Today in Montpelier i encountered a yellow birch in a northern hardwood forest with no visible color change at all! on October 7th! Also the staghorn sumac which usually is an early changer was still mostly green. The sugar maples are changing but are a less vibrant yellow with brown spots... same as the trees in our yard.
The anomaly is spotty because looking another direction there are many vibrant trees. The red maples seem as red as ever in most cases.
Will continue monitoring as it appears to be an unusual phenomena related to climate change or at least to the unusually warm September. We are getting into the time of year where the mountains sometimes start getting snow, and if the trees up high do not lose their leaves soon they could be damaged.