You can download the Shack App to your iOS device to get a free single ShackBurger from Shake Shack. Redeemable at any U.S. Shack (except airports, stadiums and ballparks) until Tuesday, February 28th, 2017.
Shake Shack: Free Burger W/ Shack App
You can download the Shack App to your iOS device to get a free single ShackBurger from Shake Shack. Redeemable at any U.S. Shack (except airports, stadiums and ballparks) until Tuesday, February 28th, 2017.