In Fairbanks, Alaska, spring happens almost overnight NPR | By Ravenna Koenig Published May 13, 2026 at 4:44 AM EDT LinkedIn Email Listen • 2:35 In many places, spring happens gradually. But in far-north Fairbanks, Alaska, birch and aspen trees often put their leaves out over a span of just 24-48 hours, a dramatic event known as "greenup." Copyright 2026 NPR