Tuleyome was founded in 2002 as a volunteer advocacy-oriented nonprofit organization that is focused on protecting both the wild and agricultural heritages of the Inner Coastal Range and the Western Sacramento Valley for current and future generations. These areas include all or parts of Yolo, Lake, Napa, Colusa, Glen, Mendocino and Solano counties in northwestern California. Tuleyome has worked on spearheading formal Wild and Scenic Designation for upper Cache Creek; working to designate and manage the Cedar Roughs and Cache Creek Wildereness Areas; and to establish the permanent protection of the Beryessa Region in Central California.