Last updated: April 16, 2026
Yes — Secretariat was the fastest horse to ever race. Three reasons stand above all others:
- He set records in all three Triple Crown races in 1973 — records that still stand more than 50 years later
- His Belmont Stakes time of 2:24 flat for 1½ miles has never been approached by any horse in the race’s history
- His heart weighed an estimated 22 pounds — nearly three times the average — giving him cardiovascular capacity no other racehorse has matched
The debate about the “greatest” racehorse involves era comparisons and conditions. At classic race distances, the clock makes the case clearer than any argument — and the clock has Secretariat by a margin nothing else has touched.
What Does “Fastest Horse to Ever Race” Actually Mean?
Before examining the evidence, the definition matters — because “fastest horse” means different things depending on how you measure it. There are three distinct categories, and Secretariat dominates the one that actually applies to this question.
Top speed in a short burst — This is raw peak mph over a very short distance. Quarter Horses and specialized speed horses can reach 43-55 mph in two-furlong trials. Winning Brew holds the Guinness record at ~43.97 mph over two furlongs. These are essentially timed sprints, not races in any traditional sense, and they have no bearing on Secretariat’s claim.
Sustained speed over race distance — This is what “fastest horse to race” actually means: the highest average speed maintained over a classic race distance (a mile or longer) under genuine race conditions. This is Secretariat’s category, and nothing in racing history touches what he did at the Belmont distance.
World record for the mile — Dr. Fager set the world record for the mile in 1968, running 1:32.1 at Arlington Park carrying 134 pounds — one of the most extraordinary performances in racing history. If the question were “who was the fastest horse at a mile,” Dr. Fager is in the conversation. At a mile and a half, it’s Secretariat, and it isn’t close.
I’ve stood at the rail at Fair Grounds, Delta Downs, and Evangeline Downs for more than 30 years watching Thoroughbreds run. I’ve owned racehorses, breezed two-year-olds at dawn, and spent more hours than I can count studying pace figures and speed ratings. When people ask me whether Secretariat was really the fastest horse to ever race, I don’t hedge. The answer is yes — and I’ll show you exactly why the numbers make the case better than any argument can.
What makes Secretariat’s case unique isn’t just that he ran fast. It’s that he ran faster as a race got longer. His Kentucky Derby splits were faster in each successive quarter-mile. His Belmont was faster than his Preakness. He didn’t tire — he accelerated. In 30 years of watching horses run, I’ve never seen anything close to that pattern replicated at any level of competition.
Table of Contents
Secretariat’s Early Years: Pedigree and Development
Secretariat was foaled on March 30, 1970, at Meadow Stud in Virginia. His sire was Bold Ruler — a dominant stallion known for transmitting exceptional speed — and his dam was Somethingroyal, who contributed durability and stamina. The combination was unusual. Bold Ruler typically passed on speed at shorter distances. Somethingroyal’s influence pushed Secretariat toward stamina. The result was a horse that could run the Kentucky Derby distance like a sprinter and the Belmont distance like a machine that got faster the longer it ran.
His exercise rider Jim Gaffney described his early motion as having a “beautiful fluid motion” that set him apart from every other horse in training. By the time his two-year-old season was complete, he had won the Horse of the Year title — a distinction almost never given to a two-year-old. The racing world understood something exceptional was happening. What they didn’t yet know was how exceptional.
The Record-Shattering 1973 Season
The Kentucky Derby: Breaking Two Minutes
On May 5, 1973, Secretariat ran the Kentucky Derby in 1:59 2/5 — the first horse in Derby history to break the two-minute barrier. What made the performance even more remarkable was his split times. Most horses run the first quarter faster and slow as fatigue builds. Secretariat ran each quarter-mile faster than the one before it: :25 2/5, :24, :23 4/5, :23 2/5, :23. He ran the last quarter of a mile-and-a-quarter race faster than he ran the first. That is physiologically extraordinary, and no horse since has come within a second of his Derby record.
The Preakness Stakes: The Move on the Backstretch
Two weeks later at Pimlico, Secretariat made a move on the backstretch that stunned everyone watching. From last place in the early going, he swung four-wide on the turn and ran through the field as if the other horses were standing still. His official time of 1:53 set a new Preakness record. There was a timing controversy about his actual time — some clockers had him at 1:53 flat — but regardless of which figure you use, the performance was decisive in a way that transcended the clock.
The Belmont Stakes: The Race That Ends the Debate
If the Derby and Preakness left any doubt, the Belmont Stakes on June 9, 1973 removed it permanently. Secretariat won by 31 lengths — the longest winning margin in Triple Crown history — in a time of 2:24 flat for a mile and a half. That record has stood for over 50 years. No horse has run within two seconds of it. Chic Anderson’s call captured what everyone watching felt: “Secretariat is widening now! He is moving like a tremendous machine!”
| Race | Secretariat’s Time | Previous Record | Improvement | Record Status |
|---|---|---|---|---|
| Kentucky Derby | 1:59 2/5 | 2:00 | −0.4 sec | Still stands (2026) |
| Preakness Stakes | 1:53 | 1:54 | −1 sec | Still stands (2026) |
| Belmont Stakes | 2:24 flat | 2:26.6 | −2.6 sec | Still stands (2026) |
The Physical Traits That Made It Possible
Standing 16.2 hands and weighing over 1,100 pounds, Secretariat’s build was exceptional even by Thoroughbred standards. His chest was so broad it required a custom-made girth. His hindquarters were notably more muscular and defined than typical racehorses of his era — the kind of conformation that horsemen describe as “built from behind,” meaning the engine is in the back. His sloping shoulders allowed for a long, reaching stride, and his deep barrel provided lung capacity that most Thoroughbreds simply don’t have.
Sportswriter Charles Hatton famously remarked after examining him that “his only point of reference is himself.” That observation holds up. You can compare his measurements to other champions and find no meaningful precedent. His stride was estimated at 25 feet — a length that, combined with his stride frequency, produced the ground-covering efficiency that made 31-length victories possible.
For more on what conformation means for performance, see why horse conformation matters — the principles that made Secretariat exceptional apply to every racehorse evaluated today.
The Science: Heart, Stride, and Muscle
The Heart
When Secretariat was euthanized in 1989 due to a painful hoof condition called laminitis, the veterinarian who performed the necropsy discovered something that explained everything. His heart weighed approximately 22 pounds. The average Thoroughbred’s heart weighs 8-9 pounds. The largest heart previously recorded in a racehorse was around 14 pounds. Secretariat’s heart was nearly three times normal size — documented by the Kentucky Derby Museum — and it pumped blood with a capacity that no instrument at the time could fully measure.
A larger heart means more blood pumped per beat, which means more oxygen delivered to muscles per stride, which means less fatigue accumulation over distance. This is why Secretariat didn’t tire at the end of the Belmont — his cardiovascular system was still operating within comfortable range at a pace that would have destroyed any other horse in the field.
Muscle Composition and Speed Figures
Secretariat’s muscle composition combined fast-twitch fibers — responsible for explosive acceleration — with an unusually high proportion of slow-twitch fibers, which sustain effort over distance. Most elite sprinters are heavily weighted toward fast-twitch. Most stayers toward slow-twitch. Secretariat had both in proportions that shouldn’t physiologically coexist at elite levels. This is why he could run the first quarter of the Derby like a sprinter and the last quarter of the Belmont like a distance horse still accelerating.
His Beyer Speed Figures for the Triple Crown were described as “off the charts” for the era — a rating system that adjusts for track conditions and competition, making comparisons across different surfaces and eras more accurate. His Timeform ratings, the European equivalent, placed him at the top of any historical ranking. For a deeper look at what drives racehorse speed, see the science of horse speed.
How Secretariat Compares to Other All-Time Greats
The horses most often mentioned alongside Secretariat are Man o’ War, Seabiscuit, Dr. Fager, and the modern Triple Crown winners. Each comparison is worth making honestly — because the distinctions reveal exactly why Secretariat’s claim holds up.
| Horse | Era | Best Distance | Key Achievement | Belmont Time |
|---|---|---|---|---|
| Secretariat | 1973 | 1½ miles (classic) | Triple Crown — records in all 3 races | 2:24 flat |
| Dr. Fager | 1968 | 1 mile | World record mile: 1:32.1 (134 lbs) | Did not run |
| Man o’ War | 1919–1920 | Classic distances | 20-1 record, dominated his era | Pre-standardized timing |
| American Pharoah | 2015 | 1½ miles (classic) | First Triple Crown since 1978 | 2:26.65 |
| Flightline | 2022 | 1¼ miles | Retired unbeaten, 6 from 6 | Did not run |
My personal favorite among the all-time speed horses is Dr. Fager — the 1968 Horse of the Year who set the world record for the mile running 1:32.1 at Arlington Park while carrying 134 pounds. That performance is one of the most extraordinary things I’ve ever studied in this sport. Dr. Fager was the supreme miler — brilliant, powerful, and capable of a quarter-mile split of 20 and 3/5 seconds that has never been replicated. But Dr. Fager and Secretariat were great in different ways at different distances. Asking which was faster is like asking whether a sprinter or a marathon runner is the better athlete. The answer depends entirely on the distance.
Man o’ War is the strongest historical argument against Secretariat’s claim. He was unbeaten in 20 of 21 races and dominated his era completely. The problem with the comparison is that his records were set before standardized timing on tracks of inconsistent preparation. He was great — whether he was faster than Secretariat at classic distances is something the clock simply cannot answer across a 53-year gap.
Seabiscuit, whose story is covered in our Seabiscuit facts guide, was a remarkable horse but not a speed argument. His greatness was resilience, heart, and the ability to beat War Admiral in a match race. Those are real achievements — just not the same conversation.
Among modern horses, American Pharoah’s Belmont time of 2:26.65 is the closest anyone has come to Secretariat on the same track under the same conditions. Two and a half seconds in a horse race is an eternity. Modern GPS tracking confirms that elite Thoroughbreds peak around 40-44 mph in short bursts — faster than Secretariat’s sustained race averages — but no horse has sustained those peak speeds over a mile and a half under race conditions. Secretariat’s Belmont average of approximately 37.5 mph over 1½ miles remains unmatched as a sustained performance.
| Horse | Distance | Time | Avg Speed | Context |
|---|---|---|---|---|
| Secretariat | 1½ miles (Belmont) | 2:24.00 | ~37.5 mph | Race — record still stands (2026) |
| American Pharoah | 1½ miles (Belmont) | 2:26.65 | ~36.8 mph | Race — closest modern comparison |
| Dr. Fager | 1 mile | 1:32.1 | ~39.1 mph | Race — world record, 134 lbs carried |
| Winning Brew | 2 furlongs | 20.57 sec | ~43.97 mph | Timed trial (Guinness record) — not a race |
Why Some Say Secretariat Wasn’t the Fastest
The main counterargument comes from sprint speed. Horses like Winning Brew have been clocked at nearly 44 mph over two furlongs in timed trials — faster than Secretariat’s race averages. Some also argue that timing technology in 1973 was less precise than modern systems, making era comparisons unreliable. And there are those who point to Dr. Fager’s world record mile as evidence that Secretariat wasn’t even the fastest horse of his own decade over a shorter distance.
These objections are worth hearing — but none of them survive contact with what “fastest horse to race” actually means. Winning Brew’s two-furlong trial was not a race. Sprint speed over 440 yards tells you nothing about sustained performance over classic distances. Timing precision in 1973 was sufficient to establish records that have been tested against modern measurement for 50 years. And Dr. Fager’s dominance at the mile doesn’t diminish Secretariat’s dominance at a mile and a half — they were exceptional at different distances, which is precisely the distinction the definitional section above establishes. At classic race distances under real race conditions, no horse in recorded history has produced times that approach Secretariat’s 1973 Triple Crown. The counterarguments address a different question.
Legacy and Breeding Impact
Secretariat’s career as a sire was modest by commercial standards — his sons were generally disappointing at the track. This surprised the breeding industry at the time and remains somewhat puzzling. The prevailing theory is that his combination of traits was too rare and too specific to transmit reliably. You can’t simply breed a 22-pound heart into a horse by pairing two champions.
His daughters, however, became some of the most influential broodmares in Thoroughbred history. Through the female line, Secretariat’s genetics continue appearing in pedigrees of champions across multiple decades. His influence is present in the bloodlines of horses racing today — not directly, but through the maternal lines his daughters established. The history of the Triple Crown runs through Secretariat in ways that continue to shape breeding decisions.
His cultural legacy is equally durable. The Disney film Secretariat (2010) introduced his story to a generation that hadn’t watched him run. Statues at Belmont Park and the Kentucky Horse Park mark his place in the sport’s history. His name is the first reference point in any serious conversation about racehorse greatness — not because of sentimentality, but because the records he set have not been surpassed.
FAQs About Secretariat
Was Secretariat the fastest horse to ever race?
Yes, based on the available evidence. Secretariat set records in all three Triple Crown races in 1973 that remain unbroken more than 50 years later. His Belmont Stakes time of 2:24 flat for a mile and a half has never been approached — the next closest in the race’s modern history is more than two seconds slower. No horse in recorded racing history has produced comparable times at comparable distances under race conditions.
How fast was Secretariat?
Secretariat averaged approximately 37.7 mph across the Triple Crown races. His Kentucky Derby time of 1:59 2/5 translates to roughly 37.5 mph over a mile and a quarter. His Belmont Stakes time of 2:24 flat for a mile and a half translates to approximately 37.5 mph — but the extraordinary detail is that his mile fraction within the Belmont was 1:34 1/5, faster than the Belmont Park mile record set by his own sire, Bold Ruler.
What was Secretariat’s Kentucky Derby time?
Secretariat ran the 1973 Kentucky Derby in 1:59 2/5, becoming the first horse in the race’s history to break the two-minute barrier. The record still stands. His splits — :25 2/5, :24, :23 4/5, :23 2/5, :23 — showed him running each successive quarter-mile faster than the previous one, a pattern of negative splits that remains unique in Derby history.
Why was Secretariat so fast?
Three physiological factors combined to make Secretariat uniquely fast. His heart weighed approximately 22 pounds — nearly three times the average Thoroughbred’s 8-9 pound heart — giving him cardiovascular output no other racehorse has matched. His muscle composition combined fast-twitch and slow-twitch fibers at an unusual ratio, enabling both explosive acceleration and sustained speed. And his conformation — 25-foot stride, deep chest, sloping shoulders, powerful hindquarters — produced biomechanical efficiency that allowed him to cover ground with minimum energy expenditure.
Did Secretariat win the Triple Crown?
Yes. Secretariat won the 1973 Triple Crown by winning the Kentucky Derby, Preakness Stakes, and Belmont Stakes — setting new records in all three races. He was the first horse to win the Triple Crown since Citation in 1948, ending a 25-year drought, and the only horse in history to set records in all three races in the same Triple Crown campaign.
How big was Secretariat’s heart?
Secretariat’s heart was discovered during his necropsy in 1989 to weigh approximately 22 pounds. The average Thoroughbred heart weighs 8-9 pounds. The previous largest recorded heart in a racehorse was around 14 pounds. This condition — an enlarged heart — is genetic and has been traced through the female line. It has appeared in other champions including Sham (the horse who ran second to Secretariat in 1973 and would have set records in any other year) and more recently in several Kentucky Derby winners.
Was Man o’ War better than Secretariat?
Man o’ War was arguably the most complete racehorse in American history before Secretariat. He went 20-1 in 21 career starts and dominated his era as completely as Secretariat dominated 1973. The honest answer is that direct comparison is impossible — they raced 53 years apart on different tracks under different conditions. What can be said: Secretariat’s times have been tested against modern competition and held up for 50 years. Man o’ War’s times were never tested against standardized measurement. Neither argument can be definitively resolved, which is why the debate continues.
Has any horse come close to Secretariat’s Belmont record?
No. The closest any horse has run the Belmont Stakes in the modern era is American Pharoah’s 2015 time of 2:26.65 — more than two and a half seconds slower than Secretariat’s 2:24 flat. American Pharoah was a Triple Crown winner and one of the best horses of the modern era. The gap between his Belmont time and Secretariat’s is wider than the gap between American Pharoah and every other horse in that race. Secretariat’s Belmont record is not approaching the end of its lifespan.
What happened to Secretariat?
After retiring from racing in late 1973, Secretariat stood at stud at Claiborne Farm in Paris, Kentucky. His career as a sire was commercially modest — his sons generally didn’t match his ability — but his daughters became highly influential broodmares. In October 1989, Secretariat was diagnosed with laminitis, a painful and debilitating hoof condition. He was euthanized on October 4, 1989, at age 19. He is buried at Claiborne Farm.
The Verdict: Was Secretariat the Fastest Horse to Ever Race?
After 30 years at the rail watching Thoroughbreds run at every level from maiden claimers at Evangeline Downs to stakes races at Fair Grounds, my answer to whether Secretariat was the fastest horse to ever race is unambiguous: yes. The clock says so. The records say so. The fact that nothing in 50 years of racing has approached his Belmont time says so most clearly of all.
The debate about the “greatest” racehorse is legitimate — greatness involves era, competition quality, versatility, and factors that don’t reduce to a single number. But at classic race distances, the clock makes the case clearer than any argument. Secretariat’s times remain the benchmarks against which every subsequent champion is measured, and every subsequent champion has fallen short.
Modern GPS and biometric tracking now show elite Thoroughbreds reaching peak speeds of 40–44 mph in short bursts. What those same systems have not shown is any horse sustaining anything close to Secretariat’s Belmont pace over a mile and a half. The technology has gotten better. The record has not moved.
- All three Triple Crown records set in 1973 still stand — Kentucky Derby (1:59 2/5), Preakness (1:53), Belmont (2:24 flat)
- Belmont record untouched for 50+ years — American Pharoah, the best modern Triple Crown winner, ran 2:26.65 — more than two seconds slower on the same track
- 22-pound heart — nearly three times the average Thoroughbred’s — gave him cardiovascular output no other racehorse has matched
- Negative splits at the Kentucky Derby — each quarter-mile faster than the last over 1¼ miles; physiologically unique in Derby history
- Sprint records (Winning Brew) don’t apply — timed trials over two furlongs measure a different thing entirely; Secretariat’s claim is about sustained race speed over classic distances
- Dr. Fager holds the mile record (1:32.1) — the fastest horse at a mile; Secretariat was the fastest at 1¼ to 1½ miles — different horses, different distances, both extraordinary
Also Read: Every Horse That Won the Triple Crown — Facts and Records
Also Read: Dr. Fager: The World’s Greatest Racehorse?
Also Read: The Fastest Horse Breeds and the Races They Run
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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