About this episode

This episode explores the science behind how trees determine when to change color in the fall.

The leaves don’t wait for frost—they’re already counting the night. We dive into the quiet timing system inside trees that decides when the colors ignite, why some years burst into crimson while others fizzle to brown, and how weather and latitude shape the show right above our heads. It’s a guided tour of photoperiodism, phytochromes, and the pigments that paint fall—carotenoids hiding under summer’s green and anthocyanins that arrive late to set maples and oaks on fire. We break down how p...

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