Retired after his four-year-old racing season in 1946, Royal Charger was sold to the Irish National Stud for £52,000. There, he sired a number of important horses before being purchased in 1953 by American George D. Widener, Jr., who brought him to stand at his Old Kenney Farm (now Green Gates Farm) in Lexington, Kentucky. A three-quarters brother to the important sire Nasrullah, which also was brought to Kentucky from England, Royal Charger sired more than 55 stakes winners. Among his Irish progeny was Turn-To, which also was sent to the U.S., where he was the leading juvenile sire in 1958, notably through his colt First Landing. Other offspring included: