The best time for lawn fertilization is in the fall, typically between September and November. This is the optimal time because the grass is actively growing and can absorb the nutrients from the fertilizer, helping to thicken the lawn and prepare it for the winter months.
Applying fertilizer in the fall also helps to strengthen the grass's root system, which is crucial for maintaining a healthy, lush lawn throughout the year. Additionally, fall fertilization can help prevent weed growth and improve the overall appearance of your lawn.