Spring Equinox 2025 Southern Hemisphere Time. The start of astronomical spring, known as the vernal. In 2025, the vernal equinox occurred on march 19, signaling the start of spring in the northern hemisphere (and fall in the southern hemisphere).

The night of tuesday, march 19 marks astronomical spring in the northern hemisphere and astronomical autumn in the southern. In 2025, the vernal equinox occurred on march 19, signaling the start of spring in the northern hemisphere (and fall in the southern hemisphere).