The last horse to win the Grand National at 100/1 was Mon Mome, who triumphed at Aintree in 2009.
Trained by Venetia Williams and ridden by a 23-year-old Liam Treadwell on his very first Grand National ride, Mon Mome crossed the line 12 lengths clear of the field to produce one of the most remarkable results in the race's long history.
It remains the most recent time a 100/1 shot has won the world's most famous steeplechase.
In total, five horses have won the Grand National at odds of 100/1 or bigger. Mon Mome is the most recent, but the story of these extraordinary upsets stretches back almost a century.
Mon Mome: The Last 100/1 Grand National Winner
Nobody gave Mon Mome much of a chance going into the 2009 Grand National. At 100/1, he was dismissed by punters and tipsters alike, and his jockey Liam Treadwell was an unknown quantity at the highest level, stepping up for his first ride in the race at just 23 years old.
What followed was the stuff of racing legend. Treadwell produced a masterclass of a round, giving Mon Mome a confident, unhurried ride through the field before asking him to stretch clear in the closing stages. The horse obliged emphatically, beating the previous year's winner, Comply or Die, by 12 lengths.
“It's absolutely unbelievable,” Treadwell said afterwards. “I had the perfect run throughout the race, and he jumped brilliantly for me.”
Trainer Venetia Williams, who saddled Mon Mome for owner Vida Bingham, made history in the process. She became only the second woman to train a Grand National winner, following Jenny Pitman, who achieved the feat in 1983 and 1995. Sue Smith and Lucinda Russell have since joined them in the female Grand National trainers' roll of honour.
All Five 100/1 Winners in Grand National History
The Grand National has produced shocks that no other race can match. Here, in chronological order, are the five horses who won at odds of 100/1 or greater.
Tipperary Tim (1928)
The earliest of the five, Tipperary Tim was ridden by William Dutton in what became one of the most chaotic Grand Nationals ever run. Before the race, a friend reportedly called out to Dutton: “Billy boy, you'll only win if all the others fall down.” That prediction proved eerily accurate. Of the 42 runners, 41 fell or refused to complete the course. Only two horses finished. Tipperary Tim was one of them, and he won.
Gregalach (1929)
Just a year later, lightning struck twice. Gregalach, trained by Tom Leader and ridden by Robert Everett, won the following year's race at 100/1. What makes the achievement all the more striking is the size of the field he beat: 66 runners entered in 1929, the biggest field in the race's history, and Gregalach beat the favourite to take the prize.
Caughoo (1947)
An eight-year-old Irish gelding trained by Herbert McDowell and owned by John McDowell, who had purchased him for just £50, Caughoo was ridden by Eddie Dempsey.
Foinavon (1967)
Perhaps the most famous shock of them all. At the 23rd fence, a loose horse called Popham Down caused a mass pile-up that brought down or unseated nearly the entire field. John Buckingham, riding Foinavon, was far enough back to see the chaos unfold and steered his horse wide to avoid it. By the time the other jockeys had remounted and set off again, Foinavon was gone. He won by 15 lengths. The fence is now named the Foinavon fence in his honour, a permanent reminder of one of sport's great accidental victories.
Mon Mome (2009)
Covered in full above. The most recent 100/1 winner and the benchmark against which all future long-shot victories will be measured.
The 100/1 Runners in the 2026 Grand National
The 2026 Grand National takes place on Saturday, 11 April, and as ever, the field includes several runners available at 100/1 or bigger.
The biggest-priced entries include; Marble Sands (100/1); Top Of The Bill (100/1) ridden by Toby McCain-Mitchell, the grandson of the legendary Red Rum trainer Ginger McCain; and Beauport (100/1), trained by Nigel and Willy Twiston-Davies.
Beauport: The One to Watch Among the Big Outsiders
If any of the 100/1 runners in 2026 is worth a second look, it is Beauport.
Trained by Nigel and Willy Twiston-Davies and ridden by Sam Twiston-Davies, the ten-year-old arrives at Aintree with a profile that suggests he is not simply making up the numbers.
In 2025, Beauport finished 12th in the Grand National at odds of 33/1, a price which reflected genuine respect from the market.
He is now available at 100/1* for the 2026 renewal, which many each-way punters will see as great value.
His stamina for the trip is not in question: he won the 2024 Midlands Grand National at Uttoxeter over four miles and two furlongs, and followed that up with a victory in the Berkshire National at Ascot in November 2024, winning by 31 lengths. Owned by Bryan and Philippa Burrough, he is a horse who clearly thrives over marathon distances.
The numbers stack up in another way too. Betfred are paying each-way bets to six places in the 2026 Grand National. Beauport's 12th-place finish last year came at much shorter odds. He would not need to improve dramatically to creep into the places, and at 100/1 each-way, the return on a placed finish would be significant.
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Would he win? Almost certainly not. But then nobody thought Mon Mome would win in 2009, or that Foinavon would thread his way through a 23-fence catastrophe in 1967.
The Grand National has a long and wonderful habit of proving the sceptics wrong, and among this year's big outsiders, Beauport makes as compelling a case as any.
*The odds and runners listed for the 2026 Grand National are correct at the time of writing but may change before raceday. Always check the latest information before betting
