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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.

Don’t pick up dirt after aerating. Even though it's tempting because soil cores are incredibly unsightly, these cores and the dirt they leave behind are ecologically important. This is what keeps your grass looking beautiful and growing healthily. The soil cores need two to three weeks to decompose, but you can swat them with a rake if their natural shape bothers you.

Don't pick up or dispose of aeration plugs. They will break down by themselves in one or two weeks. Rainfall will speed this up, as will watering the lawn. Mowing helps, but don't mow the grass too soon post-aeration. It's unusual that the plugs would remain after three or four weeks, but mowing and raking will break them down by that point.

Yes! Aerating your lawn during its dormancy period—usually over winter and early spring—can cause a disturbance that the grass may not easily recover from. Instead, you should aerate your lawn during its peak growth period, usually in the late summer or early fall (though with some variation based on specific grass type).