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If you have a beautifully thriving yard with no bald spots, you can choose to aerate your yard once every two years. Otherwise, having your lawn aerated at least once a year is recommended. And in those circumstances where you have a significant amount of thatch buildup or a thinning and bald yard, it's best to aerate twice a year to maintain a healthy lawn.

Whether or not grass will fill in bare spots itself depends on the type of grass you have. For example, grass with rhizomes (e.g., Bermuda grass) and stolons (e.g., Saint Augustine grass) will naturally fill in bald spots as it spreads laterally. However, clump-forming grasses will not spread. 

Whether you’re putting down fresh seed or reseeding, there are a few things to keep in mind when seeding your lawn. Be sure to choose the correct seed for your climate, seed at the right time of year, and water two to three times a day for the first week. Generally, Dudley recommends seeding in spring and fall as it is usually cooler and rainier.

Several signs indicate that your lawn may require aeration. If you notice water pooling or runoff after rainfall, it suggests poor water infiltration, and aeration could help. Compacted soil may cause grass to thin out, turn yellow, or struggle to grow. Additionally, the presence of a thatch layer, which is a buildup of dead grass and debris, can indicate aeration is needed to alleviate thatch and promote healthier grass growth. Monitoring these signs can help you determine when your lawn would benefit from aeration.