Tassajara may refer to: Tassajara, California, in Contra Costa County Tassajara Formation Tassajara Hot Springs Tassajara Zen Mountain Center Tassajara - mountain bike design by Gary Fisher Tassajara Cellars - winery in Paso Robles, California Tassajara Creek (Arroyo Seco River) - tributary of the Arroyo Seco River (Monterey County), in the Ventana Wilderness Tassajara Creek - creek in the Morgan Territory Regional Preserve in Alameda County, California Tassajara Mountain or Mount Tassajara - peak in the Santa Lucia Mountains