In 1178, the castle of Rocha Forcha was built by the bishops of Die as a stronghold against the Holy Roman Emperors. It belonged to French lords until the year 1766 when the last one, Lord Rey de Noinville, died. In 1796, a French trader, Pierre Jossaud bought the land surrounding the castle and renamed it Rochefourchat. The commune has been passed down through Jossaud's family.
The permanent population of Rochefourchat consists of one woman; yet Rochefourchat is not the least populous French commune, as there are six communes with no inhabitants, destroyed and abandoned during World War I but maintained as administrative subdivisions to preserve their memory.