When You Enter the United States
Your passport must always be valid at least six months into the future.
J-1 Visa Stamp
A J-1 visa stamp that U.S. consular officials place in your passport allows you to apply to enter or re-enter the United States. It does not guarantee admission to the United States. Nor does it determine your length of stay.
If your J-1 visa expires while you are in the United States
It is not necessary to renew your visa as long as you remain in the country. A visa can only be secured at a U.S. embassy or consulate abroad. Canadians do not require a visa.
I-94 Admission Record
The electronic record of your I-94, after arrival in the United States, along with a valid Form DS-2019, permits you to stay temporarily in the United States as a J-1 student.
A New I-94 Each Time You Enter the United States
Each time you enter the United States, you will be issued a new I-94 card with a new admission number. The exception is when you re-enter the country after visits of 30 days or less to Canada, Mexico, and adjacent islands.
Renewing or Replacing Your Passport
Lost or stolen? Report a lost or stolen passport to the police. Your home country government may require a police report before issuing a new passport.
Renewing or Replacing your Passport: Contact your country’s consulate in the United States.