Giovanni McFarlane, left, and Charli Richards correctly count the rings of a tree outside Walt Whitman School in Wheeling.

Bill Zars | Staff Photographer

Third-graders sing as Walt Whitman School marks Arbor Day on Friday in Wheeling.

Bill Zars | Staff Photographer

Frank C. Whiteley School third-graders, from left, Michaela Vall, Ashley Scesniak and Kailey Mleko help Mayor Bill McLeod at Arbor Day Park in Hoffman Estates.

Bob Chwedyk | Staff Photographer

Hayden Kim shovels some dirt on a freshly planted tree at Arbor Day Park in Hoffman Estates.

Bob Chwedyk | Staff Photographer

Kindergartners Kyla Healy and Brayan Perez-Sanchez shovel some dirt as they celebrate Arbor Day at the Early Learning Center in Des Plaines.

Bill Zars | Staff Photographer