When Will Fall Begin?

You're not the only one to pick up on the late-changing fall foliage. The federal government has noticed, too. An ecologist with the U.S. Geological Survey said fall remains a mystery, and it isn't clear what is causing trees to hold onto their color. Researchers at the NASA Goddard Space Flight Center partnered with Seoul National University in South Korea and used satellites to show the end of the growing season was delayed by six-and-a-half days from 1982 to 2008 in the Northern Hemisphere. The Geological Survey is working with NASA and the National Oceanic and Atmospheric Administration, watching the change of seasons from space, by focusing on Shenandoah National Park in Virginia.