Check carefully your timing, by then some of the far N may be gone! We've got friends in Franconia NH and I'm pretty sure that would be too late. DH just called out end of Sept to Mid Oct in the White Mtns.
Google fall foliage in NE, this site was one that popped up:
http://www.yankeefoliage.com/peak-foliage-forecast-map/
but there were a whole bunch more.
Almost any road in NE will be beautiful, we like the Mohawk Trail & Rt 2 In Ma, since they are further S you might have better luck if you are going to do 1 st week.
Just keep in mind that it's a natural event and the weather plays a huge role in the turnig of the leaves and that's the weather all year, how much rain the trees got, etc. As it gets closer, keep checking.
My favorite are the sugar maples, they turn that bright crimson red...set off by the bright yellows...
If you've never been to NE you also might like to take day or more trip to Nantucket (our favorite) or Martha's Vineyard. Both really neat places.
Enjoy it, maybe we'll cross paths, we're usually back visiting family that time of yr, we have a wedding in the Finger Lakes of NY in late Sept :)