1 Ashland was ranked the top private college for teacher education in the state of Ohio by Online Education Database in 2012. 2  Educate to Career ranked Ashland a Top Best Value College in 2014.  U.S. News and World Report listed Ashland among the top 200 national colleges and universities in 2012 and 2013.
Autumn Foliage Color. The Process of Leaf Color Change. Leaves change color during the autumn because the amounts of pigments change as the leaves prepare to fall from the trees. All leaves gradually lose chlorophyll during the growing season, and this loss accelerates before leaf fall.
The tans and browns of oaks are caused by tannins which accumulate as the chlorophyll disappears. Fall color starts in September with poison ivy and sumac and ends in November with the larches and weeping willows. Frost and freezing temperatures will stop the coloration process and blacken the leaves. Source: Barbara Larson, Extension Educator, Horticulture. Morton Arboretum: Why Leaves Change Color.