Question 1

How much grass seed do I need?

Accepted Answer

Seeding rate depends on grass type and whether you are starting new or overseeding. Kentucky bluegrass: 2-3 lb per 1,000 sq ft new (1-2 overseed). Tall fescue: 6-8 (3-4). Perennial rye: 5-9 (4-6). Bermuda (hulled): 1-2 (0.5-1). The calculator covers seven common types.

Question 2

When should I seed my lawn?

Accepted Answer

Cool-season grasses (fescue, ryegrass, bluegrass): late summer through early fall is best (warm soil, cool air, less weed competition). Warm-season (Bermuda, Zoysia, Bahia): late spring through early summer when soil is 65 F+.

Question 3

What is the difference between new lawn and overseeding rates?

Accepted Answer

New lawns need full coverage from seed alone, so rates are roughly double overseeding rates. Overseeding adds seed to an existing lawn to thicken it; the existing turf does most of the work, so less seed is needed per area.

Question 4

How long does grass seed take to germinate?

Accepted Answer

Ryegrass: 5-10 days. Bermuda: 7-21 days. Tall fescue: 7-14 days. Kentucky bluegrass: 14-30 days (slow). Keep the seedbed consistently moist (not soaked) for the full germination window. Water lightly twice a day until established.

Question 5

Should I use a starter fertilizer?

Accepted Answer

Use starter fertilizer only when a soil test, the product label, and local guidance support it. Established or phosphorus-rich soil may not need added phosphorus, and some jurisdictions restrict it. Apply any product at the label rate and keep it off hard surfaces and waterways.

Grass type	New lawn rate	Expected germination
Kentucky bluegrass	2-3 lb per 1,000 sq ft	14-21 days
Tall fescue	6-8 lb per 1,000 sq ft	7-12 days
Perennial ryegrass	4-5 lb per 1,000 sq ft	5-10 days
Fine fescue	4-5 lb per 1,000 sq ft	7-14 days
Zoysia	1-2 lb per 1,000 sq ft	14-21 days

Grass Seed Calculator

Lawn area, grass type, and seeding

Grass Seed Rate Reference

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