The only gluten is in the hot food items, which are cooked in a separate area. If you tell them you have a gluten allergy, they'll check with you to make sure the smoothie prep process is safe for you. All smoothies are GF. I think the Boosts have gluten, but I confirmed that they're stored separately and aren't touched with any shared cookware.
I have been 5 times in the past few weeks and haven't been glutened.
— Very
— No gluten-free information on the menu
— Most/All
— Good