The Montana State Board of Nursing is in Helena, Mont. They aren't one of the nurse license compact states so, if you travel to Montana, you will need a Montana nursing license.
The website, along with great pictures, has lots of information. They provide info on the application process, license renewal, verification, nursing education and scope of practice guide.
Montana Board of Nursing 301 South Park, 4th Floor P.O. Box 200513 Helena, MT 59620-0513