The Runhappy Stakes is a Grade III American Thoroughbred horse race for four years old or older at a distance of six furlongs on the dirt run annually in early May at Belmont Park in Elmont, New York.
The event was inaugurated on 14 May 2014 as the Diablo Stakes and was won by the favorite Sensational Slam who defeated four other runners over 6 furlongs (Approx.
[4] The event was upgraded to Grade III in 2020[5] but was not held due to the COVID-19 pandemic in the United States.
Belmont Park ran a shortened meeting and the event was cancelled in favor of the rescheduled Carter Handicap being moved from Aqueduct Racetrack.
[6] In 2024 the event was moved to Aqueduct Racetrack due to infield tunnel and redevelopment work at Belmont Park.