As a juvenile, Birdstone won the Champagne Stakes, a leading race for two-year-olds, at Belmont Park in 2003. Beginning his sophomore season, Birdstone won an allowance and finished fifth in the Lane's End Stakes. He was not a factor in the first two Triple Crown races and was a 36-1 longshot when he upset the overwhelmingly favored Smarty Jones, taking the lead in the final furlong in the fastest Belmont Stakes since the advent of modern electronic timing. Birdstone's victory represented the first in the Belmont for trainer Nick Zito, whose horses had finished second in that classic five times. In the winner's circle after the Belmont Stakes, his owners apologized to the connections of Smarty Jones for winning, as did jockey Edgar Prado. The next major race for Birdstone was the Travers Stakes, which he won being the fourth betting choice at 5-1. He was Zito's first Travers champion.
Retirement and Stud Career
Birdstone's retirement from racing after suffering a bone chip at the Breeders' Cup was announced on November 4, 2004. He began his career as a stallion at Gainesway Farm in Lexington, Kentucky. His first starter was the colt Shoe Strap, who first went to post on May 21, 2008, at Churchill Downs and was trained by D. Wayne Lukas. From his first crop of foals to race, Birdstone sired Mine That Bird, who had several wins as a two-year-old gelding before winning the 2009 Kentucky Derby as a three-year-old. Another of Birdstone's top runners was Summer Bird, who upset Mine That Bird in the 2009 Belmont Stakes. His first crop also included Birdrun, who set the Belmont track record at a mile and a sixteenth . Birdstone was one of the top ten ranked freshman sires of 2008 with 11 winners out of 22 starters and stood for $10,000 for the remainder of the 2009 season, despite his first-crop success. His 2010 stud fee was posted as $30,000 but by 2017 it had fallen to $5,000. Birdstone has sired 30 black-type runners, 19 stakes winners, 8 graded stakes winners, and has amassed progeny earnings over $21 million. Birdstone's most notable progeny includes:
Summer Bird: Won Belmont Stakes, Travers Stakes, Jockey Club Gold Cup, 2009 Eclipse Champion 3 Year Old Colt.