Did Vermont, all of New England actually, in first week of Oct. 2010 , we were about a week early for that years change, would have been right on time for the 2009
, many RV parks were shutting down for the winter and we couldn't hang around ( did want to really ) because of a hurricane landfall warning.
It takes some cool nights ( frost) to get the change started , I'd say to really get the full view , be ready to hang around for 7>10 days, and keep your fingers crossed for the right weather.
Any RV park your thinking of check their dates of operation.