A hurdle race is a race with a number of timber obstacles, called hurdles. These hurdles are usually light, movable, and lower than steeplechasing fences. The minimum height is 107 cm or 3'6". Commonly, hurdle races are seen as a kind of preparation for steeple chase races.
According to the British Horseracing Authority, hurdle races are divided as follows, depending on the age, experience, and distance run by the horse.
2 mile (around 3.21 km) Juvenile
2 mile (around 3.21 km) Novice
2 mile (around 3.21 km) Open
2½ mile (around 3.38 km) Novice
2½ mile (around 3.38 km) Open
3+ mile (around 4.8 km) Novice
3+ mile (around 4.8 km) Open
*Juvenile races are only open to 3 year old horses (October – December)or 4 year old horses (January – April)
* Novice races are open to horses, which at the beginning of the Jumps season, still have to win a race
* Open races are open to all horses