When Is Autumn Equinox 2024 Usa. 22, the fall equinox formally heralds in autumn and marks the end of summer in the northern hemisphere. Autumn 2024 starts on sunday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the changing tilt of the earth's axis.

Here are the equinox and solstice dates—plus, answers to common questions about the. A carefully worded answer is that on sunday, sept.