When The First Day Of Spring 2025. The celestial event signifies the first day of winter, astronomically. The spring equinox is tuesday, march 19 and brings the first day of astronomical spring to the northern hemisphere.
First day of spring in 2025 is on tuesday, the 19th of march (19/3/2025). Spring will last from march 19 until june 20, when summer officially starts in 2025.