In 1945 Koenig-Warthausen returned to a family estate at Sommershausen, near Biberach, where he farmed and was a member of several organisations promoting local agriculture. He sold the estate in 1973 and retired to a house overlooking Lake Maggiore, in the village of Brezzo di Bedero, Italy.
In 1945 Koenig-Warthausen returned to his family's farm at Sommershausen near Biberach, where he engaged in farming and was involved in local agricultural organizations. He sold the estate in 1973 and retired to a house overlooking Lake Maggiore in Brezzo di Bedero, Italy.