Search Britannica 0 Entertainment & Pop Culture Geography & Travel March 20, 2022 First of Spring Toss that hot beverage; put away YOUr sweaters, and bri= oul the sandals. Spring officially starts on March 20 wit the arrival of the vernal equinox in the Northern Hemisphere: This means longer days, warmer weather; growing plants; and mating animals. The Transition from Winter Cold Summer Heat Article Science Day