Rake the bare spots in the lawn to remove dead grass and debris.
Aerate the soil with a pitchfork. Dig down at least 1 inch to turn the soil over.
Moisten the soil with a garden hose so that it's slightly damp.
Incorporate a fertilizer into the soil with the pitchfork.
Spread new grass seed into the soil. Use a grass seed appropriate for the climate. Approximately eight seeds every square inch is a reasonable amount.
Moisten the soil again as soon as you seed.
Keep the newly fertilized and seeded spots moist. Spraying the seeds three times a day with a mist of water is appropriate until the grass reaches approximately 1 inch in height.
Water the new grass once a week until it attains a height of 4 inches.