Lawn Seed for Half an Acre
Free calculator with pre-filled dimensions • Updated March 2026
A half-acre new lawn needs 44–174 lbs of seed — about $523–$697 depending on grass type.
Open calculator with these dimensions →Seeding Half an Acre
Half an acre (21,780 sq ft) is a large lawn project. At this scale, buying seed in bulk (25-lb or 50-lb bags) saves significantly over small bags. A slit-seeder rental is practically mandatory — hand broadcasting over half an acre is inconsistent and wasteful.
Seed Requirements
| Grass Type | New Lawn (lbs) | Overseeding (lbs) | Cost |
|---|---|---|---|
| Tall Fescue | 130–175 lbs | 65–90 lbs | $200–$350 |
| Kentucky Bluegrass | 44–65 lbs | 22–33 lbs | $175–$400 |
| Bermuda | 44–65 lbs | 22–33 lbs | $130–$260 |
| Sun/Shade Mix | 90–110 lbs | 45–55 lbs | $180–$330 |
Pro Tips for Large Lawns
- Buy contractor-grade seed. At 100+ lbs, ask your local farm supply store for 50-lb contractor bags. They're 30–50% cheaper per pound than retail bags and often higher purity (less weed seed and inert matter).
- Divide and conquer. Split the area into 4 quadrants. Seed one direction, then cross-seed at 90 degrees for even coverage. Use half the recommended rate each pass.
- Consider hydroseeding for half an acre. Professional hydroseeding costs $0.06–$0.10/sq ft ($1,300–$2,200 for half an acre) and combines seed, mulch, fertilizer, and water in one application. Especially effective on slopes.
Frequently Asked Questions
How much seed for half an acre?
For a new lawn, 90–175 lbs depending on grass type. Overseeding an existing lawn uses half that amount. Buy 50-lb contractor bags from a farm supply store for the best price.
Should I seed or sod half an acre?
Seed is dramatically cheaper — $140–$440 vs. $8,700–$17,400 for sod at half an acre. However, seed takes 4–8 weeks to establish. Consider sod for visible front areas and seed for the larger backyard.