Most years, the spring equinox falls between March 20 and 22. But for those in the United States, not this year. In fact, space.com reports that the March 19 equinox is earlier than any in the past 124 years.
Perhaps the early equinox is fitting in a year during which springlike weather arrived weeks in advance in many parts of Lower 48. The USA National Phenology Network, which tracks the timing of plants, reported that trees were leafing up to three to four weeks early in many parts of the southern and eastern United States due to the mild weather, starting in February.