On The day that it was born or if you don't know then check with your ventenarian
August 1st for the Southern Hemisphere and January 1st for the Northern Hemisphere
Race for "three year-olds". However, Thoroughbreds that are born in the Northern Hemisphere technically become a year older on January 1 each year and those born in the Southern Hemisphere turn one year older on August 1.
january 1st and august 1st are the two dates
Thoroughbreds, 3 years old and older
No. Only three year old thoroughbreds can enter the derby, so they can only enter once.
Nursery
The official birthday of all Thoroughbred racehorses is January 1st, regardless of the date of the horse's actual birth. This is so that there is a definite deadline for horses entered in races specifically for 2 or 3 year olds.
Nursery
Nursery
The Cesarewitch is a flat horse race in Great Britain open to thoroughbreds 3 years or older.
Races for 3 year old thoroughbreds are restricted by entry conditions "for 3 year olds". The Triple Crown (Kentucky Derby, Preakness, and Belmont) are the most commonly known races for 3 year olds.
You can find Thoroughbreds on grass.