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).
Here's what you can expect for National Slider Day in 2025, based on what we saw during last year's event.
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Offers, prices, and local participation may vary.
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, 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.
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 date. This 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 (no purchase necessary) from White Castle in 2025, you'll likely need to use a special promo code during checkout at WhiteCastle.com or in the White Castle app. For in-store orders, For in-store orders look for a Free Slider coupon that you can show to the cashier on National Slider Day.
Other Predicted National Slider Day Deals for 2025
Dog Haus: We anticipate Dog Haus will have a $1.50 Slider Day deal on their Cheeseburger Sliders.
Krystal: Krsytal will likely offer fans a free Original or Cheese Krystal with any purchase on National Slider Day. Look for
Smalls Sliders: Rewards members can look for an exclusive free slider with purchase offer at Smalls Sliders on National Slider Day. Plus, look for an Instagram giveaway Smalls Rewards members can enter for a chance to win free sliders for a year.
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