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If you have a beautifully thriving yard with no bald spots, you can choose to aerate your yard once every two years. Otherwise, having your lawn aerated at least once a year is recommended. And in those circumstances where you have a significant amount of thatch buildup or a thinning and bald yard, it's best to aerate twice a year to maintain a healthy lawn.

Power seeding machines do a great job of creating narrow trenches in the soil to plant grass seeds into, but aerating before power seeding can be beneficial for your lawn. By aerating first, more water, oxygen, and carbon dioxide can reach the roots of your germinating grass seeds. Plan to aerate your lawn about once or twice a year, whether you plan to power seed or not.

Aeration can level your lawn if the issue is minor soil compaction, so it can help smooth things out if your yard is bumpy from foot traffic or vehicle traffic. However, it won’t slope your yard. If you have small areas where water seems to pool after precipitation, aeration could help, but larger issues with improperly sloped lawns and problems leading to foundation leaks or structural damage will require more comprehensive solutions.

Experts typically recommend aerating your lawn about once per year, but your aeration frequency will depend on your soil type, lawn condition, and other factors. For instance, you should aerate annually if you have clay-heavy soil or frequent foot traffic in your backyard. However, if your soil is loose or sandy and you don't use your yard often, you can probably aerate every other year.