Fall Bridal Hair: What to Book If Your Wedding Is This Year Fall is the most popular wedding season — and we know it. If your wedding is in October, November, or early December, your hair preparation window is right now. Here's exactly what we recommend booking and when. Timeline for Fall Brides 8-12 weeks before the wedding: Extension installation (if desired). This gives you time to adjust, have a maintenance appointment, and feel completely confident before the day. 6-8 we