Sow your grass seed in either the spring or fall. Fall is the best time to plant new grass because there are not as many weeds growing and the nights are getting longer, which help the soil retain more moisture.
Rake the surface of the area you will be planting in to loosen up the soil. Remove any large rocks, sticks or other debris you come across while raking.
Pour a 20-pound bag of topsoil into a wheelbarrow. Use a shovel to break apart any clumps that are in the soil. Put one to two handfuls of grass seed in the wheelbarrow with the soil. Mix the two together with your shovel.
Shovel the soil and seed mixture on the ground where you wish to grow grass. Either sprinkle it over the ground from the shovel or place a few mounds of the mixture on the ground and then spread it evenly with a rake. Continue doing this until the entire area you wish to grow grass in is covered with the mixture.
Water the grass seed two to three times per day. Do not let the grass seed dry out. Amount of water needed will vary depending on temperature, wind and shade. Warmer and windier locations need more water. Shadier areas will not need as much water as sunnier areas.
Continue watering the grass seed for two to three weeks while it germinates. Once the grass seed has germinated, you may begin performing regular lawn maintenance.