The impact of lawn rollers on your yard can be both beneficial and detrimental, depending on how and when they are used. For instance, after seeding a new lawn or laying sod, a light pass with a roller can help improve soil contact and moisture retention, aiding in establishing new grass. However, using a lawn roller too often or too heavily can cause soil compaction. This compaction can make it difficult for grass roots to penetrate the soil and access water and nutrients, leading to less healthy and robust lawns.