Does the Jockey Really Matter? What I Learned After a Rider Change

Last updated: October 14, 2026

By: Miles HenryFact Checked

How important is the jockey in horse racing? Maybe your horse ran flat last time and the trainer wants to try a different rider. Or you’re handicapping a race, you see a horse switching jockeys, and you’re wondering whether that’s worth a second look or just noise.

Here’s where a jockey’s influence actually shows up, what happens when the same horse gets a different rider, and what separates the good riders from the rest.

How Important Is the Jockey in Horse Racing?

A jockey’s influence shows up in four places, and any one of them can change the result:

None of that shows up in the pedigree or the works. That’s why the same horse can look like two different animals from one race to the next. Those decisions sit on top of the routine side of what a jockey does on race day, like weighing out, checking tack, and reporting to the trainer afterward.

Jockey vs. Horse: Which Matters More?

Racing people have never agreed on exactly how much credit the jockey deserves. In 1956, Sports Illustrated asked a group of them how important a jockey is to a horse, and the answers were all over the map. Hall of Fame trainer Max Hirsch said the jockey amounts to about 25 percent of the race, “but no more.” Stockbroker John V. Bouvier III went the other way, saying a good jockey is worth about 75 percent in the average race. Trainer Belmont Evans put it at about 5 percent “after the trainer is through with him.”

Those were opinions, not measurements, and nobody’s ever proven any of them. But in my experience, it works like this: a good jockey on a bad horse still loses. A bad jockey on a good horse can still win, just not as often as the horse deserves. The horse decides what’s possible, and the jockey decides how much of it gets used on a given day.

Where a jockey costs you is in the mistakes: sitting behind a wall of horses with nowhere to go, asking for run three lengths too early, or letting a front-runner get away cheap. Post position shapes a lot of those early decisions, too, since where a horse breaks from often decides how much room the rider has in the first quarter-mile.

Same Horse, Different Jockey: What Changes?

The cleanest way to see what a jockey adds is to watch the same horse, in the same kind of race, with a different rider. I got a clear look at that this spring.

One race doesn’t prove a rule. Horses improve and regress for plenty of reasons, from fitness to the pace of the race to how they’re feeling that day. But when a horse jumps forward right after a rider change and not much else has changed, the rider is the first place I’d look.

If you’re handicapping, a rider change is worth noting, but it isn’t a signal on its own. Look at whether it’s a clear upgrade, whether the new rider has won with this trainer before, and whether an apprentice’s weight allowance comes into play. The change matters most when the new rider has a clear edge for that horse, like knowing it needs to be covered up, sent early, or kept out of a speed duel. It also helps to understand how jockeys choose which horses they ride, since the best riders and their agents tend to pick live mounts.

What Makes One Jockey Better Than Another?

Fitness, strength, and balance are the starting point for every rider. What separates the better ones is judgment: reading the pace, understanding the horse, and knowing when to move. Many of the best jockeys grew up around horses, often as the children of trainers and owners, and spent years around a barn before they ever rode a race.

• Reading the race: Good riders see the shape forming before it happens. They know who’s going to the lead, who’s likely to back up, and where the holes will open.
• Knowing the horse: They figure out whether a horse needs to be rated or sent, whether it lugs in, and how it takes pressure, and they ride it that way.
• Using the tools: Hands, legs, and balance do most of the work. A good rider also knows when a whip is warranted and when it isn’t.
• Staying calm: Races don’t go to plan. The best ones adjust when the pace collapses or a hole closes, without panicking or giving up on the horse.

Gender alone isn’t a good measure of a jockey’s ability, either. A University of Nottingham study of more than 52,000 race results found that male and female jockeys had similar chances of finishing in the top three. The rider’s judgment, timing, and ability to get the best out of a horse matter more, and a lot of that shows up in how jockeys get more speed out of a horse without wasting its energy.

Can a Horse Win Without a Jockey?

Not in sanctioned Thoroughbred racing in North America. A horse has to carry its rider for the whole race to be counted as a finisher. The best-known recent example is Bodexpress in the 2019 Preakness. He lost John Velazquez at the start and ran the whole race riderless, but he’s listed in the official results as “did not finish.”

The Palio di Siena, the centuries-old bareback race around the main square in Siena, Italy, is the famous exception, since a horse can win there even after losing its rider. In harness racing, the driver sits in a sulky behind the horse instead of on its back.

So yes, the jockey matters, sometimes enough to turn a sixth-place finish into a win. But don’t overreact to one rider change. The horse still has to have the ability, and the right rider just gives it a better chance to show it.

Miles Henry

About Miles Henry

Racehorse Owner & Author | 30+ Years in Thoroughbred Racing

Miles Henry (legal name: William Bradley) is a professional horseman based in Folsom, Louisiana. He holds Louisiana Racing License #67012 and has spent over three decades managing Thoroughbreds at premier tracks including Fair Grounds, Delta Downs, and Evangeline Downs.
Expertise & Hands-On Experience: Beyond the track, Miles has decades of experience in specialized equine care, covering everything from hoof health and nutrition to training protocols for Quarter Horses, Friesians, and Paints. Every guide on Horse Racing Sense is rooted in this “boots-on-the-ground” perspective.
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