The United States recently experienced its warmest March on record, with average temperatures soaring 7 degrees above normal, triggering an early emergence of leaves and flowers across numerous regions. Data from the USA National Phenology Network indicates that leaves appeared two to four weeks earlier than usual in Central and Western states, affecting approximately 190 million people. Cities like Denver, Salt Lake City, and Baton Rouge reported record early leaf-out, while Wichita and Oklahoma City experienced record early blooms. This phenomenon is attributed to the exceptionally warm March, with temperatures in parts of the Southwest exceeding averages by more than 15 degrees.