Offer valid only from 1/24/2026 through 1/25/2026 at participating U.S. Smashburger® locations. Pricing and participation may vary.   Offer available for purchases made in store or online through the smashburger.com website or Smashburger® app during regular business hours. Store hours may vary. Not valid for in store purchases. Offer to receive a complimentary regular size shake in any flavor (not including applicable taxes) when you make a minimum purchase of $15 (before taxes). For in-store orders, must provide promo code FREESHAKE26 during checkout to redeem offer. For online orders, must enter promo code FREESHAKE26 at checkout to redeem offer. Limit of one (1) offer may be redeemed per customer and per transaction.  Discount does not apply to any applicable sales tax. Cannot be used in conjunction with any other offer, promotion, or discount. Not valid on previous purchases. Not valid on orders with third party delivery. 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.