But if your grass is healthy and thriving and hasn't been impacted by a lot of equipment or foot traffic, it likely doesn't need aeration. Once annually is usually enough in most cases, and for healthy lawns that receive regular maintenance and are performing well, every two to three years may be sufficient.

The time it takes for the holes to heal after aeration depends on the soil condition and the weather. Generally, it takes two to four weeks for the holes to heal completely.

Is lawn aeration necessary? Almost all lawns will benefit from aeration, and a great lawn demands it. That said, most lawns do not need it. Lawns suffering from heavy foot traffic, excessive thatch (>1 inch thick) or grown on heavy soils will benefit most.

There are two main types of lawn aeration — core aeration is one of the oldest methods of lawn aeration and involves creating physical holes in your lawn, while liquid aeration is a newer method that uses liquid to break up the soil.