Fall Equinox 2025 Dates Usa. Starts on december 21, 2025, at 4:21 am and lasts until march 20, 2026, at 5:01 am (93 days) It’s bringing summer to the southern hemisphere and winter to the northern hemisphere.
Equinox means equal day and night (12 hours each).it is a time for balance. The autumnal equinox, or the first day of fall in the northern hemisphere takes place every year on september 22nd or september 23rd.