Early fall marks a peak feeding time for grubs as they fatten up before winter. Once soil temperatures drop, grubs dig in, heading 4 to 8 inches below ground, where they’ll stay snug until spring. That means early fall – before temperatures tumble – is a key time to go after grubs, and as a result you can help prevent some of the most common lawn problems before they start.
In spring, when grubs emerge from soil, they don’t feed much, making spring grub control less effective. Lawn damage you see in spring actually occurred the previous fall, which makes fall control even more important. Stop grubs in the fall, and you can dramatically limit lawn damage.