Asked June 21, 2021, 3:54 PM EDT
Washington County Minnesota
Thank you for writing and for the pictures.
You need to peel off the top of the turf to look for grubs. Let me know what you find.
There are japanese beetles and chafer beetles. Different months. https://extension.umn.edu/yard-and-garden-news/fall-turf-grass-problems-grubs-might-be-culprit
I need a close up of the grub if you find one.