My passport will expire soon; do I need to get a new passport or visa?
While visa regulations state that a passport must be valid for at least six months beyond the date of the holder's departure from the United States, the United States has an agreement with many countries (including the Czech Republic) automatically extending the validity of a passport for six months past the passport's expiration date. The result is that an Czech passport need remain valid only for the duration of the holder's stay in the United States.