Question 1

How much grass seed do I need per square foot?

Accepted Answer

It depends on the grass type. Tall fescue and ryegrass need about 7 lbs per 1,000 sq ft for a new lawn. Kentucky bluegrass needs only 2 lbs per 1,000 sq ft. Overseeding rates are roughly half the new-lawn rate — you're filling in thin spots, not starting from scratch. The calculator adjusts for both the grass type and whether you're seeding new or overseeding.

Question 2

What is the difference between new seeding and overseeding rates?

Accepted Answer

A new lawn needs full coverage — seed is distributed across bare or tilled soil with no existing grass competing for it. Overseeding fills in an existing lawn that has thin or bare patches. Because some grass is already established, you use roughly half the seed rate. Using too much seed when overseeding wastes money and causes crowding that stresses seedlings.

Question 3

When is the best time to seed a lawn?

Accepted Answer

Cool-season grasses (fescue, bluegrass, ryegrass) establish best when seeded in late summer to early fall — soil is still warm, air is cooling, and fall rains reduce irrigation needs. Spring seeding works but competes with weed germination. Warm-season grasses (bermuda, zoysia) go down in late spring to early summer when soil temps are consistently above 65°F.

Question 4

How do I measure my lawn area accurately?

Accepted Answer

Use the Add Another Zone feature to break your lawn into rectangular sections. Measure each section and add them together. For irregular shapes, break the area into rough rectangles and sum them. For very irregular shapes, walk the perimeter with a measuring wheel or use a satellite measurement tool, then subtract hardscaped areas (beds, driveway, patio). Most homeowners slightly underestimate — when in doubt, add 10% to your total.

Question 5

What grass seed is best for shady areas?

Accepted Answer

Fine fescues (creeping red, chewings, hard fescue) are the most shade-tolerant cool-season grasses — they can handle as little as 4 hours of filtered sun. Tall fescue tolerates light shade. Kentucky bluegrass needs full sun and performs poorly in shade. Sun & shade mixes typically blend fine fescue with bluegrass or ryegrass to cover both conditions in one bag.

Question 6

Do I need to till the soil before seeding?

Accepted Answer

For a new lawn, yes — loosen the top 4 to 6 inches, remove rocks and debris, grade for drainage, and rake smooth before seeding. For overseeding, skip the full till: core-aerate or dethatch to open the surface, then seed directly into the existing lawn. Seed that lands on compacted soil without good soil contact rarely germinates well.

Question 7

How long does grass seed take to germinate?

Accepted Answer

Perennial ryegrass is the fastest — 5 to 10 days. Tall fescue and fine fescue take 7 to 14 days. Kentucky bluegrass is the slowest at 14 to 28 days. Bermuda can take 10 to 30 days depending on soil temperature. All of these assume consistent moisture — the seed coat must stay moist from germination through the first mowing.

Question 8

How often should I water after seeding?

Accepted Answer

Water lightly 2 to 3 times per day to keep the top 1 inch of soil consistently moist — never let it dry out until grass reaches 2 inches tall. After that, water deeply and less often (every 2 to 3 days) to encourage deep root growth. The most common mistake is watering too infrequently in the first two weeks, which kills germinating seedlings mid-sprout.

Grass Type	New Lawn	Overseeding	Season
Tall Fescue	7 lbs / 1K sq ft	3.5 lbs / 1K sq ft	Cool-season
Fine Fescue	4 lbs / 1K sq ft	2 lbs / 1K sq ft	Cool-season
Kentucky Bluegrass	2 lbs / 1K sq ft	1 lb / 1K sq ft	Cool-season
Perennial Ryegrass	7 lbs / 1K sq ft	3.5 lbs / 1K sq ft	Cool-season
Bermuda (hulled)	1.5 lbs / 1K sq ft	0.75 lbs / 1K sq ft	Warm-season
Sun & Shade Mix	7 lbs / 1K sq ft	3.5 lbs / 1K sq ft	Cool-season

Grass Seed Calculator

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