No, it’s not necessary to aerate your lawn every year, especially if your grass is healthy and thriving. Aeration is good if you’ve got compacted, poor or clay-heavy soil that’s been impacted by heavy equipment or lots of foot traffic. It’s also good to aerate if you are renovating a yard or installing a new one.Click to see full answer. People also ask, does aerating lawn make a difference? Why Aerating Helps Lawns A layer of compacted soil just 1/4 to 1/2 inches thick can make a significant difference in the health and beauty of your lawn. 1 Aeration creates holes down into the soil to alleviate compaction so air, water and nutrients can reach grass roots. how do you aerate your lawn? Aeration involves perforating the soil with small holes to allow air, water and nutrients to penetrate the grass roots. The best time for aeration is during the growing season, when the grass can heal and fill in any open areas after soil plugs are removed. People also ask, how often should a lawn be aerated? As for frequency, Friell said aeration should be performed at least once per year on most lawns, while twice annually is best for lawns with compacted soil or soil with high clay content.What do you do after you aerate your lawn? What to Do After Aerating Your Lawn Leave the soil plugs on the lawn to decompose and filter back into the holes left by the aeration machine. Apply fertilizer immediately after aerating your lawn to put nutrients into your grass roots. Reseed your lawn, especially in areas of the lawn where the grass is thin.