It makes sense that most “new school year” planning takes place in the summer, when college ministers have the chance to breathe a little.
But one big aspect of your strategy shouldn’t wait: ideation. Why generate ideas at a time when most of your best idea engines (your students) are no longer immersed in the ministry… and may not even be local?
I’d encourage you to put some brainstorming sessions on the calendar now. It could pay off in spades when you do strategize later on.