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 where you can expect for National Slider Day in 2026, based on what we saw during the last event..
For more smart shopping tips and savings hacks, text HACKS to 57299.
Offers, prices, and local participation may vary.
National Slider Day is an annual 1-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, 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.
The next National Slider Day will happen on Friday, May 15, 2026.
Fast-food slider giant White Castle started National Slider Day (and arguably, the slider itself) in 2015. So every year, regardless of the day of the week, National Slider Day is on May 15. Next year, you can celebrate with cheap or free sliders on Friday, May 15, 2026.
Use a coupon to get your free White Castle Slider on National Slider Day.
In order to get your free Original slider (no purchase necessary) from White Castle every year, you have to use a promo code during checkout at WhiteCastle.com or in the White Castle app. We expect you'll need a coupon again in 2026.
Predicted National Slider Day Deals for 2026
Dog Haus: Next year, Dog Haus will likely offer a FREE slider when you make a purchase on Slider Day.
Krystal: Look for Krystal to offer fans a free Original or Cheese Krystal with a purchase on National Slider Day (May 15) when you use a promo code at checkout online or in-app.
Smalls Sliders: We anticipate Frequent Sliders Rewards members will have a chance to get a free slider with purchase at Smalls Sliders on National Slider Day 2026. Plus, watch for them to have an Instagram giveaway for a free year's worth of sliders.
Related Reading:
Tell us what you think