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I've noticed the same phenomenon where I live in Patagonia. Two weeks ago, my wife noticed that some trees were changing their leaf colors earlier than usual, which isn't too surprising. But then we noticed that wild apple trees and berries were also producing fruits about a month earlier than expected. I joked saying autumn is arriving earlier this year now I'm a bit worried about the whole situation

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I don't know what would cause a tree to sprout leaves earlier in the spring. And I don't know if the article explains that because of the paywall. Maybe it has to do with temperature?

As far as shedding leaves earlier in the fall, I heard they determine that based on when they've collected enough CO2. The more CO2 in the atmosphere, the less time it takes the trees to meet their goals.

For most plants, it’s average temperature for a period of time.

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