Almo is a very small unincorporated community in Cassia County, Idaho, United States. It is a short distance away from the City of Rocks National Reserve, a 14,300-acre area with granite columns as much as 600 feet high.Almo is part of the Burley, Idaho Micropolitan Statistical Area.Many pioneers followed the Oregon Trail west in the middle of the 19th century, and passed by the future site of Almo. Several of these pioneers wrote letters home describing their encounters with Native Americans. Although these accounts tended to be exaggerated by participants, there is historical evidence of several small incidents that took place from 1860-1862.However, Almo's most famous historical event, the Almo Massacre of 1861, has been viewed with skepticism in recent years. In 1938, the Sons and Daughters of Idaho Pioneers paid for and erected a marker in remembrance of the massacre, in which a wagon train of nearly 300 pioneers were surrounded and slaughtered by Indians.