Best Fast Growing Grass Seed for a Bare Backyard

The best gas fast growing grass seed for most yards is the Scotts Turf Builder Rapid Grass Tall Fescue Mix, because one 5.6 lb bag seeds 615 sq. ft. of brand-new lawn and carries fertilizer in the same bag. If you're patching dinner-plate bare spots rather than reseeding a whole yard, Scotts EZ Seed Patch & Repair is the smarter buy at 85 sq. ft. per 3.75 lb jug. The specification that splits this field isn't germination speed at all. It's coverage per bag, and the six picks here range from 85 sq. ft. to 4,000 sq. ft.

Best gas fast growing grass seed at a glance

Which buyer is each of these six picks for?

I built this shortlist around buyer profiles rather than a single scorecard, because coverage figures in this category span a fiftyfold range. A product that wins for one job is absurd for another.

Here are the four profiles the six picks map to:

1. The whole-yard reseeder. You have a large thin lawn and want visible green in weeks. You need seed, fertilizer and enough of both to cover hundreds of square feet. Scotts Rapid Grass and Pennington Contractors Central sit here.
2. The spot patcher. Three or four bald areas, maybe a dog run or a spot under a downspout. Scotts EZ Seed is built for exactly this and nothing larger.
3. The budget spreader. You have ground to cover and no interest in paying for mulch and fertilizer you can buy separately. Pennington Kentucky 31 is the cheapest of the six and claims coverage up to 4,000 sq. ft.
4. The deadline case. A property showing, a rental inspection, a party. Both Jonathan Green Fast Grow bags target this, and the listing is unusually honest that the result is temporary.

Two picks were straightforward to place. The 3 lb Jonathan Green 40820 publishes only three feature bullets and no warranty, which puts it behind its 7 lb sibling on transparency. And the modifier in the query is worth a note: nothing here is sold as a fuel or gas-related product, so treat "gas" as a search artefact rather than a specification you can shop for. What you can shop for is establishment speed and coverage, and those are published.

Coverage per bag: the number that actually decides it

Most fast growing grass seed comparisons lead with germination window. Every cool-season mix here wants daytime temperatures between 60°F and 80°F, so that number tells you when to seed, not what to buy. Coverage per bag is the figure that changes the outcome.

Look at the spread:

• Scotts EZ Seed, 3.75 lb: up to 85 sq. ft.
• Scotts Rapid Grass, 5.6 lb: 615 sq. ft. new lawn, 1,845 sq. ft. overseeding
• Jonathan Green 40820, 3 lb: 1,500 sq. ft. claim
• Jonathan Green Fast Grow, 7 lb: 1,750 sq. ft. new lawn, 3,500 sq. ft. overseeding
• Pennington Kentucky 31, 3 lb: up to 4,000 sq. ft. claim
• Pennington Contractors Central, 7 lb: up to 4,000 sq. ft. claim

That range isn't a quality ranking. It's a difference in what's in the bag. EZ Seed is mostly mulch and fertilizer by volume, with seed distributed through it, so a jug covers a patio-sized area. Pennington Kentucky 31 is straight seed, so 3 lb spreads far.

The practical step is simple. Measure the area you're seeding before you shop. A 20 by 30 ft strip is 600 sq. ft., which one bag of Scotts Rapid Grass handles at the new lawn rate. Four scattered bare spots the size of a bath mat total under 20 sq. ft., and a single EZ Seed jug is overkill already.

Note the two rates on the same bag, too. Overseeding coverage runs roughly three times the new lawn figure on both Scotts Rapid Grass and Jonathan Green Fast Grow, because you're thickening existing turf instead of building from bare soil. Buying to the overseeding number when your soil is bare is how people end up with thin, patchy results and blame the seed.

1. Scotts Turf Builder Rapid Grass Tall Fescue Mix — Best overall

The best gas fast growing grass seed for a full yard job, because it pairs the widest published coverage-per-pound of the seed-plus-fertilizer picks with a clear new lawn rate.

Best for: reseeding a large thin lawn in one weekend Skip it if: you only have a few dinner-plate bare spots

This is the one pick in the set that publishes both rates without ambiguity: 615 sq. ft. for a new lawn, 1,845 sq. ft. for overseeding, from a 5.6 lb bag measuring 15 x 4.5 x 9.5 in. Scotts describes it as grass seed and fertilizer in one, and says it grows grass 2X faster than seed alone when applied at the new lawn rate with proper care. That's the manufacturer's claim, and the qualifier at the end of it is doing real work.

The mix is tall fescue, which matters more than the speed line. Tall fescue is a bunch-type cool-season grass with deep roots, so a stand established from this bag is meant to persist rather than die back after one season. Two of the other picks here lean on annual ryegrass instead, which is a different bargain entirely.

Scotts also names the intended job plainly: overseeding large problem areas and establishing new grass, in spring or fall between 60°F and 80°F. It's the most expensive pick here, and it carries a listed warranty. Against the cheaper straight-seed bags, you're paying for the fertilizer in the same bag and a much smaller footprint of ground covered.

Pros:

• Both new lawn and overseeding rates published
• Tall fescue mix built to persist, not just green up
• Fertilizer included, no separate starter needed
• Warranty listed on the product page
• Clear 60°F to 80°F application window

Cons:

• Most expensive of the six picks
• 615 sq. ft. new lawn coverage trails the straight-seed bags badly
• The 2X faster figure is a manufacturer claim with care caveats
• Only two sellers list it

2. Pennington Kentucky 31 Tall Fescue Grass Seed — Best budget pick

The cheapest of the six and the coverage champion per pound, claiming up to 4,000 sq. ft. from a 3 lb bag.

Best for: covering the most ground for the least money Skip it if: you want mulch and starter fertilizer included

Kentucky 31 is a specific tall fescue variety, not a proprietary blend, and that's the whole reason this bag is the cheapest here while claiming the widest reach. Pennington lists coverage up to 4,000 sq. ft. from 3 lb, in a compact 11 x 3 x 7.5 in bag. The listing describes it as sun and shade seed for full sun to medium-shaded areas, and calls it drought-resistant in the title.

What you don't get is any of the carrier material the Scotts products build their case on. No mulch, no controlled-release fertilizer, no tackifier. On bare or sloped soil you'll want to add your own starter fertilizer and something to hold the seed in place, which eats into the saving.

It also publishes the most substantial warranty language of any pick here: a stated money-back offer with a mailing address, phone number and a note to keep your bag and proof of purchase. That's unusual detail in this category. Against the Scotts picks, the trade-off is straightforward. You're doing the soil prep and feeding yourself in exchange for covering many times more ground for less.

Pros:

• Cheapest of the six picks
• Claims up to 4,000 sq. ft. from just 3 lb
• Detailed money-back warranty terms published
• Rated for full sun through medium shade
• Sells briskly compared with most of this set

Cons:

• No mulch, fertilizer or tackifier in the bag
• Only two feature bullets published, so little detail to judge
• Bare or sloped soil needs extra products you buy separately
• Single variety rather than a blended mix

3. Scotts EZ Seed Patch & Repair for Sun and Shade — Best upgrade

The most complete product in the set per square foot, and the only one that packages mulch, fertilizer and a tackifier around the seed.

Best for: small bare patches, slopes and high-traffic gaps Skip it if: you need to cover more than a hundred square feet

EZ Seed solves a different problem than everything else here. The 3.75 lb jug covers up to 85 sq. ft., which sounds poor until you read what's inside: a seed mix of Kentucky bluegrass, perennial ryegrass and fine fescue, plus mulch that expands around the seed, controlled-release fertilizer and a tackifier that Scotts says helps stop seed washing away.

That last ingredient is why this is the pick for slopes and downspout washouts. On a grade, loose seed migrates downhill with the first watering. Scotts lists the product as suitable for full sun, dense shade, high-traffic areas and slopes, with a three-step process: prep the area, apply evenly, water until no more is absorbed.

It's the second-cheapest of the six and by some distance the one buyers here reach for most often. Germination wants 60°F to 80°F daytime temperatures with no frost risk, same as the rest. The obvious limit is scale. At 85 sq. ft. per jug, patching a 600 sq. ft. area would take seven of them, which is where Scotts Rapid Grass becomes the sane choice instead.

Pros:

• Mulch, fertilizer and tackifier included with the seed
• Three-species blend spanning full sun to dense shade
• Tackifier suits slopes and washout-prone spots
• Second-cheapest pick in this set
• The clear favourite among these six with buyers

Cons:

• Only 85 sq. ft. per jug, easily the least here
• No published warranty
• Wildly uneconomical for whole-lawn work
• Listed weight of 8 oz conflicts with the 3.75 lb size

4. Pennington Contractors Central Grass Seed Mix — Best for pros

A 7 lb all-purpose bag claiming up to 4,000 sq. ft., blended for the central region rather than sold as one national formula.

Best for: central-region lawns needing broad, dense coverage Skip it if: you live outside the central region this mix targets

The regional angle is the interesting part. Pennington says this mix is formulated and blended specifically for the region of the country where it's sold, which is a different design philosophy from a single blend shipped everywhere. For a central-region lawn, that's a genuine advantage over a generic bag. If you're outside that region, it's a reason to look elsewhere.

The bag is 7 lb in a 16.5 x 3.55 x 7.5 in package, mid-range in price for this set, and Pennington claims coverage up to 4,000 sq. ft. The listing positions it for new lawns, overseeding and lawn repair alike, and describes the growth as quick, dense and professional-grade. That's marketing language, and there's no published germination window or species breakdown to check it against.

Which is the real weakness. Pennington Kentucky 31 tells you exactly which variety you're sowing. This bag doesn't name its species at all, so you're buying the brand's regional judgment sight unseen. It sells at a decent clip here, and it's the largest bag with the widest claimed coverage in the set, which is why contractors and anyone seeding a big area should shortlist it.

Pros:

• Blended for the region where it's sold
• Claims up to 4,000 sq. ft. from one bag
• Covers new lawns, overseeding and repair
• Mid-range price for the biggest coverage claim here

Cons:

• No species or variety breakdown published
• No germination temperature range listed
• No stated warranty, unlike both Kentucky 31 and Rapid Grass
• Regional formulation is a drawback outside that region

5. Jonathan Green Fast Grow Grass Seed — Best minimal setup

The most honest listing in the set, because it tells you outright the lawn it grows lasts one season.

Best for: getting green cover down fast before a deadline Skip it if: you want the result to last past this season

Jonathan Green calls this a temporary grass seed that lasts throughout one season, and recommends overseeding the result with a Black Beauty mix for a lawn that persists. Nobody else in this set volunteers that. It's the reason to buy it, and the reason to skip it.

The mix contains annual ryegrasses, tall fescues and fine fescues, and grows in full sun to medium shade. Annual ryegrass germinates and covers quickly, then dies out. The 7 lb bag seeds up to 1,750 sq. ft. for new lawns or 3,500 sq. ft. for overseeding, in a flat 2.5 x 15 x 12 in package. Best application window is mid-August to mid-October or mid-March through mid-May, and the listing promises dense turf with a dark green colour.

Think of it as ground cover with a deadline. Bare soil before a house showing, an eroding slope you need stabilised this month, a construction scar you'll properly reseed next spring. It's a premium price for a one-season result, and it's the slowest-moving of the six here. That's a fair reflection of how narrow the use case is.

Pros:

• Both coverage rates published: 1,750 and 3,500 sq. ft.
• Listing states plainly that results are temporary
• Three-species mix for sun through medium shade
• Warranty listed
• Specific application windows given by month

Cons:

• Lasts one season, then needs full overseeding
• Premium price for a temporary outcome
• Slowest seller of the six
• Annual ryegrass content means recurring cost

6. Jonathan Green 40820 Fast Grow Grass Seed — Runner-up

The small-bag version of the Fast Grow idea, covering 1,500 sq. ft. from 3 lb, with far less published detail behind it.

Best for: a single mid-sized problem area, roughly 1,500 sq. ft. Skip it if: you want published details before you buy

This bag makes sense when your problem area is one patch of a few hundred square feet and you don't want a 7 lb bag going stale in the garage. Coverage is listed at 1,500 sq. ft. from 3 lb, in a 3 x 14 x 9 in package, and the listing confirms it contains annual ryegrass.

That's essentially all it tells you. Three feature bullets total, one of which is the coverage figure and another of which is the phrase "100% superior grass seed". There's no germination temperature range, no full species list, no application calendar and no stated warranty. Compare that with the 7 lb Fast Grow bag, which names its three grass types, gives you month-by-month timing and publishes warranty coverage.

The annual ryegrass content is the tell. Expect the same fast-cover, one-season behaviour as its bigger sibling, and plan to overseed. It's mid-priced, only one seller lists it, and it moves slowest of anything in this comparison. Buy it for the size, not for the information behind it.

Pros:

• 1,500 sq. ft. coverage from a compact 3 lb bag
• Right size for one mid-sized problem area
• Contains annual ryegrass for quick cover
• Mid-range price, not the priciest here

Cons:

• Only three feature bullets published
• No germination window or full species list
• No stated warranty
• Just one seller lists it

Seed only, or seed plus mulch and fertilizer?

This is the fork in the road for anyone shopping fast growing grass seed, and it's where most of the price difference lives.

All-in-one bags put seed, mulch, fertilizer and sometimes a tackifier in the same container. Scotts EZ Seed is the fullest example here, listing all four components. Scotts Rapid Grass includes seed and fertilizer. You pay per square foot and you pay a lot, but everything the seed needs is already mixed.

Straight seed bags are just seed. Pennington Kentucky 31 and Pennington Contractors Central both fall here, and both claim up to 4,000 sq. ft. Cheaper per square foot by a wide margin, and you supply the rest.

Which one to pick:

• Bare soil on a slope favours all-in-one, specifically because of the tackifier. Loose seed on a grade washes to the bottom.
• Thinning turf across a large lawn favours straight seed. Existing grass already holds the new seed in place, and the overseeding rate stretches a bag much further.
• Small isolated spots favour all-in-one on convenience alone. Buying a bag of seed, a bag of starter fertilizer and topsoil for 20 sq. ft. is silly.
• Big new lawn on a budget favours straight seed plus a separate starter fertilizer, which almost always costs less than the equivalent all-in-one coverage.

Does "fast" mean permanent?

No, and this is where the best gas fast growing grass seed shopping gets counterintuitive. Speed and longevity pull in opposite directions in this category, and the mix on the label tells you which side a product picked.

Annual ryegrass germinates quickly and dies within a season by design. Both Jonathan Green Fast Grow bags contain it, and the 7 lb listing states outright that the lawn should be overseeded with a Black Beauty mix afterwards.

Tall fescue takes longer to establish but persists. Scotts Rapid Grass is a tall fescue mix, and Pennington Kentucky 31 is a single tall fescue variety. Neither is described as temporary anywhere in its listing.

Kentucky bluegrass and fine fescue are the perennial components in the Scotts EZ Seed blend, alongside perennial ryegrass.

So the honest way to read a "fast" label is as a question about the ryegrass fraction. A high proportion means green in days and a bare patch again next year. A tall-fescue-led mix means a slower start and grass that stays. If you're seeding for a one-off deadline, take the speed. If this is your lawn for the next five years, take the fescue and accept a couple more weeks of dirt.

What the listings do not tell you

Even the most detailed of these six listings leaves gaps a first-time seeder will trip over.

• Seed percentages are absent. Jonathan Green names three grass types in its 7 lb mix but not the ratio. That ratio decides whether you get a temporary stand or a lasting one.
• Purity and germination percentages aren't published here. Bags carry a seed label in the store; the product pages don't reproduce it.
• Coverage claims assume a spreader and even application. Hand-broadcasting typically wastes seed and clumps it.
• Watering demand is understated. EZ Seed tells you to water until no more is absorbed, which on a warm week means daily attention until germination. None of the listings put a number of days on that.
• Regional suitability is mostly implicit. Only Pennington Contractors Central names a region. The rest are cool-season mixes by species, which you have to infer.
• Two picks publish no warranty at all. EZ Seed and Contractors Central list none, while Kentucky 31 spells out full money-back terms.

None of that disqualifies anything here. It just means measuring your area and reading the species list beats trusting the headline speed claim.

The verdict

If you're reseeding a whole yard and want it to last, Scotts Turf Builder Rapid Grass Tall Fescue Mix is the pick. It publishes both application rates, 615 sq. ft. for new lawn and 1,845 sq. ft. for overseeding, includes fertilizer, lists a warranty, and it's a tall fescue mix rather than a ryegrass sprint. That combination of transparency and persistence is why it takes the top spot.

If you're patching rather than reseeding, Scotts EZ Seed Patch & Repair wins instead, and it isn't close. The tackifier and expanding mulch are built for bare spots and slopes where loose seed washes away, and it's the second-cheapest pick here.

The cutoff is roughly 100 square feet of bare ground. Below that, EZ Seed's 85 sq. ft. jug is the efficient answer. Above it, the per-square-foot cost stops making sense and you want a seed bag.

Two conditions flip either call. If you're spreading over more than a few thousand square feet, Pennington Kentucky 31 claims up to 4,000 sq. ft. from 3 lb at the lowest price here, and it's worth buying starter fertilizer separately. And if you only need green cover for one season, Jonathan Green Fast Grow says so on the label and does exactly that.

FAQ

Is fast growing grass seed worth the extra cost?

Fast growing grass seed is worth the premium when the deadline is real: a house showing, an eroding slope, a lawn you need presentable this month. The all-in-one bags cost far more per square foot because you're buying mulch and fertilizer in the same container. For a large lawn with no deadline, straight seed plus a separate starter fertilizer covers much more ground.

How much area does one bag actually cover?

One bag covers anywhere from 85 sq. ft. to 4,000 sq. ft. across these six picks. Scotts EZ Seed lists up to 85 sq. ft. per 3.75 lb jug. Scotts Rapid Grass covers 615 sq. ft. as new lawn. Jonathan Green's 7 lb bag does 1,750 sq. ft. Both Pennington bags claim up to 4,000 sq. ft. Measure before you buy.

What temperature does the best gas fast growing grass seed need?

The temperature these cool-season mixes need is 60°F to 80°F daytime, with no frost risk. Scotts states that range for both Rapid Grass and EZ Seed. Jonathan Green gives calendar windows instead: mid-August to mid-October, or mid-March through mid-May. Seeding outside those windows is the single most common reason a bag underperforms, whatever the speed claim on the front.

Scotts Rapid Grass or Pennington Kentucky 31: which should I buy?

Scotts Rapid Grass or Pennington Kentucky 31 comes down to whether you want fertilizer included. Rapid Grass bundles seed and fertilizer and publishes 615 sq. ft. of new lawn coverage, but it's the most expensive here. Kentucky 31 is the cheapest and claims up to 4,000 sq. ft. from 3 lb, with no fertilizer or mulch. Big area, tight budget: Kentucky 31.

What mistake do first-time seeders make most?

The mistake first-time seeders make most is using the overseeding rate on bare soil. Overseeding coverage runs about three times the new lawn figure on the bags that publish both, because existing turf does half the work. Spread that thin on dirt and you get a patchy stand, then blame the seed. Second most common: letting seed dry out before germination.

Measure your bare area with a tape before you open a browser tab. That one number decides which of these six bags you want more than any germination claim on the front of the bag. Under 100 sq. ft., grab the EZ Seed jug and be done. A few hundred to a couple of thousand, Scotts Rapid Grass gives you a tall fescue stand and the fertilizer in one purchase. Much larger, and Pennington's straight-seed bags plus your own starter fertilizer will cover it for far less. Speed is the easy part; getting the rate right is what makes it stick.

Last updated: September 17, 2026. Product availability re-checked.

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