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The best time to aerate a lawn is when there's plenty of moisture in the soil, which is the fall or spring seasons. However, keep in mind that lawn aeration isn't very effective when there has been a long period of heavy rain, as the excess water can potentially damage the lawn in the aeration process. Wait until your lawn is predominantly dry to start the aeration process to ensure best results.

Technically, yes—and you may have some successful growth—but this isn’t the ideal way to fill in sparse areas. By clearing leaves and debris, amending the soil, and aerating it properly before you lay the seeds, you’re providing the most ideal conditions for them to germinate.

Some grass types grow better than others on hard dirt. For example, hardy grass types like perennial ryegrass and Kentucky bluegrass will grow better on tough soil. Keep in mind that you should still consider your area’s climate when deciding on a grass type.

Raking only moves soil, leaves, and debris around on the surface. Aerating your lawn addresses compacted soil. Core aeration loosens up the soil, which makes it healthier and creates more verdant grass from the richer nutrients and stronger root systems that develop. Raking only provides short-term benefits, while aeration creates higher-quality soil and grass growth in the long term. Rake or dethatch before aerating for a bigger benefit to your lawn.