These Are The Best March Madness Betting Promos Available

Written By Juan Carlos Blanco | Published at March 16, 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 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+ and get $300 in Bonus Bets if it wins!

Play Now DraftKings Promo

GAMBLING PROBLEM? CALL 1-800-GAMBLER or 1-800-522-4700, (800) 327-5050 or visit gamblinghelplinema.org (MA). Call 877-8-HOPENY/text HOPENY (467369) (NY). Please Gamble Responsibly. 888-789-7777/visit ccpg.org (CT), or visit www.mdgamblinghelp.org (MD). 21+ and present in most states. (18+ DC/KY/NH/WY). Void in ONT/OR/NH. Eligibility restrictions apply. On behalf of Boot Hill Casino & Resort (KS). Pass-thru of per wager tax may apply in IL. 1 per new customer. Must register new account to receive reward Token. Must select Token BEFORE placing min. $5 bet to receive $300 in Bonus Bets if your bet wins. Min. -500 odds req. Token and Bonus Bets are single-use and non-withdrawable. Bet must settle by and Token expires 2/22/26. Bonus Bets expire in 7 days (168 hours). Stake removed from payout. Terms: sportsbook.draftkings.com/promos. Ends 2/15/26 at 11:59 PM ET. Sponsored by DK.

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!

Up to $250 Bonus Bet
Code: TLCSPO20X Copied!

Play Now Caesars Promo

21+ New users only. Must register using eligible promo code. First bet after registration must qualify. Max. Bonus Bet: $1,000. Bonus Bet expires 14 days after receipt. Void where prohibited. See Caesars.com/promos for full terms. Gambling Problem? 1-800-GAMBLER (1-800-426-2537)

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.

Up To $1500 in Bonus Bets Paid Back if your First Bet Does Not Win

Play Now BetMGM Promo

Gambling problem? Call 1-800-GAMBLER (Available in the US) Call 877-8-HOPENY or text HOPENY (467369) (NY) Call 1-800-327-5050 (MA) 21+ only. Please Gamble Responsibly. Call 1-800-NEXT-STEP (AZ), 1-800-BETS-OFF (IA), 1-800-981-0023 (PR). Rewards are non-withdrawable bonus bets that expire in 7 days. In partnership with Kansas Crossing Casino and Hotel. See BetMGM.com for Terms. US promotional offers not available in DC, Mississippi, New York, Nevada, Ontario, or Puerto Rico.

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.

Bet $5 & Get $150 in Bonus Bets Win or Lose
Code: THELINES Copied!

Play Now Bet365 Promo

Whatever the moment. It's Never Ordinary at bet365. That's why if you sign up now you will receive $150 in Bonus Bets Win or Lose when you bet $5! Minimum $10 deposit required. Minimum odds -500 or greater. Bonus Bets wager excluded from returns. New customers only. T&CS, time limits and exclusions apply.GAMBLING PROBLEM? CALL OR TEXT 1-800-GAMBLER (AZ/CO/IL/IN/KS/KY/LA/MD/NC/NJ/OH/PA/TN/VA) or 1-800-BETS OFF (IA). 21+ (18+ KY). Must be present in AZ/CO/IA/IL/IN/KS/KY/LA (select parishes)/MD/NC/NJ/OH/PA/TN/VA.

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.

Bet & Get up to $1,000 in Bonus Bets!

Play Now FanDuel Promo

Gambling Problem? Call 1-800-GAMBLER or visit RG-help.com. Call 1-888-789-7777 or visit ccpg.org/chat (CT). Hope is here. Visit www.helpmygamblingproblem.org (MA). Play it Safe. Call 1-800-547-6133 or visit mdgamblinghelp.org (MD). Call 1-855-860-2942 or visit gamblinghelplineonline.org (WV). 21+ (18+ DC, KY, MD and restricted states for KS). An affiliation with Kansas Star Casino. First online real money wager only. $5 free deposit credited. Bonus credited upon wager of $5 or more within 72 days after receipt. Restrictions apply. See terms at sportsbook.fanduel.com.

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.

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.