Like others said... 11 months is usually the open period and they usually book up IMMEDIATELY!
We lost our February spot in 2016 when our boy was born and we didn't make the trek down south with a 2 month old. We haven't been able to get a spot back yet. Last year the waitlist was 100 names long in a campground with about 65 spots... and they stopped taking names long before we called in March!!!
Fuel prices seem to be creeping back up (or so it seems). That might tamper down some excitement from less "devoted" campers!