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The astronomical beginning of spring in 2009 as defined by the International Astronomical Union was March 20 at exactly 7:44 AM. ET. This March date will vary by a day or two other years. However, there is no one "official" date that carries the sanction of law like the days, months, and years that are the official calendar based units of time. The World Meteorological Organization designates March 1 as the beginning of the climatological spring. Many ecologists consider that spring begins with the start of the growing season, a date that varies from one region to another and can shift from one year to the next.

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14y ago

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