Are the remaining green shoots on the South side of the tree? It could a micro-climate issue. Perhaps it is near a body of water or large rock that has a high thermal mass, meaning that it takes longer to cool down or is somehow protected from the cold.
Or maybe the tree is just doing its own thing. I have a fair few deciduous trees in my yard, even within the same species the times that they will turn vary by over a month, even for trees that are right beside each other.
It's next to a clear cut. Not a drop of surface water. Might be something 5 or 10 feet underneath though.
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