Kentucky Derby betting reaches unprecedented popularity, yet proves surprisingly confusing

(SeaPRwire) –   On the first Saturday of May, 150,000 spectators will gather at Churchill Downs in Louisville, dressed in their finest attire. Millions more will tune in from home; in 2025, the television audience reached 17.7 million, the highest viewership for the Derby since 1989.

Wagering also reached new heights, with bettors placing a record $234.4 million on the main race. Total betting for the full Derby Day schedule hit $349 million, while the entire Derby Week saw $473.9 million in wagers—marking the fourth consecutive year of record-breaking figures.

While these numbers are massive for a two-minute event, placing a bet on the Derby through standard sports betting apps is surprisingly complicated. This difficulty stems from the fact that the Kentucky Derby operates under a legal framework entirely different from the one supporting the $166.94 billion U.S. sports betting industry.

Kentucky’s wagering regulations

Kentucky law mandates that horse race betting must be pari-mutuel. This requirement results in a wagering experience that is fundamentally different from the fixed-odds betting offered by platforms like DraftKings, FanDuel, or BetMGM for events like the Super Bowl.

In a pari-mutuel model, participants bet against one another rather than against the house. All money wagered on a specific horse enters a collective pool. The track deducts a “takeout” percentage to cover operations, prizes, and regulatory costs, and the remaining pool is split proportionally among the winners. It is a system where the house is guaranteed to win.

Because of this structure, odds continue to shift until the race begins based on the volume of bets placed. A bettor might lock in a wager when a horse is at 5-1, only to have those odds drop to 3-1 by post time, resulting in a smaller payout. This system is a legal requirement for all horse racing bets in Kentucky, whether made at the track or via a mobile app.

This model is difficult to integrate into the modern sports betting landscape. On apps like BetMGM, Super Bowl bettors receive fixed odds the moment they place their wager, ensuring a guaranteed payout. This is the experience most Americans now expect, making the structural differences of the Derby—along with complex bet types like exactas and trifectas—feel like a foreign language to casual fans.

Even for regular bettors, the terminology can be dense: “win” (finishing first), “place” (finishing first or second), “show” (finishing first, second, or third), “exactas” (predicting the top two in order), “trifectas” (the top three in order), “superfectas” (the top four in order), and “Pick 4s” (winners of four straight races), with even more complex options like Pick 5s and 6s.

These complexities prevent Kentucky’s nine licensed sportsbooks—including FanDuel, DraftKings, BetMGM, Caesars, bet365, Fanatics, theScore Bet, Circa, and Prime—from simply adding horse racing to their platforms. A bookmaker authorized for NFL betting must still secure separate licenses, totalizator systems, and simulcast rights to offer pari-mutuel racing.

In fiscal year 2025, these nine sportsbooks handled more than $2.72 billion in total bets in Kentucky, generating $284.7 million in revenue. DraftKings and FanDuel led the market, but Churchill Downs’ own TwinSpires remains the dominant horse racing platform because it was built specifically to handle the pari-mutuel system.

While the broader U.S. sports betting market reached $166.94 billion in 2025—with 20% of adults participating—the Thoroughbred pari-mutuel handle was only about $11 billion. This is a significant drop from its $15 billion peak in 2003 and represents only a small fraction of the overall sports wagering market.

A federal legal dispute

While state laws create hurdles for users, a federal legal conflict nearly resulted in a total blackout of legal Derby betting for anyone outside of Louisville this year.

The Horseracing Integrity and Safety Authority (HISA), established by a 2020 federal law, was created to enforce national safety and anti-doping rules. To fund itself, HISA charged tracks based on a formula involving race starts and purse sizes. Churchill Downs refused to pay, arguing the law only allowed fees based on race starts, and withheld payments throughout 2025.

By early 2026, HISA ordered Churchill Downs to pay roughly $5.27 million or face a racing suspension. HISA also threatened to cut off the track’s simulcast rights. Since the Derby’s $349 million handle relies on national distribution, such a ban would have effectively stopped legal betting on the race for millions of people across the country.

A private settlement was reached on March 24, resolving the immediate crisis. Shortly after, on April 1, a U.S. District Court judge ruled that HISA’s fee calculation method was “arbitrary and capricious” and therefore illegal.

Churchill Downs CEO Bill Carstanjen described the ruling as a victory against HISA’s financial management. Meanwhile, HISA stated the ruling was limited in scope and that the organization remains dedicated to its safety and integrity goals.

New Kentucky legislation

Last month, the Kentucky legislature passed the Wagering Consumer Protection Act, which allows for fixed-odds betting on live horse racing for the first time. This allows bettors to lock in their payout at the time of the wager. Lawmakers recently overrode a veto from Governor Andy Beshear to enact the bill.

Advocates argue that fixed-odds betting will make horse racing more appealing to younger generations by aligning it with traditional sports betting. The law also raises the minimum betting age to 21 and prohibits Kentucky-licensed operators from partnering with prediction markets like Polymarket or Kalshi.

Prediction markets, which fall under federal oversight, allow users to bet on race outcomes without the complexities of the pari-mutuel system. Although the new state law has passed, it is not yet in effect and will not be ready for this Saturday’s race. Consequently, those betting on the country’s most famous horse race will once again have to deal with fluctuating odds.