Last year I wanted to go in the summer. I don't think I called exactly at the 7 month window, but it was close. The agent at MS told me it was booked solid for all the dates I gave her. Since I teach, I told her I would take anything in June or July. I got a 2br the last week of July. It was actually larger than what I wanted, since it was just my mom and me, but I took it. She said summers are extremely busy.I would call immediately if I were you, and if you can, be flexible. Good luck!