We Found The 4 BEST Sportsbook Promos For March Madness In 2025
Crack a window, get your brackets ready, and fire up that sweet CBS theme because March Madness is back, and so are the sportsbook promos.
In 2025, expect more madness than ever as this year’s bracket truly is anyone’s for the taking. And in response, US sportsbooks are rolling out the red carpet for the NCAA Tournament. We dug through all the promotions and bonuses available this March and hand-picked the four best ones available to new bettors. Let’s check out the four BEST March Madness promos available this month.
Keep up with TheLines for complete coverage of college basketball odds all March long. And keep an eye out for college hoops expert Eli Hershkovich to drop his best bets, bracket busters, and more coming soon.
Click PLAY NOW on any of the offers below to head to that sportsbook and sign up with welcome bonuses.
Best March Madness Sportsbook Promos
New bettors can receive thousands in bonus bets and promotional credit by signing up at the following sportsbooks. But existing users should check for daily odds boosts, bet insurance tokens, and more when betting March Madness odds. We chose the following betting apps because they are reputable and legal in the United States. We strongly recommend only betting at legal US sportsbooks, not just in March, but all year long.
BetMGM March Madness Bonus Code THELINES: Get Up To $1,500
TheLines voted BetMGM as having the best sign-up offer for new bettors. It provides a refund of up to $1,500 in bonus bets if your first wager at the book doesn’t win. In March Madness, there’s no better feeling than a potential second chance when anything can happen. Burned in the past by a Saint Peter’s or Oakland? Fear no more — BetMGM will provide bonus bets if your first wager faces the same upset.
Use the bonus code THELINES and opt in to this promo before making your initial deposit. Be sure to use those bonus bets within seven days of receiving them or they’ll expire!
Up to $1,500 in Bonus Bets if Your First Bet Doesn't Win*
*Bonus Bets Expire in 7 Days. One New Customer Offer Only. Add’l terms. 21+. Gambling Problem? Call 1-800-GAMBLER
Use Bonus Code: THELINES
Bet365 March Madness Bonus Code THELINES: Bettor’s Choice!
Bet365 Sportsbook puts a spin on its sign-up offer by giving users the choice between two promos:
- Bet $5, get $150 in bonus bets
- First-bet safety net up to $1,000
These two promos work differently for different bettors. Recreational bettors looking to bet $50 or less per play will see more value in the bet $5, get $150 promo. High-rolling bettors may see more value in having larger bets backed by the safety-net promo. The latter provides a refund in bonus bets if your first wager at bet365 loses, up to $1,000. Use the bonus code THELINES to qualify for either promo and select carefully.
- Bet $5 Get $150 in Bonus Bets Win or Lose
- OR First Bet Safety Net up to $1,000
- 30% Extra on Same Game Parlay Profit
- T&Cs Apply. Gambling Problem? Call or text 1-800-GAMBLER 21+
- Use Bonus Code: THELINES
FanDuel Sportsbook March Madness Promo Code: Bet $5, Get $200
Bet just $5 at FanDuel Sportsbook and, if that bet wins, get $200 in bonus bets instantly! One of the country’s biggest sportsbooks is also one of the most reliable when it comes to great sign-up offers. Opting in doesn’t require a bonus code; simply click PLAY NOW in the banner below to get started. Be sure to note any odds minimums for your first bet before laying -1600 with a No. 1 seed over a No. 16 seed in Round 1.
Get $250
- Bet $5, Get $250 in Bonus Bets if Your Bet Wins
- Available on Desktop, Android & iOS
- Gambling Problem? Call 1-800-GAMBLER. 21+
- To Claim: Click Play Now
DraftKings Sportsbook March Madness Promo Code: Get Up To $1250
DraftKings Sportsbook layers a three-for-one promo for new users this March, totaling up to $1,250:
- Bet $5, get $200 in bonus bets
- A 20% first-deposit match up to a $1,000
- An additional $50 bonus bet at deposit
Win or lose your first bet, DraftKings awards new users $200 in bonus bets in eight $25 increments. Also, DK offers a 20% deposit bonus on initial deposits (note: any previous users, even on DraftKings’ DFS platform, are ineligible), awarded as bonus credit with a 25x playthrough requirement. Finally, get another $50 bonus bet with your deposit (min. $5). There’s no bonus code necessary here — simply click PLAY NOW below to get started.
Bet $5 Get $200 in Bonus Bets
PLUS Get a $50 Bonus Bet on Deposit
PLUS up to $1,000 Deposit Bonus
Gambling Problem? Call 1-800-GAMBLER
How to Claim March Madness Sportsbook Promos
The first step in claiming all of the above bonuses is creating a free sportsbook account. Download your desired sportsbook’s app from the App Store (iOS) or Google Play (Android). You will need to enter some personal information at sign-up like your name, street address, birthdate, and the last four digits of your Social Security number to validate your identity and eligibility. Users must be 21 or older at most books and in most states to participate.
When entering sensitive information, always use a password-protected wireless network.
Once you’ve signed up, it’s time to opt in to promos and make your first deposit. To avoid missing out, we strongly recommend navigating to the appropriate banners above and clicking PLAY NOW. Always opt in to sign-up promos before making your first deposit. Once you’ve done that, it’s time to deposit. The above promos require at least $5 to be deposited into your account initially.
Sportsbooks accept a number of methods for deposit, including the following:
- Credit card/debit card
- Bank transfer/e-check
- Pay Pal
- Venmo
Once you’ve made your deposit, it’s time to get involved in betting on college basketball along with these March Madness promos.
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