When Does Spring Start?


Quick Answer

Spring starts when the vernal equinox occurs, which is usually on or around March 21. An equinox is a date when night and day are exactly the same length. Two occur during the year, one signaling the beginning of spring and the second signaling the beginning of autumn.

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Full Answer

Weather forecasters do not use the vernal equinox to define the start of spring. They use the period in which temperatures begin to rise. This three-month period includes March, April and May. During this period rainfall increases, buds grow and deciduous trees regain their leaves. Animals also end their winter hibernations and enter a period in which many births take place.

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