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First Day Of Spring Summer Fall Winter 2024 Dates. The seasons are defined as spring (march, april, may), summer (june, july, august),. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.

So as the northern hemisphere of earth begins to tilt away from the star, it means fall/autumn will begin on sunday, september 22. 2024’s autumnal, or fall, equinox will occur on sunday, sept.