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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.

No. Both processes are important for a healthy yard and work toward a similar goal, although dethatching serves a slightly different purpose. Making sure the thatch doesn’t grow too thick prevents other lawn problems, such as attracting pests if the plant decay layer gets too big. Aeration puts less strain on your lawn than dethatching, but both are of equal importance.

Yes, after the lawn is overseeded post-aeration, most of the seed germinates in the aeration holes. This leaves the soil undisturbed while lush and healthy grass will grow in the holes' place. The point of this is to create extra turf density in areas that really need it, such as a large patch of dead grass where a shed used to be.

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.