Nwew England fall color trip

Some of the nicer parks allow return guests to book a year out which reduces inventory. Many don't and some don't even take reservations the prior year. I'd put a plan together as to when/where you want to go and start picking out campgrounds. Check their cancellation policies and book based on those. Most reservations can be changed to some level. Columbus Day weekend does book up well in advance. Also keep in mind that peak season changes from year to year. You can keep tabs on these foliage websites:

https://newengland.com/seasons/fall/foliage/peak-fall-foliage-map/
https://www.discovernewengland.org/fall-foliage-maps