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The exact moment in which spring begins happens at 12:30 a.m. Eastern time on Sunday, March 20. This means that residents in Central, Mountain and Pacific time zones have spring begin on Saturday, March 19. People in Central time will observe the start of spring at 11:30 p.m. CT, and spring will begin at 10:30 p.m. for those in Mountain time. Spring will start on Saturday at 9:30 p.m. for those in Pacific time.