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White Castle Celebrates 10th National Slider Day with Free Original Sliders

On May 15, customers can claim a complimentary Original Slider online or via the app using a promo code, no purchase required.

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White Castle customers can get one free Original Slider in honor of National Slider Day.

Overview

  • White Castle is offering free Original Sliders on Thursday, May 15, 2025, to mark the 10th annual National Slider Day.
  • The promotion requires customers to use a digital coupon or the promo code 'SLIDERDAY' in the White Castle app.
  • No purchase is necessary to redeem the free slider, making it accessible to all customers.
  • National Slider Day was first celebrated in 2015 after Time magazine named the Original Slider 'the most influential burger of all time.'
  • The Original Slider, introduced in 1921, features a 2x2-inch all-beef patty grilled on onions and served on a bun, pioneering the fast-food industry.