Bred at August Belmont, Jr.'s Haras de Villers in Foucarmont in Upper Normandy, France, he was foaled in England.

Triple Crown series had yet been formalized and Hourless did not run in the Kentucky Derby or the Preakness Stakes, which were held on the same day.

After the other entrants were scratched, the October 18, 1917 John R. McLean Memorial Championship at Laurel Park Racecourse in Maryland turned into a match race between Hourless and Wilfrid Viau's Kentucky Derby winner, Omar Khayyam.

This time, however, Hourless won by a length[4] He retrospectively was named 1917 American Champion Three-Year-Old Male Horse, jointly with Omar Khayyam.

Retired to stud, Hourless sired Mike Hall, 1928 American Champion Older Male Horse and Charley O., winner of the 1930 Florida Derby.