A favorite Thai restaurant in the county is inside the Dutch Village Mall (the "windmill building") in downtown Lynden.
I always have the Red Curry Chicken with Brown Rice but nearly all items on the menu are gluten free. See photo above. Sometimes the rice comes in a separate bowl from the Chicken/Vegetables/Red Curry Sauce. For dinner you could ask to have it either way.
Update: This Thai restaurant has changed hands a couple times since I wrote this review. The new owners are not fluent in English, but their spices are safe. A celiac friend and I eat there frequently.
— Very
— Most/All
— Excellent