How much grass seed do I need for half an acre?
Seeding half an acre from bare soil takes 174 lb of tall fescue (9 bags of 20 lb), 65 lb of Kentucky bluegrass, or 32.7 lb of Bermuda. Overseeding an existing lawn uses about half: 87 lb of tall fescue or 32.7 lb of bluegrass. The exact amount depends on the grass more than anything else.
Grass seed for half an acre by type
| Grass | New lawn | Overseeding | 20 lb bags (new) | 50 lb bags (new) |
|---|---|---|---|---|
| Tall fescue | 174.2 lb | 87.1 lb | 9 | 4 |
| Kentucky bluegrass | 65.3 lb | 32.7 lb | 4 | 2 |
| Perennial ryegrass | 174.2 lb | 87.1 lb | 9 | 4 |
| Fine fescue | 108.9 lb | 54.5 lb | 6 | 3 |
| Sun and shade mix | 130.7 lb | 65.3 lb | 7 | 3 |
| Bermuda | 32.7 lb | 16.3 lb | 2 | 1 |
| Zoysia | 43.6 lb | 21.8 lb | 3 | 1 |
Rates follow university extension recommendations for pure, uncoated seed. Coated seed is roughly half seed by weight, so double the amount if the bag says coated.
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Picking seed for half an acre
Tall fescue is the default for most of the country: deep roots, decent shade tolerance, and it establishes fast. Kentucky bluegrass makes the thickest northern lawn but needs full sun and twice the time to germinate. Perennial ryegrass sprouts in a week and is often blended in for quick cover. In the South, Bermuda and zoysia use a fraction of the seed per square foot but must be sown once soil tops 65 °F. At this size, price matters: 4 bags of 50 lb tall fescue at $100 to $150 each is $400 to $600, while bluegrass at 65 lb costs less in seed but more in water and patience.
Prep and supplies for half an acre
- Starter fertilizer: about 88 lb of a high-phosphorus starter, applied the same day as the seed.
- Straw or seed blanket: 22 bales of straw cover roughly half an acre at a bale per 1,000 square feet, or 23,958 square feet of erosion blanket on slopes.
- Topsoil: if the grade is low or the soil is poor, 2 to 4 inches of topsoil is 231.9 cubic yards at 3 inches. See the topsoil calculator.
- Water: half an acre needs about 3,376 gallons per light watering (1/4 inch), two or three times a day until germination. Check that your well or meter can keep up.
- Timing: late August to mid-September for cool-season grasses; late spring for Bermuda and zoysia.
Want it green this week instead of in six? Compare the cost of sod for the same area.
Common questions
How many pounds of grass seed for half an acre?
174 lb of tall fescue or perennial ryegrass, 65 lb of Kentucky bluegrass, 109 lb of fine fescue, or 32.7 lb of hulled Bermuda for a new lawn. Overseeding uses about half those amounts.
How many bags of grass seed do I need for half an acre?
9 bags of 20 lb or 4 bags of 50 lb for a new tall fescue lawn. For Kentucky bluegrass, 4 bags of 20 lb. Buy one extra bag for bare spots that show up in the first month.
How much does it cost to seed half an acre?
About $405 to $630 in tall fescue seed at store prices, plus $106 or so for starter fertilizer. Hydroseeding by a contractor runs about 10 to 20 cents per square foot, or $2,178 to $4,356 for this area.