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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.

Adding seed to existing grass is often known as overseeding, as opposed to reseeding. Reseeding refers to the process of filling in bare or dying patches of lawn—or in some cases, full lawns—whereas reseeding supports existing lawns to prevent thinning. Overseeding is an ideal annual lawn care practice for grass fighting drought, disease, weeds, or pest issues.

If your lawn has some lumps and bumps, yes, aeration can help—although it may also be beneficial to take on other steps, like irrigation, fertilization, and dethatching (also known as scarifying). You can also use a power rake to physically break up the bumps in your lawn, which can help you achieve a more even look.

There are a few time periods or conditions during which you should avoid aerating your lawn. For example, do not aerate when the ground is frozen or waterlogged, as it can damage the soil structure and grass roots. Aerating during the peak of summer heat or drought is also not recommended since it can stress your grass further. It's best to wait for cooler, more favorable conditions. Finally, newly seeded lawns should not be aerated until the grass is well-established, usually at least one year after seeding.