Fall 2024 In Canada Months. When do the four seasons start in 2024—for spring, summer, fall, and winter? In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.

Here’s everything you should know about the fall equinox—plus our favorite fall facts, folklore, photos, and more! Fall starts at the moment when the sun is directly over the equator, going from north to south: