Red Leaf, Yellow Leaf by Lois Ehlert. This is a great book about the life of a tree. The illustrations are amazing.
Fall Leaves Fall! By Zoe Hall. One of my favorites!! About two brothers playing in the leaves in the Fall time. Perfect to read after a day playing outside in the leaves.
Countdown to Fall by Fran Hawk. This is the perfect mixture of reading and looking at pictures. Countdown to fall from 10 and learn about different kinds of trees.
Mouse's First Fall by Lauren Thompson. Fantastic illustrations and a great book for the preschool age about a mouse who experiences Fall for the first time. This is a great book in a series of "Mouse's Firsts".
There Was an Old Lady Who Swallowed Some Leaves by Lucille Colandro! This is a great addition to the "There Was an Old Lady Who Swallowed a Fly" series. Just a funny, silly book to read. Older children will find it very funny.
Applesauce Season by Eden Ross Lipson. A story about a boys family who likes to make applesauce every year from apples at the farmers market. I make applesauce and various apple recipes every October from apples we pick at an apple orchard. I love to read this the night before we go.