The answer to 'how often to aeration' is that most lawns should be aerated once per year, typically in the fall. Aeration is the process of punching small holes in the soil to allow air, water, and nutrients to better reach the grass roots. This helps alleviate soil compaction and promotes a healthier, thicker lawn.
Aeration is especially beneficial for clay-heavy soils that tend to become compacted over time. Compacted soil makes it difficult for grass roots to grow and thrive. Annual aeration helps break up the soil and allows your lawn to absorb more of the water, oxygen, and nutrients it needs.