There are many things that can cause bare spots in a lawn, from dog urine to the ravages of winter. It's easy to remedy those bald spots and sunshine, heat and moisture are all that's needed. Temperatures should be in the 60-degree F range in the daytime and above 45 degrees F at night. If you aren't sure what type of grass you have, ask local landscapers or take a sample to the county extension office. Plan to plant grass seed in the spring or fall.
Mow the lawn on the lowest setting of your mower.
Remove any debris or weeds in the patch will be seeded.
Break up the soil in the patch with a shovel or rake.
Spread the grass seed over the patch until it is completely covered with seeds.
Spread a 1/4-inch layer of soil over the top of the seeds and pack it down by hand.
Water the patch with enough water to moisten it, not soak it. Never let the seeds dry out.