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At 2 a.m. on the second Sunday in March, we set our clocks forward one hour ahead of Standard Time (Spring forward, even though Spring doesn't begin until late March, over a week after the start of Daylight Saving Time).
When does spring start? How you define the first day of spring depends on whether you follow the astronomical or meteorological seasons. This year, spring will take place between March 20 and June 21, if you use the astronomical method. But it starts slightly earlier, between March 1 and May 31, if you follow the meteorological calendar.