Get your passport, credit or debit card ready, and read the help document. Canadian visitors can usually stay in the United States for 6 months without a visa.Among those exempted from this new requirement are U.S. citizens and travellers with a valid visa. You will need your passport when completing the application. Via the "Visa Requirements" section of our Travel and Visa Requirements tool. View, print and download a number of authorization forms and informational documents. ü Travelling to Canada? You have only 30 days to respond, and your local agency can help you fill out the "Answer" form and file it with your county's Superior Court.