Offer valid only on 5/28/2026 at participating U.S. Smashburger® locations. Offer available for purchases made in-store or online through smashburger.com or Smashburger® app during regular business hours. Store hours may vary. Offer for a single-patty Smash® Burger for a discounted price of $5.28 (not including applicable taxes). Offer does not apply to any items on the Smashburger $4.99 All-The-Time Menu. For in-store orders, must mention offer at checkout to redeem offer. To redeem offer online, must enter promo code 528SINGLE at checkout. Offer applies to all single-patty Smash® Burger items available on the participating location’s menu and excludes all double-patty items. Protein substitutions for crispy chicken are excluded from this offer. Premium modifiers are excluded and are at an addition cost. No limit on number of coupons that may be redeemed per transaction or per customer.  Offer does not apply to any applicable sales tax. Not valid on catering orders or orders with third party delivery. Cannot be used in conjunction with any other offer, promotion, or discount. Not valid on previous purchases. No cash value (unless prohibited by law, then cash value is $.005). No substitutions. No rainchecks. Company reserves the right to withdraw or change the offer’s terms and conditions at any time, at Smashburger’s discretion, and without notice. While supplies last. © 2026 Smashburger IP Holder LLC. All rights reserved.