Hi James

Right now (April-May) here are your options

Curative , kills active grubs-

Granular trichlorfon 9.3% —Apply in spring or fall to active grubs.

Preventative, prevents grubs later in the season

• Products containing chlorantraniliprole 0.08%
  Apply between April 1 and May 30 (no later than July 15) for best results.
• Granular products containing imidacloprid 0.25%

Here is an article that explains all the details. MSU Extension does not endorse brands or retailers. The article mentions some brand name products as examples. These examples may still be on the market. There are others. Please read the label and choose a product that has one of the active ingredients specified in the article, for dat time frame explained in the article.

https://www.canr.msu.edu/news/how_to_choose_and_when_to_apply_grub_control_products_for_your_lawn

And please read and follow all precautions and directions on the label of whatever product you use.