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The length of time it takes to aerate a lawn mostly depends on the yard's size. Generally, a lawn care professional can aerate a lawn that is 10,000 square feet in size in about 30 to 45 minutes. This process may take additional time if you have a heavily sloped or uneven yard, and it may cost extra for the lawn care pro’s labor and time.

Experts recommend aerating a lawn at least once a year. If you haven’t aerated your lawn recently, or if it has a significant amount of thatch buildup, you may need to aerate it twice annually for a few years. Keeping up with a regular aeration schedule helps ensure the long-term health of your yard.

Don’t pick up dirt after aerating. Even though it's tempting because soil cores are incredibly unsightly, these cores and the dirt they leave behind are ecologically important. This is what keeps your grass looking beautiful and growing healthily. The soil cores need two to three weeks to decompose, but you can swat them with a rake if their natural shape bothers you.

When you don’t aerate your lawn, the soil will become more compact over time. This limits how much water can soak in to reach the roots of your grass, and it keeps oxygen and carbon dioxide from the plant roots. This can limit grass growth, which may sound great for limiting mowing, but it also leads to a lawn full of grass that looks dull and sparse. Eventually, compacted soil can weaken grass, while also making it more vulnerable to pests, diseases, and erosion and even causing it to die off.