The US Department of State (DOS) announced that F and M student visas for new students now can be issued up to 365 days before the start date for a course of study. However, the student cannot enter the United States on a student visa more than 30 days before the start date.
F and M student visas for continuing students may be issued at any time, DOS said, as long as the student is currently enrolled at a Student and Exchange Visitor Program-approved school or institution and in the Student and Exchange Visitor Information System. Continuing students may enter the United States at any time before classes start.
Details can be found on the Department of State website.