Warning: always get a second opinion/source. I planned a trip to north Georgia based off of this exact website three years ago and it ended up being about 3-4 weeks before the leaves turned.
I'm in Michigan. This map seems to change all of Michigan to Peak at the same time, which absolutely does not happen.
It varies as you move south in the state, typically a couple weeks apart from way northern Michigan to down by Detroit. Heck, I've been in the Upper Peninsula at peak leaves and then they started falling, gone south a few days later to the northern Lower Peninsula and things were just starting to pop, then home down near Detroit almost everything was still green.
That's... just how it works in Michigan. But that's not what this map shows. And therefore I've no reason to believe it.
Worst website ever.