These Kairos retreats began at the Jesuit Retreat House near Cleveland, Ohio, which is affiliated with John Carroll University and several high schools around the area. After several Jesuit high schools schools in Ohio adopted the tradition, non-Jesuit Catholic high schools throughout the United States, Australia, Canada, the United Kingdom, and Puerto Rico began to participate. More recently, efforts have been made to establish a Kairos tradition in mainland Europe, starting in Geneva, Switzerland.