Autumn Equinox 2025 Date Usa. First day of autumnal in usa and uk, when is autumnal fall equinox in usa 2025? On the day of the winter (december) solstice, the sun passes through the southernmost point.
Spring begins with the vernal equinox, thursday, march 20, 2025, 5:01 a.m. Fall begins with the autumnal.