Well I live in NH and our foliage is raging right now. Columbus Day weekend is usually the peak of the color change and then the leaves start falling off the trees after that. Keep in mind if you do decide to tour at this time of year that most campgrounds close after Columbus Day, stealth camping is hard to come by around here and the nights are usually very cold (in the 30's this week). So you may have to go for hotels or B&B's or do the warmshowers.org thing. But touring anywhere in New England at this time of year is incredible especially if you run into a sunny 60 degree day, just stunning.