The oldest traces of settlements near Krauchthal are neolithic flints which were discovered in Mooshubel and Buech. The wooden posts of a Roman settlement were found on the Thornberg along the remains of a Roman manor on the north side of the valley. During the Middle Ages there were three castles or fortifications, Thorberg Castle, Liebenfels-Sodfluh Castle and the high medieval fortification of Tannstigli, within sight of each other in the modern borders of the municipality. Between 1175 and 1397 Thorberg Castle was home to the Lords of Thorberg. After the death of Peter von Thorberg, in 1397, he left his many estates to the Carthusians who converted the castle into a monastery or chapterhouse. The Carthusians became the largest land holders in Krauchthal. The Krauchthal village church of St. Mauritius was first mentioned in 1270.