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You can thicken new grass by using fertilizer, watering it 1 to 1½ inches per week, mowing when it is at an optimal height, and preventing weeds. You should fertilize your grass while you plant the grass seed, or soon afterward. Use an herbicide to prevent weeds or spot spray with herbicide to kill existing weeds.

If your lawn and general landscape are struggling, consider calling a local landscape specialist to suggest lawn amendments, local plants, and hardscape changes to boost the long-term health of your outdoor space. While you may be able to take on small projects yourself—such as reseeding your lawn or testing the soil—a professional can help you build a plan to bring a struggling yard back to life quickly.

The average cost to seed or reseed a lawn is about $1,100, with prices typically ranging from $450 to $1,700. The final cost depends on factors like your lawn size, the type of seed used, and local labor rates. On a per-square-foot basis, you can expect to pay between $0.10 and $0.20.

Here are some cost estimates based on lawn size:

• 500 square feet: $50–$100

• 2,000 square feet: $200–$400

• 4,000 square feet: $400–$800

• 5,000 square feet: $500–$1,000

• 1 acre: $3,000–$5,880

• 2 acres: $6,000–$11,760

• 5 acres: $15,000–$17,640

Popular seed types for residential lawns include bahia, fescue, and Bermuda. Compared to installing sod, seeding is generally a less expensive option, especially for larger areas.

Additional services can add to the total cost:

• Fertilization: $80–$400

• Soil testing: $700–$2,100

• Yard cleanup and leaf removal: $200–$560

• Weed treatment: $110–$325

• Mowing: $50–$210

Aerating a lawn before seeding it or adding new grass seed is a smart decision. By loosening up compact soil and allowing it to take in more air and water, your seeds will have an easier time establishing roots and growing. Aerating beforehand also means your seeds will have better contact with the soil, so more of your seeds have a chance to germinate. If you do plan to aerate your lawn before seeding, aerate about two days before you plan to start seeding.