<P> On June 9 , 1973 , Secretariat won the Belmont Stakes by thirty - one lengths in a record time of 2 : 24 , becoming a Triple Crown champion , ending a 25 - year gap between Citation , the Belmont and Triple Crown winner in 1948 . Secretariat 's record still stands as the fastest running of the Belmont Stakes and an American record for 11⁄2 miles on the dirt . In 1977 , Seattle Slew became the first horse to win the Triple Crown while undefeated . Affirmed was the last winner of the Triple Crown in the 20th century , taking the Belmont Stakes in 2 : 26 4 / 5 on June 10 , 1978 . Ridden by eighteen - year - old Steve Cauthen , Affirmed defeated rival Alydar with Jorge Velasquez in the saddle . At the time the race was the third - slowest start and the third - fastest finish with the quarter in 25 , the half in 50 , 3 / 4 in 1 : 14 , the mile in 1 : 37 2 / 5 . </P>
<P> On June 9 , 1973 , Secretariat won the Belmont Stakes by thirty - one lengths in a record time of 2 : 24 , becoming a Triple Crown champion , ending a 25 - year gap between Citation , the Belmont and Triple Crown winner in 1948 . Secretariat 's record still stands as the fastest running of the Belmont Stakes and an American record for 11⁄2 miles on the dirt . In 1977 , Seattle Slew became the first horse to win the Triple Crown while undefeated . Affirmed was the last winner of the Triple Crown in the 20th century , taking the Belmont Stakes in 2 : 26 4 / 5 on June 10 , 1978 . Ridden by eighteen - year - old Steve Cauthen , Affirmed defeated rival Alydar with Jorge Velasquez in the saddle . At the time the race was the third - slowest start and the third - fastest finish with the quarter in 25 , the half in 50 , 3 / 4 in 1 : 14 , the mile in 1 : 37 2 / 5 . </P>
what is the fastest time at the belmont stakes
what is the fastest time at the belmont stakes
2 : 24
2 : 24