During Creamer's amateur career, she won 19 national tournaments, including 11 American Junior Golf Association events, and was named Player of the Year by the AJGA in 2003. On two occasions (2002 and 2003), Creamer played on the United States team in the Junior Solheim Cup. She was a semi-finalist in the 2003 U.S. Girls' Junior and U.S. Women's Amateur, and reached the same stage of both events the following year. In June 2004 Creamer placed second in the LPGA Tour's ShopRite LPGA Classic, finishing one stroke behind Cristie Kerr. Later that year she tied for 13th in the U.S. Women's Open and represented the United States in the Curtis Cup.