White grubs are the larvae of various beetles, including Japanese beetles and May/June beetles.  White grubs can be found in all counties in Ohio.  Some years the infestation is worse that in others.  If you have had problems with white grubs in the past, you may want to put down a preventative treatment before mid June. Otherwise, a healthy lawn can sustain an infestation of moderate populations of insect pests (6-8 per square foot) without extensive impact on health or appearance. See the link below for more info:
https://www.canr.msu.edu/news/how_to_choose_and_when_to_apply_grub_control_products_for_your_lawn
This link is from Michigan State but will apply to your Ohio lawn.