When Is 1st Day Of Spring 2025. In 2025, the official first day of spring is thursday, march 20. The spring equinox 2025 is thursday, march 20th.
This has the effect of making the days longer in the. The first day of spring (march equinox or vernal equinox) is when the sun shines directly on the celestial equator passing from south to north and the length of day and night are almost the same.
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