May is National Burger Month. White Castle Free Slider Day is right in the middle on May 15, followed by National Burger Day on May 28. When food “holidays” like these roll around, we expect to see free food deals. And, every year, White Castle takes the spotlight by offering a free slider to customers for White Castle Free Slider Day (also known as National Slider Day).
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National Slider Day is a one-day event with free and cheap sliders.
Although fast-food chain White Castle started National Slider Day back in 2015 as a way to honor its signature menu item, the slider, many other restaurants have joined in to celebrate the miniature hamburgers with free or discounted sliders. Most reliably, White Castle gives out a free slider with coupon.
KCL confirms that the next National Slider Day will happen May 15, 2025.
Fast-food slider giant White Castle started National Slider Day (and arguably, the slider itself) in 2015, proclaiming it to be May 15. So every year, regardless of the day of the week, it’s the same day. Next year, you can celebrate with cheap sliders on Thursday, May 15, 2025.
Use a coupon to get your free White Castle Slider on National Slider Day.
To get your free Original slider from White Castle (reg $1.25) in 2024, you had to use a special promo code during checkout at WhiteCastle.com or in the White Castle app. For in-store orders, you could also print or download their Free Slider coupon and show it to the White Castle cashier on National Slider Day. No purchase was necessary. This offer is limited to one slider per person per visit.
Look for more National Slider Day offers from Krystal and Dog Haus.
Krsytal is offering fans a free Original or Cheese Krystal with any purchase on National Slider Day.
Dog Haus has a $1.50 Slider Day deal on their Cheeseburger Sliders (reg $3.49). This offer is valid for dine-in and takeout orders today only.
Check out how Red Robin Royalty members can get free burgers by following our tips and tricks.
National Hamburger Day deals
National Hamburger Day is two weeks after White Castle's National Slider Day which means even more discounted burgers in May. Here are some of the deals that you can pick up on May 28, 2024:
Bad Daddy's Burger Bar: Grab a limited-time Birria Burger and a Modelo Pint for $3 at Bad Daddy's Burger Bar. Offer not valid in North Carolina.
Bar Louie: Rewards members can earn triple points on Bar Louie craft burgers on National Hamburger Day. If you're not already a rewards member you can sign up for free by 7 p.m. May 28 to get in on this deal!
Burger King: Buy a hamburger through the Burger King app on National Hamburger Day it'll only cost you $0.70.
BurgerFi: Celebrate National Hamburger Day with a $3 BurgerFi Burger with a Freestyle Beverage Purchase on May 28. Offer is valid for dine-in only.
Dog Haus: Dog Haus Rewards members can enjoy BOGO Haus Burgers on National Hamburger Day. Offer valid for online or in app orders only.
Habit Buger Grill: You can get two Charburgers, two sides, and two drinks for $20 at Habit Buger Grill.
Smashburger: You can enjoy a $5 Classic Singles at Smashburger on Tuesday, May 28 in store or when you use the promo code CLASSIC24 at SmashBurger.com or in the Smash Burger app.
The Greene Turtle: Celebrate National Hamburger Day with half-off burger at The Greene Turtle. Offer is valid for dine-in only on May 28.
Wayback Burgers: Earn a 120 points (that's enough for a Double Bacon or Cheesy Burger) when you order $10+ three times through your Wayback Rewards account at Wayback Burgers. Offer is valid for in-apponline and in-restaurant orders.
Wendy’s: Score a $0.01 Junior Bacon Cheeseburger (reg. $3.39) with any Wendy's purchase online or in the Wendy's app on National Hamburger Day.
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