First Day of Seasons: 2012 and 2013 (yesterday)

When Do Summer, Fall, Winter, and Spring Begin?

NASA

See chart below to see when seasons begin for 2012 and 2013—namely, the summer solstice, fall or autumnal equinox, winter solstice, and spring or vernal equinox.
The four seasons are determined by changing sunlight (not heat!)—which is determined by how our planet orbits the Sun and the tilt of its axis.

• The first day of summer—the summer solstice—is the longest day of the year, the Sun reaches its most northern point in the sky at local noon. After this date, the days start getting shorter. See our First Day of Summer page!

Seasons of 2012:
SPRING EQUINOX	March 20, 1:14 A.M. EDT
SUMMER SOLSTICE	June 20, 7:09 P.M. EDT
FALL EQUINOX	September 22, 10:49 A.M. EDT
WINTER SOLSTICE	December 21, 6:12 A.M. EST

Seasons of 2013:
SPRING EQUINOX	March 20, 7:02 A.M. EDT
SUMMER SOLSTICE	June 21, 1:04 A.M. EDT
FALL EQUINOX	September 22, 4:44 P.M. EDT
WINTER SOLSTICE	December 21, 12:11 P.M. EST

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