His real name is Jeff Folger, but in the world of extreme leaf peepers — those who won’t settle for anything less than postcard-perfect — he is known by a title that is both a tribute and an obligation. They call him Jeff Foliage, the “arboreal oracle.”

And when the colors of fall begin their annual explosion across New England, the peak geeks and the media and the state tourism boards all want the same thing from Jeff Foliage: Where, oh where, they say again and again, is the peak foliage? And where will it be tomorrow?