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Yes, you can overseed your lawn without aerating it, but results may vary. If you have the time, dethatching or aerating your lawn before overseeding will yield the best results. Overseeding your lawn without aerating will work, but less seed will take root. For the best possible results, aerate your lawn before overseeding it.

The best time of year for power seeding depends on your local climate. The soil should be warm, but the air should be cool. If the weather gets too hot after you grow new grass seed, it can die off easily. The best time for power seeding warm-season grasses is late spring to summer, and the best time for power seeding cool-season grasses is in the fall.

Although these terms sound similar and are sometimes used interchangeably, overseeding and reseeding your lawn are very different processes. Overseeding, the simpler of the two, involves a few steps to restore thinned or patchy grass by raking, aerating, and seeding uneven areas of turf to promote regrowth.

Reseeding a lawn is a more drastic and involved process, often necessary if the lawn is diseased, more than a third dead, or very overgrown with weeds. Unlike overseeding, it requires removing most of the existing lawn and starting a new one from scratch, a much bigger and more time-consuming job.

If you use a starter fertilizer designed for this purpose, you can overseed and fertilize at the same time. If you opt to use a fertilizer for established grass or one with a weed control component, it's best to wait at least four to eight weeks after seed application to allow the new grass to take hold and establish itself.