2 Ecotypes - 8 Covered Species
Shortgrass species assemblage:
Sagebrush obligate assemblage:
The Thunder Basin Grasslands Prairie Ecosystem Association coverage area spans 10.8 million acres across Campbell, Converse, Crook, Niobrara, and Weston counties in northeastern Wyoming.
Current members of the Association own over 450,000 acres of land within this mixed ownership landscape. Other lands include Thunder Basin National Grasslands administered by the USDA Forest Service through three local grazing associations, Bureau of Land Management lands, state lands, and additional private lands not currently in the membership of the Association.