When and in which state did Alateen groups begin? Alateen groups were started in September of 1957, in Pasadena, California Simeon 2017-11-09T16:23:31+00:00 November 9, 2017| Share This Post, Choose Your Platform! FacebookTwitterEmail Leave A Comment Cancel reply Comment Save my name, email, and website in this browser for the next time I comment. This site uses Akismet to reduce spam. Learn how your comment data is processed.