It is very hard to say when we will see peak foliage as it is related both to the length of daylight (pretty predictable) and temperatures (not so predictable).  If we get a sudden turn to colder temperatures, the leaves could start to change quite quickly.  Typically we would expect to see great foliage peaking in October and into November but within that range it can vary a lot from year to year.

The other piece of good news is that we have had a relatively wet spring and summer in 2017 which is one of the conditions necessary for trees to store the sugars needed to create particularly splendid fall foliage.  So it could be a particularly beautiful fall! Forward to 2020...Fall color in the NYC area came during late October. Quite a beautiful sight. 

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- Courtesy of NYBG Plant Information Service