Cost to overseed a quarter-acre lawn
A quarter acre is 10,890 square feet of grass. The bill is mostly seed — and the bag label decides how much of the bag is live seed, not the headline price per pound.
How many pounds of seed
Penn State Extension publishes overseeding rates per 1,000 sq ft. Multiply by 10.89 (thousands in a quarter acre) to get the pounds specified before PLS adjustment:
| Grass | Rate (lb / 1,000 sq ft) | ¼ acre (lb specified) |
|---|---|---|
| Kentucky bluegrass | 1.5–2 | 16.3–21.8 |
| Tall fescue | 6–8 | 65.3–87.1 |
| Mix with perennial ryegrass or fine fescue | 3–5 | 32.7–54.5 |
Tall fescue has no published reduced overseeding rate, so the establishment figure is used rather than inventing half. For any other lawn size, use the grass seed calculator. Timing is a different question — overseeding guide and today's soil reading.
Your bag label and local price
Read purity and germination off the seed tag. Penn State's formula: PLS = purity × germination ÷ 100; pounds to buy = pounds specified ÷ (PLS ÷ 100).
Penn State's seedlot comparison
The dollar amounts below come from Penn State Extension's Lawn Establishment publication — worked examples, not a quote from your store today. They show why a cheap bag can cost more per pound of live seed:
| Example | Purity | Germ | PLS | Multiplier | Price/lb | Cost/lb PLS |
|---|---|---|---|---|---|---|
| Seedlot A | 85% | 60% | 51% | 2.0× | $0.95 | $1.86 |
| Seedlot B | 99% | 90% | 89% | 1.1× | $1.50 | $1.68 |
Seedlot A looked cheaper at $0.95/lb but cost $1.90 per pound of PLS; Seedlot B at $1.50/lb worked out to $1.65 per pound of PLS. Run the same comparison on whatever bag you are holding.
What this page does not add
Core aerator rental, starter fertilizer, and hose-end sprinklers vary by store and region — we do not have an extension-published total for those line items on a quarter-acre overseeding job. If you aerate, rent for the day you can keep the machine moving; seed has to reach soil, which is the point of the overseeding guide's contact section.
Questions people actually ask
How big is a quarter-acre lawn?
One quarter acre is 10,890 square feet (43,560 sq ft per acre ÷ 4). That is a common suburban lot after subtracting the house, driveway and beds — measure your grass area; do not assume the lot size on the deed is all lawn.
How much does it cost to overseed a quarter-acre lawn?
Most of the DIY bill is seed. At Penn State's overseeding rates, a quarter acre needs roughly 16–22 lb of specified Kentucky bluegrass seed, or 65–87 lb for tall fescue — before adjusting for pure live seed on the bag label. Penn State's Lawn Establishment publication walks through label math with example seedlots at $0.95 and $1.50 per pound; plug your local bag price into the calculator below for your number.
What is pure live seed (PLS)?
PLS is the fraction of the bag that can actually germinate: purity (percent pure seed on the label) × germination ÷ 100. Penn State Extension says to divide 100 by that PLS percentage to find how many pounds of that bag you need for each pound the seeding rate calls for.
Is hiring a pro cheaper than DIY?
We do not publish a pro price range — those SERPs are dominated by lead-gen marketplaces with proprietary job data, which is exactly the head term this site avoids. What you can compare yourself is material (seed, optional aerator rental) against a quote that lists the same scope: mow, aerate or slice-seed, seed, and water until establishment.
Sources
- Penn State Extension — Lawn Establishment: seeding rates, seed label figure, PLS formula, Seedlot A/B cost examples ($0.95 and $1.50/lb).
- Penn State Extension — Kentucky Bluegrass: 1.5–2 lb per 1,000 sq ft overseeding; 3–5 lb for mixtures with ryegrass or fine fescue.
- Penn State Extension — Calculating the Price of Pure Live Seed: PLS arithmetic and comparing seedlots by cost per pound of live seed.