Along with several other conservation groups, ONDA succeeded in removing livestock grazing from Hart Mountain National Antelope Refuge in 1992. Since then, the refuge has rebounded to a lush, vibrant native grassland.  The 278,000-acre refuge is one of the largest habitats in the arid West that is not grazed by domestic livestock. 

ONDA has also turned back repeated attempts by the U.S. Fish and Wildlife Service to reintroduce lethal predator control on the Refuge, and we are currently developing a conservation proposal to combine Hart Mountain with Nevada's Sheldon Wildlife Refuge and further protect precious habitat for greater sage-grouse.

Hart Mountain National Antelope Refuge covers over 251,000 acres and is home to more than 300 species of wildlife, including pronghorn antelope, bighorn sheep, sage-grouse, and mountain quail. The refuge was designated in 1936 by Franklin D. Roosevelt as a range and breeding ground for pronghorn, but management has since grown to include conservation of a wide variety of wildlife and the restoration of native ecosystems found within the refuge.  Hart Mountain is a massive fault block ridge, which rises high above the Warner Valley and is carved out by a series of spectacular gorges.