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When stored under ideal conditions, grass seed lasts anywhere from 10 to 18 months from the testing date without any real decrease in the germination rate. You can still use the seeds after this timeframe, but the germination rates drop 10% to 20% each year. 

If you’re just embarking on an overseeding project, using seeds that have been in storage for a few years isn’t too big of a deal. However, if you’re planning on redoing your entire landscape, your best bet for a healthy, luscious lawn is to use new seeds.

No, it's not a good idea to put grass seed directly on top of dead grass. For successful germination and growth, grass seed needs good soil contact. To prepare the area, start by removing the dead grass using a shovel or a sod cutter. Then, loosen the soil, add soil amendments if necessary, and spread the grass seed evenly. This allows the seed to come into direct contact with the soil, promoting better germination and establishing a healthier lawn.

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

Yes, you can overseed your lawn without aerating it, but results may vary. If you have the time, dethatching or aerating your lawn before overseeding will yield the best results. Overseeding your lawn without aerating will work, but less seed will take root. For the best possible results, aerate your lawn before overseeding it.