We might have to re-arrange the first 2 days of our trip. I just realized that Monday, Sept. 3rd is also a holiday in the states. We were planning to do some shopping in Billings on that day (from about 5-9 p.m.), spend the night and then head over the Beartooth. Can someone tell me what the hours would be for Rimrock Mall, Costco, etc.? Would the stores close early on that day? Appreciate all replies.