What is the best time of year to aerate and why? I have head and read Spring and Fall are good - and many use fall to aerate and seed - so the roots have room to grow in the newly created air space and water/nutrients/biology/food can get to the roots better. That said what about summer aeration? Like July. Are there benefits to doing it in July on fescue grass? Some say you can aerate anytime of year. Please tell use your experiences with aeration and improvements you have seen based on when you did the aeration.