The following sites can help you identify fall leaves:

  • Audubon Field Guides Register for free access to all the field guides.   Then select the tree icon.  The Guide to North American Trees is completely interactive with over 800 species of trees found in North America north of Mexico, covering species of the continental United States and Canada.
  • Common Trees of Pennsylvania Sponsored by the PA Department of Conservation and Natural Resources, this site is organized according to leaf shape and arrangement. Choose from the list of names of 57 native trees and 5 trees introduced to PA to identify your leaf.
  • Guide to Common Trees of Pennsylvania Match your leaf to the botanical drawings on Cook Forest Online.
  • Take a Walk in the Forest and identify several trees from their leaves in an interactive game from the National Zoo.
  • 4- H Leaf Identification Project Examine your leaf carefully, then answer a series of questions to discover what leaf you have.
  • Fall Color Guide Identify your leaf by fall color and shape in this guide from the University of Tennessee.
  • Leaf Tree ID Key Identify your leaf through a series of pictures provided by the Wisconsin Center for Environmental Education or find out more about your leaf by searching a tree name.
  • Temperate Deciduous Forest This mini-guide sponsored by the Missouri Botanical Gardens will help you identify particular trees by the shape of their leaves. Find out more facts about the temperate deciduous forest by going to the site’s home page.
  • Tree Identification Key Answer a series of questions or look carefully at color photographs of leaves to identify your leaf on this site from the Michigan State University Extension.
  • What Tree Is It? Designed by the Ohio Public Library and Information Network, this site enables you to identify a tree by the name of a tree, the type of fruit it bears, or its leaf.
  • What Tree is That? Select a leaf type, then answer questions to discover its identity with this interactive game from the Arbor Day Foundation. View all the trees and use the tree identifier on the online edition of What Tree is That
  • A site sponsored by Garden Buildings Direct includes quite a few links that can help with tree identification: What Tree Is It?