Stud career
Leamington sired 19 winners of 42 races while at Rawcliffe. He was then purchased by the Canadian Roderick W. Cameron for £1,575, and stood at General Abe Buford's Bosque Bonita Stud near Versailles, Kentucky for the 1866 season. He bred only thirteen mares, but produced an outstanding crop of foals, including Longfellow, Enquirer, Lyttleton, Lynchburg, Anna Mace, and Miss Alice.
Cameron then sent the stallion to his own Clifton Stud on Staten Island. He was then moved to New Jersey in 1868, before being shipped to Annieswood Farm in 1871. His offspring were now noted for their speed and included Aristides, the winner of the first Kentucky Derby.
Leamington was sold to Aristides Welch, who stood the stallion at his Erdenheim Stud, near Philadelphia, Pennsylvania. Leamington finished his life here, dying on May 6, 1878, at the age of 25. During his breeding career, he was the leading sire in North America four times, including leading Lexington in 1875 for the first time in 16 years. He also earned this title in 1877, 1879, and 1881.
Horses sired by Leamington included:
Aristides (1872) won the first Kentucky Derby and Withers Stakes
Harold (1876) won 1879 Preakness Stakes
Iroquois (1878) the first American horse to win Epsom Derby and GB St. Leger Stakes
Eolus (1868), sire of Knight of Ellerslie (1881), winner of the 1884 Preakness Stakes
Longfellow (1867) a great sire himself
Parole (1873) one of the three greatest runners in the 1870s
Saunterer, won Belmont Stakes and Preakness Stakes