In New Jersey, the best time to aerate your lawn is typically during the early fall, specifically in September or early October. During this period, the soil is still warm, and there's usually adequate moisture, which helps the grass recover quickly from aeration. Aeration allows better air, water, and nutrient penetration to the grassroots, promoting healthier and lusher growth. However, it's essential to monitor local weather conditions and soil moisture levels to ensure optimal timing, as exact timing may vary slightly based on regional climate and soil conditions.