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. ĂĽ 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.