Japango has a small gluten free menu and the sushi chefs are also very willing to make most of there rolls gluten free/ celiac safe as well. Their regular wasabi has gluten, but if you ask they can bring you a gluten free wasabi. I suggest sitting at the sushi bar if you are celiac so that the chefs can better help you. I sat at a table one time and the waiter was friendly, but made me feel that it would be difficult for the chefs to make food for me. He said he would ask and that it probably would be okay. Obviously, I was very nervous to eat what he brought me. I say at the sushi bar and the chefs made me feel that it was no problem at all and made me delicious rolls. Sushi chef Cory seems to be especially knowledgeable/ careful.
Went there for the first time tonight (4/5/14) and was very pleasantly surprised at how knowledgable the staff was about GF needs. They also had a dedicated GF menu which was really nice because I haven't found any sushi restaurants in Boulder that had a dedicated menu to date. The server went above and beyond working with me to find rolls that were GF and rolls that could be slightly modified to become GF friendly. If you go, definitely try the GF calamari. It was better than any I've ever had, GF or not. I suggested they use the sauce on a new GF roll because it was so yummy and the sauces are what I miss most. Beware, the cider they offer is $22 a bottle. The server was nice enough to point that out when going over the GF beer selections.