What if my F-1 visa expires while I am in the U.S.?

Your F-1 visa does not determine how long you may stay in the U.S. You need not be concerned about the expiration of your F-1 unless you decide to leave the U.S. for a short visit abroad prior to completing your studies. Before you re-enter the U.S., you will need to make sure you have a valid US student visa. The F-1 visa itself (unlike your F-1 status) is only important at the port of entry to the U.S.