Cavalor Trainer of the Quarter - Joseph O’Brien

Limestone (4) with Dylan Browne McMonagle up wins the 2026 Queen’s Vase at Royal Ascot.

Joseph O’Brien has enjoyed remarkable contrasting successes so far this year, his hurdler Home By The Sea winning the Gr.1 Stayers Hurdle at Cheltenham back in March, the filly Thundering On landing the Gp.1 Oaks at Epsom, followed by five winners at Royal Ascot to see O’Brien challenging his father Aidan for the meeting’s coveted Leading Trainer award. At time of going to press the Irish Derby has yet to be run, but there is a strong chance James J Braddock has capped a month to remember for the Carriganóg team.

O’Brien’s stable Carriganóg is set within the picturesque Owning Hill near Piltown in County Kilkenny and is steeped in family history. His grandfather Joe Crowley was the first to train there, and parents Annemarie and Aidan both won Irish Champion National Hunt Trainer titles from there, while O’Brien’s aunt, Frances Crowley, added to the list of winners sent out from the renowned yard. 

Carriganóg is famed for its uphill gallop, a 1400m (7f) woodchip gallop, six metres wide and rising over 80 metres from start to finish, the effects of which are seen to good effect within the impressive physique of O’Brien’s runners. But other substantial improvements have made Carriganóg a world-class training facility, with extensive grass and all-weather schooling facilities for Flat and National Hunt horses including racecourse-standard hurdles and fences. The horses also enjoy occasional away trips to school and gallop at racecourses.

Green Carrera (Sandringham Stakes Handicap), Enceladus (King George V Stakes Heritage Handicap), King Of Cloughan (Windsor Castle Stakes), Limestone (Queen’s Vase) and Kizlyar leading home Defiantly in a stable one-two (Ascot Stakes Heritage Handicap), not to mention Johanna Walsh’s narrow defeat in the Ribblesdale Stakes, is an illustration of the depth of O’Brien’s team.

Kizlyar (farside) leads home Defiantly in a stable one-two in the 2026 Ascot Stakes Heritage Handicap.

“We’re lucky in having the support of really good owners, and we have a very good team of people on the track as well as at home,” reflects O’Brien, who didn’t go into the meeting as a military campaign, but instead treats each horse as an individual and plans their programme accordingly. 

“They’ve all had a normal preparation, my job is to maximise a horse’s potential and tailor their race programme for their owner’s needs and ambitions. Some owners might want to have a runner on the big day, or at their local track, others might like to travel, but firstly it’s the horse. We look at the horse’s needs first and then the ownership, and my job is to plan and execute.”

Running a dual-purpose yard doesn’t mean O’Brien takes a different approach to any other leading trainer. “Every horse is treated individually,” he points out. “The National Hunt horses have slightly different training programmes to the Flat horses, but every horse is an individual and treated differently; figuring out what’s suitable for each horse is key to getting the best out of them.”

In a year that has already secured a Grade One Cheltenham Festival winner, an Epsom Classic winner and now five Royal Ascot winners, there is no doubt that O’Brien has that key well figured out.