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Trigo Mountain Wilderness

General Location Maps Contacts Area Management Wilderness Laws Trip Planning


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.

Planning to Visit the Trigo Mountain Wilderness?

Leave No Trace

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 in the Trigo Mountain Wilderness.
  1. Plan Ahead and Prepare
  2. Travel and Camp on Durable Surfaces
  3. Dispose of Waste Properly
  4. Leave What You Find
  5. Minimize Campfire Impacts
  6. Respect Wildlife
  7. Be Considerate of Other Visitors
For more information on Leave No Trace, Visit the Leave No Trace, Inc. website.