Astronomical springs starts today, March 20, at 1:44 PM.
According to the astronomical definition, spring begins on the Vernal Equinox (usually March 20 in the Northern Hemisphere, and September 22 in the Southern Hemisphere), and lasts until the summer solstice (usually June 21 in the Northern Hemisphere and December 21 in the Southern Hemisphere).
In 2009, spring fell on March 20 in the Northern Hemisphere.