Since fall foliage relies on weather, peak foliage varies year to year and is hard to predict. One good thing to know is that leaves change in higher elevations first and then work their way down to lower elevations. So if you find yourself on the coast of New England in early October and the leaves have yet to change, you can likely find colors if you go up into the mountains.
While the timing of peak foliage does vary, here are some general timeframes where each region on this guide experiences the best colors, as well as what dates we visited this region and what our experience was like, plus the fall foliage trackers we used.