Spring 2025 Dates Australia 2025. Spring equinox 2025 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic. An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length.

Spring equinox 2025 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic. Begins on sunday, september 1, and ends on saturday, november 30.