Grass Seed Table
| Grass | Season | Best spot | Drought |
|---|---|---|---|
| Kentucky bluegrass | cool | full sun, north | low - shallow roots |
| Tall fescue | cool | sun to part shade, transition zone | high - deep roots |
| Fine fescue | cool | shade champion, low input | moderate |
| Perennial ryegrass | cool | full sun, fast cover, wear | moderate-low |
| Bermudagrass | warm | full sun, south | high |
| Zoysiagrass | warm | sun to light shade, south | high once established |
| Buffalograss | warm | full sun, plains native, low input | very high |
| St. Augustine | warm | shade-tolerant, Gulf south | moderate |
| Grass | Seed rate (lbs / 1,000 sq ft) | Germination |
|---|---|---|
| Kentucky bluegrass | 2-3 | 14-30 days |
| Tall fescue | 6-8 | 7-12 days |
| Fine fescue | 4-5 | 7-14 days |
| Perennial ryegrass | 5-9 | 5-10 days |
| Bermudagrass | 1-2 (hulled) | 7-14 days |
| Zoysiagrass | 1-2 | 14-21+ days |
| Buffalograss | 2-3 | 14-30 days |
| St. Augustine | not practical from seed | plugs or sod |
| Type | Best window | Fallback |
|---|---|---|
| Cool-season | mid-Aug to early Oct, soil 50-65°F falling | early spring at soil 50°F |
| Warm-season | May-June, soil 65-70°F rising | early summer, done by mid-June |
Buying grass seed is two decisions stacked: pick the species that matches your climate band and your yard's light, then weigh the right amount of it. The table below does both - eight common lawn grasses with their season type, the spot each one is actually happy in, drought tolerance, the extension-recommended seeding rate in pounds per thousand square feet, and how many days you will spend watering before the first green shows. Cool-season grasses (bluegrass, fescues, ryegrass) own the northern half of the country; warm-season grasses (bermuda, zoysia, buffalo, St. Augustine) own the South, and the transition zone in between can go either way, which is why tall fescue sells so well there.
Bottom line: rate times area, and patience by species. A 5,000 square foot tall fescue lawn at 6 to 8 pounds per thousand takes 30 to 40 pounds of seed; the same lawn in Kentucky bluegrass needs only 10 to 15 pounds because bluegrass tillers and fills gaps on its own. Germination runs on its own clock - perennial ryegrass cracks in under a week, fescues in one to two weeks, and Kentucky bluegrass can take a full month, which is why blends look patchy in week two and even by week six.
The honest part: these are extension-service band numbers, not recipe constants - cultivar, region and whether the seed bed was firmed all move them. St. Augustine appears in the table for completeness but is almost never planted from seed (viable seed is scarce); it goes down as plugs or sod. And the calendar matters as much as the rate: in early October the cool-season fall window is closing or closed in the northern states, and every warm-season grass is a full seven months from its planting month.
How to use
- Pick your species in the table: match the season type to your region first - that decision is not optional - then narrow by the light your yard actually gets, not the light you wish it got.
- Weigh it: rate from the second table times your square footage in thousands. The grass seed calculator does the arithmetic and the bag-count if you would rather not.
- Water to the slowest clock in your mix, not the fastest: the seed bed's top half-inch stays moist for the entire germination window, which for a bluegrass blend means three to four weeks of light daily water, tapering once the stand is up.
Frequently asked questions
How much grass seed do I need per 1,000 square feet?
It is a fourfold range by species, which is why the table exists: Kentucky bluegrass 2 to 3 pounds, fine fescue 4 to 5, tall fescue 6 to 8, perennial ryegrass 5 to 9. Warm-season seeding is lighter - bermuda 1 to 2 pounds hulled, zoysia 1 to 2, buffalo 2 to 3. Measure your lawn once with the lawn size calculator, then multiply by the thousand-square-foot rate; when in doubt within a band, the higher end covers a rough seed bed.
When is the right time to plant grass seed?
Cool-season grasses want late summer into early fall - roughly mid-August through early October in the north, while soil is still warm but the air has cooled - so seedlings establish without summer heat. The fallback is early spring the moment soil reaches 50 degrees. Warm-season grasses go down in late spring, once soil holds 65 to 70 degrees and rising, typically May into June. Seeding a warm-season lawn in autumn is the one genuinely wrong answer in this table.
Why is my grass seed not germinating?
Work down the clock first: Kentucky bluegrass legitimately takes 14 to 30 days, and mixes look broken in week two when they are fine. Then the usual culprits - the top half-inch of soil dried out even once, seed buried deeper than a quarter inch, soil under 50 degrees for cool-season types, seed older than a season or two, or straw so thick it shades the row. Pre-emergent weed herbicide applied this season will also stop seed cold.
What is the best grass seed for shade?
Fine fescue - creeping red, chewings, hard - is the shade champion among cool-season grasses and also needs the least water and fertilizer. Tall fescue manages part shade and is the tougher family for feet and dogs. In the warm-season group, St. Augustine tolerates shade best but ships as plugs or sod, not seed. Below about four hours of sun, no grass thrives; mulch or a groundcover beats a thin lawn that will never fill in.
Should I buy a blend or a single species?
A blend spreads risk - one component covers shade, another disease, another traffic - and evens out the germination-stagger between species. Classic cool-season mixes pair Kentucky bluegrass for self-repair with ryegrass for speed and fine fescue for shade; tall fescue often performs best near-pure in the transition zone. Single-species stands look more uniform when they work and fail more completely when they do not.
Is overseeding the same rate as new seeding?
Overseeding runs roughly half the new-lawn rate - the survivors already own the ground, you are thickening, not starting. Early fall overseeding after core aeration is the standard move for cool-season lawns because the holes catch seed and the season does the watering. Two cautions: crabgrass pre-emergent in spring and any broadleaf weed control within a few weeks of seeding will undo the work, and a thatch layer over half an inch should be dethatched first or the seed never reaches soil.