Fifield Ranch is a locale within the Diablo Range in Santa Clara County, California. It lies at an elevation of 1,512 feet (461 meters), west of the head of Romero Creek and the Santa Clara County line, about a mile north of Hagerman Peak. It is at the source of a tributary canyon and stream to Chimney Gulch, itself a tributary of East Fork Pacheco Creek.[1][2][3]