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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.

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.

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.

Aerating a newly sodded lawn is generally not recommended immediately after installation. It's crucial to allow the sod to establish itself first, typically over the first growing season. Aerating too soon can disrupt the fragile root systems of the newly laid sod and potentially damage the turf. It's best to aerate prior to laying new sod or wait until the sod has fully rooted and the lawn is stable before considering aeration, usually after the first year.