How Much Grass Seed Do I Need?
Enter your lawn area and grass type to calculate how many pounds of seed to buy for new seeding or overseeding.
Grass Seed Coverage Rates by Type
| Grass Type | New Seeding | Overseeding | Climate Zone |
|---|---|---|---|
| Kentucky Bluegrass | 2–3 lbs/1,000 sq ft | 1–1.5 lbs | Cool season (North) |
| Tall Fescue | 6–8 lbs/1,000 sq ft | 3–4 lbs | Cool/transition zone |
| Fine Fescue | 3–5 lbs/1,000 sq ft | 1.5–2 lbs | Cool season, shade |
| Perennial Ryegrass | 8–10 lbs/1,000 sq ft | 4–5 lbs | Cool season, traffic |
| Bermuda Grass | 1–2 lbs/1,000 sq ft | 0.5–1 lb | Warm season (South) |
| Zoysia Grass | 1–2 lbs/1,000 sq ft | 0.5–1 lb | Warm season, transition |
| Centipede Grass | 0.25–0.5 lbs/1,000 sq ft | 0.1–0.25 lbs | Warm season (SE) |
Best Time to Seed Your Lawn
Cool-season grasses (Kentucky Bluegrass, Fescues, Ryegrass) germinate best when soil temperatures are 50–65°F. That means early fall (late August through October) is the best seeding window in most Northern states. Spring seeding (April–May) is the second-best option. Avoid summer seeding — heat stress and competition from annual weeds make establishment difficult.
Warm-season grasses (Bermuda, Zoysia, Centipede, St. Augustine) germinate when soil temperatures reach 65–70°F. Late spring through early summer (May–July) is the prime seeding window in Southern states. Fall seeding of warm-season grasses usually fails — the grass doesn't have time to establish before winter dormancy.
Soil temperature is more important than air temperature. A thermometer inserted 2–3 inches into the soil is the most reliable guide. Most garden centers carry inexpensive soil thermometers.
New Lawn vs. Overseeding
New seeding starts from bare or heavily prepared soil. The full seeding rate applies. Requires soil preparation (tilling, grading, removing old lawn), starter fertilizer, and consistent watering 2–3 times daily until germination (typically 7–21 days depending on grass type).
Overseeding introduces new seed into an existing lawn to thicken thin areas, improve density, or introduce a better-performing variety. Use roughly half the new seeding rate. For best results, mow the existing lawn short (1–1.5 inches) before overseeding, core aerate to improve seed-to-soil contact, and keep the seeded area moist until germination.