These Are The Best March Madness Betting Promos Available
Written By Juan Carlos Blanco | Last Updated at October 8, 2025
Some of the best sportsbooks in the US offer March Madness betting promos for new customers who want to wager on the tournament.
The weeks-long stretch of high-stakes, pulse-racing action is unparalleled in the betting space, so it’s no surprise there are multiple Round 1 betting promos for first-time users during March Madness season!
Top March Madness Betting Promos
TheLines.com has highlighted the top new-customer March Madness betting promos from industry-leading sportsbooks, allowing you to add some potential profit to your enjoyment of March Madness!
DraftKings March Madness Promo Code: Up To $1,200 in Bonuses
DraftKings Sportsbook is an optimal choice for bettors due to its wide array of markets, competitive odds, and user-friendly interface.
New DraftKings customers can claim a three-pronged sportsbook promo just in time for March Madness action: The first component is a $50 bonus bet that’s awarded an initial deposit of at least $5; the second is $150 bonus bets with a first-time bet of at least $5; and the third is a 20% first-deposit match up to $1,000, although that has a 25x playthrough requirement.
New Customers: Bet $5+ Get $300 in Bonus Bets If Your Bet Wins + 3 Months of League Pass On Us! Caesars March Madness Promo Code THELINESDYW: Get 10 100% Profit Boost Tokens
Caesars Sportsbook appeals to bettors with its well-deserved reputation for gaming excellence, an abundance of betting choices and plenty of ways to boost potential profit through its prebuilt game and prop parlays.
Bettors new to Caesars Sportsbook can access a welcome bonus via code THELINESDYW, which triggers 10 100% profit boost tokens once an initial wager of as little as $1 is made, whether that bet wins or loses. Tokens are good for 14 days, and the maximum wager amount they can be applied to is $25, meaning they will afford a new bettor plenty of chances to take a shot at March Madness action!
Bet $1, Double your Winnings on your Next 20 Wagers. Up to $25 Max Bet Per Boost BetMGM March Madness Bonus Code THELINES: First-Bet Offer up to $1,500
BetMGM is another brand bettors are highly familiar with and comfortable with. As BetMGM has expanded throughout the US-regulated betting market, it’s gained a robust following thanks to its comprehensive selection of betting options and competitive odds.
BetMGM also has an enticing sportsbook promo for new customers accessible through promo code THELINES, one that entitles new BetMGM users to a refund in the form of bonus bets equal to their first bet amount up to $1,500 if that bet doesn’t cash, which allows for maybe a slightly bigger swing than normal on March Madness.
Bet365 March Madness Bonus Code THELINES: Choose From Two Offers
Bettors who want to get a taste of what internationally renowned sportsbook bet365 offers can do so by utilizing promo code THELINES to access one of two March Madness betting promos.
The first involves making a minimum deposit of $10 and placing an initial bet of $5 on a wager with -500 odds or longer, which entitles the customer to $150 in bonus bets. The second is a first-bet insurance offer that also requires a minimum deposit of $10 and initial bet of $5. If that first bet loses, the bettor will get a refund of bonus bets, up to $1,000.
FanDuel March Madness Promo Code: $200 In Bonus Bets If Your Bet Wins
FanDuel Sportsbook is arguably the leader in the US-regulated betting market, successfully leveraging a brand established in the daily fantasy sports space and offering bettors a user-friendly platform, plenty of promotions and betting options, and some of the best odds in the business.
The sportsbook also welcomes new customers with the following welcome offer just in time for March Madness: $200 in bonus bets if you place a winning initial bet of at least $5. Bonus bets are valid from seven days of receipt.
Best March Madness Betting Promo for Beginners: DraftKings Sportsbook
While any of the above March Madness betting promos would make for appealing entry points into the sportsbook platforms they’re attached to, DraftKings' up to $1,200 in bonuses may be the best for novice bettors.
Given its three facets, bettors have multiple ways to capitalize, and they’re not required to succeed with their initial bet to reap the rewards. Bettors will automatically receive $50 in bonus bets just for depositing at least $5 and another $150 in bonus bets by placing an initial $5 bet.
The third component, the 20% deposit match, has a 25x playthrough requirement but still offers additional funds to wager.
Highest Betting Promo for March Madness: BetMGM
Regarding the betting promo that gives bettors the chance to make a sizable wager, it would seem to be BetMGM’s first-bet offer of up to $1,500.
With the bettor’s stake eligible for a refund of up to $1,500 in the form of bonus bets if it loses, there is a path to taking a chance on a high-risk/high-reward proposition thanks to the safety net of additional betting opportunities if the ticket doesn’t cash.
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