National Shake Day T&Cs:

Offer valid only on 9/12/2024 at participating U.S. Smashburger® locations. Coupon may be utilized for takeout or pick up orders only placed in store or online through the smashburger.com website or Smashburger® app during regular business hours. Store hours may vary. Offer for a $3 hand-spun shake (not including applicable taxes). Offer applies to shakes in any flavor, including dairy shakes, and non-dairy shakes if available at participating location. Must use promo code “SHAKES” at checkout in store or online.  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.  © 2024 Smashburger IP Holder LLC.  All rights reserved.