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You can reseed a rundown lawn with dead grass, but first, you should remove all of the dead parts and test the soil. Doing this will help you understand what’s killing your lawn so that you can fix it and prevent it from ruining your new grass. Once you’ve made the appropriate adjustments, you can rake, fertilize, and reseed.

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.

When you don’t aerate your lawn, the soil will become more compact over time. This limits how much water can soak in to reach the roots of your grass, and it keeps oxygen and carbon dioxide from the plant roots. This can limit grass growth, which may sound great for limiting mowing, but it also leads to a lawn full of grass that looks dull and sparse. Eventually, compacted soil can weaken grass, while also making it more vulnerable to pests, diseases, and erosion and even causing it to die off.

Treating dry soil can bring back a dormant lawn, but not a dead one. After nurturing a dry lawn back to proper moisture levels, you should closely observe whether your grass revives with the soil. If not, you may need to reseed your lawn or start fresh with new turf.