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Mow before aeration. After you've aerated the lawn, you can fertilize, water, and overseed. But wait at least two weeks after aeration before you mow.

Depending on the lawn treatments, the best times of the year to redo your lawn are between mid-August and mid-September for overseeding and renovation treatments. For areas such as the southern United States, lawn aeration works best during the fall, when the temperatures begin to drop. Otherwise, early spring is your next best bet because the grass is fresh and ready to absorb nutrients, and the temperature isn’t hot enough to fry the grass and the renovation materials.

Aerating a lawn before seeding it or adding new grass seed is a smart decision. By loosening up compact soil and allowing it to take in more air and water, your seeds will have an easier time establishing roots and growing. Aerating beforehand also means your seeds will have better contact with the soil, so more of your seeds have a chance to germinate. If you do plan to aerate your lawn before seeding, aerate about two days before you plan to start seeding.

Short answer: yes. Although aeration is beneficial for most lawns and soil types, if it’s done too frequently, you can weaken the grass’s roots so much that they’ll begin to have trouble. Generally, most lawns can be aerated as infrequently as once every one to three years, although those with more foot traffic and compaction may benefit from aeration up to twice yearly.