The best time to aerate and seed your lawn depends on the type of grass you have. Seeding outside of these windows can lead to poor germination or weak root development, especially if temperatures are too hot or too cold. For the best results, we also recommend pairing aeration and seeding with proper watering and fertilization tailored to your grass type.
For cool-season grasses (like fescue, Kentucky bluegrass, and ryegrass), the ideal time is early fall (September to October). The soil is still warm, but the air is cooler—perfect conditions for seed germination and root development. Spring (March to early May) is also a viable option, though fall typically yields better long-term results. For warm-season grasses (like Bermuda, zoysia, and centipede grass), the best time is late spring to early summer (May to June), when these grasses are actively growing. Aerating and seeding during this time gives new grass the full growing season to establish.