Denny's 3715 31st Street SW 6:00 AM - 10:00 PM 6:00 AM - 10:00 PM 6:00 AM - 10:00 PM 6:00 AM - 10:00 PM 6:00 AM - 10:00 PM 6:00 AM - 10:00 PM 6:00 AM - 10:00 PM3715 31st Street SW Great Falls, MT 59404 US