Visa issuance change for new F-1 students
New Students – Student (F and M) visas for new students can be issued up to 365 days in advance of the start date for a course of study. However, you will not be allowed to enter the United States on your student visa more than 30 days before the start date.
Continuing Students - Student (F and M) visas for continuing students may be issued at any time, as long as the student is currently enrolled at a SEVP-approved school or institution and in SEVIS. Continuing students may enter the United States at any time before classes start.
Additional information can be found at: https://travel.state.gov/content/travel/en/us-visas/study/student-visa.html