Welcome Spring With This Psychedelic Map of the U.S. in Bloom

Here on the East Coast, it's finally feeling like spring. And the good scientists at the U.S. Forest Service are offering proof of this miracle via the satellite-tracking tool ForWarn—mapping in glorious Technicolor the beginning of seasonal greening, or "greenup," across America's forests, fields, and urban areas.

It's important to note that greenup doesn't always mean "spring," since some climates and plants don't have the traditional four seasons. But greenup does indicate the transition of one season to another, between January and June. The map above shows the median greenup date from the last 14 years of millions of pinpointed locations nationwide, based on satellite imagery.