Altamont is an unincorporated community in Alameda County, California. It is located northeast of Livermore, at an elevation of in the Altamont Pass. It was in 1969 the site of the Altamont Free Concert at the Altamont Speedway. Originally called The Summit, the name was changed to Altamont when the Central Pacific Railroad arrived in 1869. History Altamont is derived from its former name Alta Monte (Spanish for "High Mountain"). The community was also briefly known as The Summit. A post office operated at Altamont from 1872 to 1955. References Unincorporated communities in California Unincorporated communities in Alameda County, California