Leaf peeping?

We’re leaving for Connecicut tonight. Had planned to do a bit of leaf peeping. But not this year. My sister just emailed –

leaves changing: Well, I’ve just learned that even in Northern VT, on
the Canadian border, the leaves are not yet changing! I’ve never seen a
fall like this.  So, you will see LEAFS not trees changing. 
Bummer, huh. You’ll just have to come back again next year.

I grew up in Connecticut and can also not ever remember a fall where
the leaves on the Vermont/Canada border hadn’t changed by Oct. 5.
Global warming?