Find trees that thrive in northern Illinois. Select your location, site conditions, and preferences to get a side-by-side comparison for choosing the best tree for your circumstances. All trees found on the Northern Illinois Tree Selector are hardy for zones 5 and 6. Search results appear alphabetically by scientific name. If no results appear for your search criteria, click "refine search" and deselect criteria for broader results. Email us at firstname.lastname@example.org with questions or comments.