When Does Winter End 2025. What day does summer start? Starts on december 21, 2025, at 4:21 am and lasts until march 20, 2026, at 5:01 am (93 days) the times correspond to the eastern time (et) time zone and will vary in different states.
Daylight savings time will already have returned by the time. Winter solstice 2025 (beginning of astronomical winter) on the day of the winter (december) solstice, the sun passes through the southernmost point of the ecliptic, that is, as far as.