FREE Slider at White Castle on National Slider Day – May 15, 2025!

Celebrate Slider Day with a Tasty Freebie – No Purchase Required

White Castle is celebrating National Slider Day on May 15th, 2025, by giving everyone a FREE slider — no purchase necessary! Just use the promo code SLIDERDAY in the White Castle app or grab the digital coupon from their social media pages. It’s a one-day-only offer, so mark your calendar and get ready to claim your free bite!

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What You’ll Get

• 1 FREE Original Slider
• Redeemable with promo code “SLIDERDAY” in the app
• No purchase required

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How to Claim It

1. Download the White Castle app or visit their Locations Page
2. Log in or create an account
3. On May 15th, enter the promo code SLIDERDAY in the app
4. OR grab the digital coupon from White Castle’s official social media pages
5. Show the offer in-store to claim your free slider

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Important Dates

• Offer valid only on May 15, 2025 (National Slider Day)
• One day only – don’t miss it!

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Any Restrictions or Notes

• No purchase necessary
• Limit one free slider per customer
• Valid in-store or in-app at participating White Castle locations
• Must present digital coupon or app code to redeem
• Offer subject to availability

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Want More Fast Food Freebies?

Check out more delicious offers here:

• Freebies – snacks, meals, drinks & more
• Deals – daily updated food savings
• Sweepstakes – win gift cards, food prizes & more
• Just Posted – new offers every day
• Become a Member – and get alerts before offers expire

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Set a Reminder for May 15 – Your Free Slider Awaits!

Don’t miss this one-day White Castle giveaway. Whether you’re a longtime slider fan or just craving a quick freebie, use the “SLIDERDAY” code on May 15 and score your free slider — no strings attached!