We stopped here in a pinch. They have a gluten free bun but I’m nervous with chains. But the manager was there and when asked about gluten free he explained the whole system, how they use separate tools, regular buns are toasted in a toaster and gluten free buns are the only bread that goes on the grill. He even offered that the fries were not in a dedicated fryer before we asked. It wasn’t busy and based on his knowledge I felt safe. It was a good burger, the bun got really mushy (probably rice based) but was nice in a pinch, no reaction. I’m not sure how I would feel about all locations but this one is a safe location for me.
Most Shake Shack locations offer gluten-free buns for burgers. A lettuce wrap is also an option.