Compacted soil does not let your grass develop a good root system. Such soil does not absorb adequate water. Aerating your lawn in the early spring and early summer treats this problem. Use a core aerator that pulls plugs of dirt out of the soil, loosening it and providing air circulation.
Grass needs food. Feed it with a treatment of high-nitrogen fertilizers between September and mid-October. This helps it survive the winter and increases the speed with which it grows next spring.
Weeds steal nutrients from your lawn. Giving your lawn regular treatments of weed killer prevents this problem. Follow the treatment schedule the manufacturer provides.
If your lawn's soil is high in clay, it does not have adequate drainage and becomes waterlogged. Covering your soil with approximately 2 inches each of sand and organic material remedies this situation. Mix them in to a depth of about 9 inches. Give this treatment before planting your lawn.