$4 core shake with any sandwich or burger (code SHAKEIT)

Historical deal record. This offer has expired, but the original terms are kept here for reference.

National Milkshake Day

Buy any sandwich or burger and get a core shake for $4 from September 10 through September 13. Add both items to your cart and enter code SHAKEIT at checkout. The code is case sensitive and works in all caps only. Redeem in the Shake Shack app, on shakeshack.com, or at an in-Shack kiosk. Shake Shack delivery and pickup count. Not valid for drive-thru or third-party delivery. Participating US locations excluding airports, stadiums, arenas, travel plazas, and museums. Limit one shake per order. Max savings $4.99. Excludes limited-time shakes (Dubai, Reese’s, Biscoff Cookie Butter Tiramisu, Chocolate Toasted Marshmallow S’mores, Tropical Mango with Passion Fruit Popping Boba) and paid add-ons such as boba. Applies to the least expensive applicable shake. While supplies last. Cannot be combined with other offers.