YankeeFoliage.com offers a good, animated map that shows the changing leaf colors rolling across New England from September to October, and live, interactive foliage maps for each area. DiscoverNewEngland.com offers a range of foliage maps by state and date that also suggest best viewing options for hiking or driving routes.
YankeeFoliage.com also features a peak foliage forecast map. Foliage generally starts changing color from late September in northern and western areas of New England, and the changes gradually roll southwards to reach Connecticut and Rhode Island by early November. The site also lists a number of scenic foliage driving routes.