The British Classics: the five races that define a generation

What are the five British Classics and where are they run?

The Guineas are run over a mile at Newmarket in May, the Derby and the Oaks over a mile and a half at Epsom in June, and the St Leger over about a mile and six and a half furlongs at Doncaster in September.

The 2000 Guineas, the Derby and the St Leger are open to colts and fillies, although colts dominate them. The 1000 Guineas and the Oaks are for fillies only. Fillies running in the open races receive a weight allowance, and in the Derby colts carry 9st 2lb while fillies receive a 3lb allowance.

Together the five races test speed, middle-distance class and stamina, which is why they are prized by breeders. A Guineas winner is a proven top-class miler, a Derby or Oaks winner a proven mile-and-a-half horse, and a St Leger winner a stayer.

Why are the Classics only for three-year-olds?

The Classics were created to identify the best horses of each generation at the age when they are old enough to show their ability but still ahead of their stud careers, so every runner meets rivals of exactly the same official age.

Racing against their own age group removes the need for weight-for-age allowances, so a Classic is a straight test between the best horses born in the same year. That makes the result a clean guide for breeders, who use Classic winners and placed horses as the benchmark for stallions and broodmares. It also gives each Classic a once-in-a-lifetime quality: a horse gets one chance to win each race.

Which is the oldest British Classic?

The St Leger is the oldest British Classic, first run at Doncaster in 1776 and named after Anthony St Leger, the army officer who devised it.

The Oaks followed at Epsom in 1779 and the Derby in 1780, both founded by the 12th Earl of Derby and his circle. The 2000 Guineas was first run in 1809 and the 1000 Guineas in 1814. Five races founded within four decades still form the backbone of the British Flat season, and their names have been borrowed by Classics around the world, from the Kentucky Derby to the Irish and French Guineas.

Can a gelding run in a Classic?

No. Geldings cannot run in the British Classics, because the races exist to identify future breeding stock and a gelding can never go to stud.

The rule sometimes keeps good horses out. A colt that is gelded as a two-year-old to settle his temperament loses his Classic eligibility, even if he turns out to be top class. Geldings can still run in almost every other top race, including most Group 1 races for older horses, and some of the best sprinters and stayers of recent years have been geldings.

How do the Irish Classics differ from the British ones?

Ireland runs its own set of five Classics, all at the Curragh: the Irish 2000 Guineas and 1000 Guineas in May, the Irish Derby in late June or early July, the Irish Oaks in July and the Irish St Leger in September.

The main difference is the Irish St Leger, which has been open to older horses since 1983, so it is no longer a race for three-year-olds only. The Irish Guineas come three weeks or so after Newmarket, and the Irish Derby often attracts the Epsom winner or placed horses, giving a second chance to compare the same generation. The Curragh is a wide, galloping track, a very different test from Epsom's gradients and camber.

What are the Classic trials?

Classic trials are the spring races that serve as stepping stones to the Guineas, the Derby and the Oaks, where trainers test their three-year-olds and the ante-post markets take shape.

The Guineas trials come in April at Newmarket's Craven meeting and at Newbury's Greenham meeting, and the Derby and Oaks trials follow in May at courses such as Chester, York and Leopardstown. A horse's two-year-old form is often the starting point, but the trials show who has trained on over the winter and who is ready for a longer trip.

Trials are rarely run flat out, so the bare result can mislead. The pace, the ground and whether the horse was having its first run of the season all matter, and a horse beaten in a trial can still win the Classic itself.

How often do favourites win the Classics?

Favourites win a large share of Group 1 races because the best horses are usually well known by the time they reach that level, but Classics can still be upset, especially when the ground or the trip is new to the market leader.

The Group 1 roll of honour on this page updates after every racing day. In 2026, favourites have won 23 of the 45 British and Irish Group 1 races run so far, and Aidan O'Brien leads the trainers with 15 Group 1 wins. Classics are special cases within that group: three-year-olds are still improving, many are running over a new trip, and the first Classics come early in the season when form is thin.

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