Fertilizing: Both spring and fall are good times to fertilize your lawn. In the northern third of the country, where winters are cold, fertilize in fall — cool weather grasses go dormant over winter and store energy in their roots for use in the spring.
For the rest of the country, apply fertilizer just as your grass begins its most active growth. For best results, closely follow the application directions on the product. You’ll spend about $50 to $75 per application for an average 1/4-acre lot.
Aeration: Aerating punches small holes in your lawn so water, fertilizers, and oxygen reach grass roots. Pick a day when the soil is damp but not soaked so the aeration machine can work efficiently. Read More about lawn aeration.