= Q Britannica Login Search Britannica . Entertainment & Pop Culture Geography & Travel March 20, 2022 First of Spring Toss that hot beverage; put away YOur sweaters, and bring out the sandals Spring officially starts on March 20 with the arrival of the vernal equinox in the Northern Hemisphere: This means longer warmer weather; growing plants, and mating animals_ The Transition from Winter Cold Summer Heat Article Science ' ! 7" :'| |':' (1 Day days;