That year he turned to training horses, making his way to the modern new racetracks being built in California where he enjoyed considerable success.
During his career, Molter trained for prominent owners such as Elizabeth Arden, Andrew J. Crevolin, Travis M. Kerr, and film mogul, Louis B. Mayer.
Among the horses Molter trained were 1947 Santa Anita Derby winner, On Trust, 1956 Santa Anita Handicap winner Bobby Brocato, and Imbros, who set a new world record of 1:20.60 for 7 furlongs in winning the 1954 Malibu Sequet Stakes.
In addition, Molter won the 1954 Kentucky Derby with Determine but his most famous horse was 1958 American Horse of the Year and Hall of Fame inductee, Round Table who retired at the end of the 1959 racing season having earned a world record US$1,749,869.
That year, the United States' National Museum of Racing inducted him in their Hall of Fame.