First Day Of Seasons New! Jun 2026

(Southern hemisphere dates are opposite seasons.)

Meteorologists and climatologists find the astronomical dates a bit messy because they change slightly every year (falling between the 20th and 23rd). To keep records consistent, they break the seasons into three-month blocks based on the annual temperature cycle: Spring: March 1 Summer: June 1 Autumn: September 1 Winter: December 1 Spring: The Vernal Equinox first day of seasons

You might notice that the first day of a season isn’t on the same date every year. This is because a "year" isn't exactly 365 days; it actually takes the Earth about 365.242 days to orbit the sun. Our calendar accounts for this with Leap Years, which causes the astronomical timing of the solstices and equinoxes to drift slightly between the 20th and 23rd of their respective months. (Southern hemisphere dates are opposite seasons