Reseeding your lawn should be a yearly process to encourage even growth and to fill in any bare spots. It is best to reseed your lawn in early spring, several weeks after the first frost, or in early fall before the first frost. Two weeks before you reseed, apply a liquid lawn fertilizer to your entire yard. Purchase high quality grass seed, and research the type of grasses that grow best in your area, carefully considering the amount of sun the patches you will be filling receive.
Mow your lawn shorter than usual, cutting it down to about 1 inch to ½ inch in length.
Thoroughly rake the areas in which you will be reseeding. Remove all debris and grass clippings.
Mix the grass seed with an equal amount of top soil. Spread the seed and soil mixture evenly across your bald patches.
Gently place a thin layer of straw on top of the newly seeded areas. This will prevent the seeds from blowing away.
Thoroughly water your seeds, and continue to keep the soil moist during germination.