, mule deer, gray foxes, coyotes, and ring-tailed cats, and typical Sonoran Desert vegetation covers the area. Year-round temperatures range from the low 50s to mid-90s and less than 5 inches of rain falls, annually.