Best Grass Seed for Overseeding (2026): 6 Picks by Lawn Type

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The best grass seed for overseeding most lawns is Scotts Turf Builder Sun and Shade Mix, three fine fescues plus Kentucky bluegrass and perennial ryegrass, which Scotts lists at 2,240 sq ft of overseeding per 5.6 lb bag, and the mix Bob Vila names best for overseeding a cool-climate lawn. If your lawn is thin, Scotts Thick'R Lawn 3-in-1 Sun and Shade is Scotts' 3-in-1 solution for thin lawns that spreads seed, fertilizer and a soil improver in one pass, and Bob Vila named it the best overall of the eight seeds in its month-long grass seed test.

The other four picks match the grass you already grow: Scotts' Tall Fescue Mix for tall fescue lawns, its High Traffic Mix for yards that kids and dogs wear thin, and two Pennington ryegrasses, annual and perennial, for keeping a dormant bermuda lawn green through winter. Timing matters as much as the bag, and fall grass seed goes down on a deadline. The extension services put the best window for cool-season lawns in late summer and early fall, offer dormant seeding in November in Minnesota and Michigan and from mid-December in Nebraska, and put ryegrass over bermuda in October in South Carolina and late October through November in San Antonio; the table by region below has the dates. Reading this in November? In Minnesota and Michigan it is dormant-seeding season, and on a bermuda lawn around San Antonio ryegrass can still go down (see dormant seeding). For a lawn that is mostly shade, our best grass seed for shade guide goes deeper.

Jump to: When to overseed | How much seed | Match your lawn | Dormant seeding | Seed labels | Step by step | Ryegrass over bermuda

Start here: which overseeding seed for your lawn

• A cool-season lawn with sun and some shade: Scotts Turf Builder Sun and Shade Mix (pick 1).
• A tall fescue lawn: Scotts Turf Builder Tall Fescue Mix (pick 3).
• A thin lawn, in spring or early fall: Scotts Thick'R Lawn 3-in-1 Sun and Shade (pick 2), the overall winner of Bob Vila's month-long seed test.
• Kids, dogs or a worn path: Scotts Turf Builder High Traffic Mix (pick 4).
• Winter color on a bermuda lawn: Pennington Annual Ryegrass (pick 5).
• A finer winter lawn over bermuda: Pennington Smart Seed Perennial Ryegrass (pick 6).
• A bermuda lawn you will let go brown this winter: no fall seed; NC State seeds bermudagrass from April to July.
• Mostly shade: see our shade seed picks, sorted by how many hours of sun the spot gets.

The best grass seed for overseeding, by lawn

1. Scotts Turf Builder Sun and Shade Mix: best overall

Scotts' Sun and Shade Mix combines three fine fescues (creeping red, Chewings and hard fescue) with Kentucky bluegrass and perennial ryegrass, plus what Scotts calls Root-Building Nutrition: fertilizer and a soil improver in the same bag as the seed. The Amazon listing describes it for full sun and moderate shade, with medium drought resistance and medium to high durability. A 5.6 lb bag overseeds 2,240 sq ft, or seeds 745 sq ft of bare ground, so it goes about three times as far over an existing lawn. Scotts says to sow it in spring or fall once daily average soil temperatures hold between 55 and 70 degrees F, or air temperatures between 60 and 80 degrees F, to set a Scotts broadcast spreader to 5 for overseeding, and to water every day until the new grass reaches 2 inches. Its maker page says the mix spreads to fill thin spots over time and suggests overseeding once a year.

Why it is the pick: it fits the most common overseeding job, a northern lawn with a sunny side and a shady side. Iowa State's overseeding page says bluegrass is the top choice for sun while the fine-leaf fescues do best in shade, and for a partly shaded lawn it recommends a mixture of fine-leaf fescues, perennial ryegrass and bluegrass, which is this bag's recipe. Bob Vila's overseeding roundup names it the best seed for cool climates, its Northeast roundup names this exact 5.6 lb listing the best overall, and our shade guide picks it for lawns split between sun and shade. NC State explains why ryegrass and bluegrass are paired: the ryegrass establishes faster, and the bluegrass spreads by underground stems to fill in damaged areas.

Good to know: our shade guide sorts mixes by hours of sun. Because fertilizer and soil improver share the bag with the seed, compare its 2.5 lb per 1,000 sq ft with the other combination bags rather than with raw-seed rates (see the seed table).

2. Scotts Thick'R Lawn 3-in-1 Sun and Shade: best for a thin lawn

Thick'R Lawn is Scotts' 3-in-1 solution for thin lawns: grass seed to fill the gaps, fertilizer, and a soil improver for root development, spread together with a Scotts spreader. The seed in it is creeping red fescue with Kentucky bluegrass and perennial ryegrass, and one 40 lb bag covers 4,000 sq ft, which works out to 10 lb per 1,000 sq ft. Scotts says it can give you up to a 50 percent thicker lawn with proper care, with results depending on the lawn you start from, and it names fall and spring as the times to use it, with temperatures from 60 to 80 degrees F and no frost danger left. Mow to about 2 inches or your lowest setting, rake or dethatch, apply, then water daily for the first 2 weeks.

Why it is the pick: Bob Vila tested eight grass seeds for a month and made Thick'R its best overall, noting that it works in both sunny and shady areas. It gave Thick'R the hardest plot in the test, a completely bare patch beside a covered deck that sat "half in full sun and half in mostly shade." The seed took just over 2 weeks to get going, and by the end of the month that patch had gone from the worst section to one of the best; on thin parts of the tester's lawn it gave noticeably thicker, greener grass. The tester's summary is that what it "lacked in initial impressiveness it made up for in its ease of use and overall end result." Because the fertilizer rides in the same bag, it also saves the separate feeding pass that overseeding usually calls for.

Good to know: Scotts' directions call for two applications a year, once in spring and once in late summer or early fall. The label says to apply it only to actively growing turf, so it is a spring or early fall product rather than a dormant seed, and to hold off on weed control until the new grass has been mowed at least four times. The label also says to keep it away from water, storm drains and drainage ditches and to sweep any that lands on pavement back onto the lawn.

3. Scotts Turf Builder Tall Fescue Mix: best for tall fescue lawns

This is straight tall fescue seed with Scotts' fertilizer and soil improver, the 16 lb bag of the mix Bob Vila tested. It overseeds 4,000 sq ft, 4 lb per 1,000 sq ft, or seeds 1,330 sq ft of new lawn. Scotts describes it as a durable, low-maintenance grass that resists heat and drought, for sunny spots or moderate shade. Its planting window is spring or fall with air temperatures steadily in the 65 to 85 degree F range, and the seedbed should stay moist for 3 weeks or more, until the seedlings reach 2 inches.

Why it is the pick: overseed a tall fescue lawn with tall fescue. In North Carolina's mountains and piedmont, NC State calls tall fescue the best grass to plant for a lawn that stays green year-round, and it notes that tall fescue grows in bunches rather than spreading, so damaged or bare areas have to be reseeded. That makes a regular overseeding part of keeping one thick. Bob Vila's test made this mix its best low-maintenance seed and says it suits "most regions (other than the extreme north or deep south)."

Good to know: in Bob Vila's test it was among the last seeds to sprout and grew slowly until watering went up to three times a day; a few weeds came up in the meantime and the tester sowed a second round to fill in. Scotts' 65 to 85 degree window sits warmer than the Sun and Shade Mix's. NC State's window for tall fescue closes October 1 in the piedmont and October 15 in the coastal plain (see the timing table). NC State also suggests blending two or three cultivars rather than sowing just one.

4. Scotts Turf Builder High Traffic Mix: best for kids and dogs

High Traffic Mix is Kentucky bluegrass and perennial ryegrass with Scotts' fertilizer and soil improver. Scotts lists it for full sun and light shade, with low drought resistance and high durability, and says it "self-repairs to withstand wear and tear." A 5.6 lb bag overseeds 2,800 sq ft, 2 lb per 1,000 sq ft, or seeds 930 sq ft of new lawn. Scotts' page gives a spring or fall sowing window, with soil averaging 55 to 70 degrees F a day or air at 60 to 80 degrees F; keep the soil moist for 3 weeks or more, until the seedlings reach 2 inches. Scotts' High Traffic Mix page notes that the seed is treated with mefenoxam and is not for food, feed or oil use.

Why it is the pick: Bob Vila's test made it the best seed for high traffic. It germinated later than most of the field, which the tester put partly down to watering, since full-sun seed wanted water two to three times daily; once the sprinkler schedule was steady, it grew a durable strip of turf on the route the household and its dogs take up and down the deck.

Good to know: Scotts gives it low drought resistance, so plan to water it through dry spells, and its light range stops at light shade. Bob Vila's notes list frequent watering to germinate as the one thing to plan for. The 2,800 sq ft figure is for overseeding; a bare patch takes three times the seed per square foot.

5. Pennington Annual Ryegrass: best for winter color on a bermuda lawn

Annual ryegrass is a temporary grass: sown into a dormant bermuda lawn in fall, it keeps the yard green through winter and dies out as the weather warms. Pennington sells it to give southern lawns green grass through winter, for spots that get 6 to 8 hours of sun, and its planting chart gives germination as 3 to 7 days. Pennington lists two coverage figures: the planting chart's overseeding rate of 5 lb per 1,000 sq ft, or 2,000 sq ft for the 10 lb bag, and, in its product description, a pound to 100 sq ft for winter overseeding, which works out to 10 lb per 1,000 sq ft and 1,000 sq ft per bag. Pennington's directions are to mow the existing grass as short as possible, apply a starter fertilizer, spread the seed and keep it moist until the ryegrass is about 3 inches tall. It also sells it as temporary support for a thin northern lawn.

Why it is the pick: it is made for the winter overseed, and Pennington's two figures sit within the extension range: Clemson puts 5 lb of ryegrass per 1,000 sq ft into an established bermuda lawn, and the Texas A&M column goes to 10 to 12 lb for a dense stand. Texas A&M's Bexar County horticulture column calls annual ryegrass the fastest germinating type, and the variety it suggests for San Antonio homeowners is an annual (Pantera) because it dies out faster in spring and gets in the bermuda's way less. By Pennington's planting charts it also sprouts sooner than the perennial pick, in 3 to 7 days against 8 to 14.

Good to know: Clemson calls annual ryegrass "a second choice to perennial ryegrass for lawn quality": lighter in color, coarser, and quicker to die out in spring. NC State notes that some homeowners use it for winter color on bermudagrass and never recommends it for overseeding other warm-season grasses, and it warns that annual ryegrass is a weed in tall fescue that cannot be removed selectively; Pennington's own list also names zoysia and other warm-season grasses. Clemson adds that once you overseed a bermuda lawn you should plan to keep doing it, because ryegrass seed that did not sprout can come up in later years in weedy clumps.

6. Pennington Smart Seed Perennial Ryegrass: best for a finer winter lawn

Pennington's Smart Seed Perennial Ryegrass comes with fertilizer in the bag and is meant for spots with four to six hours of daily sun. Pennington pitches perennial ryegrass for both of the jobs it does well, a permanent part of a cool-season lawn and a temporary winter lawn over warm-season grass, with fine blades that keep their color into winter. Pennington gives germination as 8 to 14 days and an overseeding rate of 4 lb per 1,000 sq ft, so the 3 lb bag is enough for 750 sq ft.

Why it is the pick: Clemson ranks perennial ryegrass ahead of annual for lawn quality, citing better turf characteristics and better disease resistance, so it is the pick for a bermuda lawn you want looking its best all winter. Bob Vila's overseeding roundup names this Pennington bag its best perennial ryegrass and says it is known for fast germination and a dense, fine-textured lawn. In a permanent cool-season lawn it plays the quick-sprouting partner to Kentucky bluegrass, the role NC State gives perennial ryegrass in a permanent lawn.

Good to know: Clemson notes that perennial ryegrass tends to survive well into early summer, longer than annual, above all in shade, and can hang on for years in parts of a bermuda lawn. Bob Vila lists its drought tolerance as low. At its 750 sq ft per bag, a 5,000 sq ft bermuda lawn takes 7 bags. NC State never seeds perennial ryegrass alone for a permanent North Carolina lawn; it always mixes it with Kentucky bluegrass.

How we chose these

We compared 82 grass seed listings on Amazon, from Scotts, Pennington, Jonathan Green, GreenView, Outsidepride, Barenbrug and others, and read 39 of them in full: seed types, the makers' coverage figures, sellers and stock. For every pick we read the maker's product page and bag directions. We read the results of Bob Vila's month-long test of eight grass seeds, plus Bob Vila's research roundups for overseeding, the Northeast, tall fescue and Kentucky bluegrass. For timing, seeding rates and technique we went to the land-grant extension services: Minnesota, Michigan State, Iowa State, Nebraska, Kansas State, NC State, Clemson, Texas A&M and UConn.

Then we matched each seed to a lawn type instead of ranking bags in the abstract. Bob Vila's overseeding roundup says to match the seed to the grass already there; ryegrass is the exception, for winter color on a dormant warm-season lawn. Every pick was in stock on Amazon on November 1, 2026, and sold by Amazon. The seed table works out each pick's rate per 1,000 sq ft from the maker's own coverage figure.

Also considered: seed that missed the list and why

• Scotts Sunny Mix (Turf Builder): Bob Vila's test found it one of the quickest seeds to germinate. Amazon sells it in a 2.4 lb bag that overseeds 1,080 sq ft, and picks 1 and 4 cover the same bluegrass and ryegrass job in larger bags.
• Pennington Smart Seed Sun and Shade South: Bob Vila's overseeding pick for warm climates, a southern tall fescue mix; pick 3 covers tall fescue lawns.
• Pennington Smart Seed Northeast Mix: perennial ryegrass, Kentucky bluegrass and tall fescue in a 20 lb bag; no tester we read covered it, and pick 1 covers the northern mixed lawn.
• Scotts Turf Builder Perennial Ryegrass Mix: Bob Vila's Northeast pick for perennial ryegrass; pick 6 covers perennial ryegrass, and Pennington sells its bag for temporary warm-season lawns as well.
• Scotts Grass Seed Drought Tolerant Mix: Kentucky bluegrass and tall fescue, overseeding up to 5,000 sq ft per 10 lb bag; no tester we read covered it, and picks 1 and 3 cover those grasses.
• GreenView Pure Grass Seed Perennial Ryegrass Blend: a 20 lb bag that overseeds up to 10,000 sq ft; no tester we read covered it, and pick 6 covers perennial ryegrass.
• Scotts Professional Turfgrass Seed Tall Fescue Mix: uncoated bulk seed in a 50 lb bag at 4 lb per 1,000 sq ft for overseeding; the Amazon listing carries no model number to match against Scotts' product, which our pick floor requires.
• Pennington Kentucky 31 Tall Fescue: NC State says improved tall fescue cultivars are "more shade tolerant, denser, and finer textured than Kentucky 31, a commonly used older cultivar."
• Scotts Turf Builder Kentucky Bluegrass Mix: Bob Vila's overseeding pick for bluegrass; out of stock on Amazon on November 1.

When to overseed your lawn, by region

For cool-season lawns, every extension service we read puts the best window in late summer into early fall. Iowa State gives the reasons: seed germinates quickly in warm late-summer soil, fall's warm days and cool nights push the young grass along, and fewer weed seeds sprout then. For bermuda overseeded with ryegrass, the clock runs later, once the bermuda is slowing toward winter. Here are the dates, with each source's fallback.

Clemson's rule of thumb for the ryegrass date is about 30 days ahead of the first frost, with highs around 70 degrees F and lows typically over 50. For North Carolina tall fescue, NC State's best alternative to fall is mid-February to early March in the piedmont.

How much seed do you need to overseed?

The bag tells you, and for these six picks the makers' overseeding figures run from 2 lb to 10 lb per 1,000 sq ft. Those numbers do not compare directly. Picks 1 to 4 and 6 carry fertilizer in the weight (picks 1 to 4 a soil improver too), and UConn's seed-label guide warns that seed coatings can make up half of what is in a bag. So go by each bag's own overseeding figure. The table works it out for a 5,000 sq ft lawn, a little over a tenth of an acre.

To size your own lawn, multiply length by width for each rectangle of grass and add them up, then divide by the bag's overseeding coverage and round up. For raw seed, extension overseeding rates run about half of a new-lawn rate: Nebraska gives 1 to 2 lb of Kentucky bluegrass or 3 to 4 lb of tall fescue per 1,000 sq ft, and Kansas State gives the same tall fescue range and about 2 lb of bluegrass. Over dormant bermuda, Clemson uses 5 lb of ryegrass per 1,000 sq ft, Pennington's description of its annual ryegrass works out to 10 lb, and the Texas A&M column goes up to 10 to 12 lb of annual ryegrass for a dense stand. For a dormant seeding, Minnesota suggests buying 10 to 20 percent more seed than you need, to fill any spots that fail to come up in late spring.

Which grass seed matches your lawn?

Start with what is already growing. Michigan State suggests keeping a record of the mix you sow, so that later patches match and the lawn does not end up in different shades of green. Iowa State draws the line between interseeding, which adds more of the same grass to thicken a lawn, and true overseeding, which brings in a different species, sometimes a cool-season grass sown into dormant warm-season turf; both are done the same way.

• Kentucky bluegrass lawns: the usual sunny northern lawn. Iowa State suggests a mix with at least two or three bluegrass cultivars. Bluegrass is slow to sprout, 10 to 28 days by Nebraska's figure, which is why mixes pair it with perennial ryegrass (picks 1, 2 and 4).
• Tall fescue lawns: pick 3. NC State recommends a blend of two or three improved cultivars and a rate of 6 lb per 1,000 sq ft for a new seeding, warning that more is not better.
• Shady lawns: fine fescues lead in shade, by Iowa State's account; our grass seed for shade guide sorts mixes by hours of sun.
• Bermuda lawns: overseed with ryegrass for winter color (picks 5 and 6). Thickening the bermuda itself is a warm-weather job: NC State seeds bermudagrass from April to July.
• Other warm-season lawns: NC State notes that a few warm-season grasses have to go in as sod, sprigs or plugs, since their seed is unavailable or grows into an uneven stand, and it does not recommend annual ryegrass over any warm-season grass but bermuda.

Mixing in a new species can work on purpose. A University of Minnesota turf team article describes how its author overseeded a drought-thinned Kentucky bluegrass lawn with a blend of four turf-type tall fescues at 7 lb per 1,000 sq ft on August 20, so the lawn would combine bluegrass's winter hardiness with tall fescue's drought tolerance, and saw seedlings within ten days.

Can you overseed in November? Dormant seeding explained

Dormant seeding means sowing cool-season seed once the soil is too cold for it to sprout, so it sits through winter and comes up in spring. Minnesota does it once soil temperatures drop below 40 degrees F, usually early November through mid-March in most of the state, and its turf team puts the usual date at mid- to end-November, once daytime highs are down to 35 to 40 degrees. Michigan State puts dormant seeding in November; Nebraska Extension in Lancaster County prefers mid-December through mid-February and no later than March 15.

Why wait for the cold: Minnesota's turf team says seedlings that come up just before winter usually do not survive it unless they have matured, which makes an October seeding in Minnesota or Michigan a gamble. A dormant-seeded lawn can mature as much as a month sooner in spring than a spring-seeded one, because part of the germination process starts before winter.

How to do it: Minnesota says to bag fallen leaves first so the seed reaches the soil, spread in dry conditions (a drop spreader for large areas), sow half the seed in each of two directions, and skip raking it in; the freeze and thaw cycle settles the seed into the soil. Nebraska gets better results by preparing the soil in fall with core aeration or power raking, and says never to seed on top of snow. In spring, keep the seedlings from drying out; Nebraska starts watering 2 to 4 times a day in late April.

The catches: Minnesota warns that most crabgrass preventers cannot be used on a dormant seeding, and Nebraska names siduron, sold as Tupersan, as the one pre-emergent that still lets grass seed germinate, applied from mid-April to the first week of May rather than with the seed. A warm spell that starts germination and then a hard freeze can kill seedlings, and steady snow cover protects them best (Nebraska). Michigan State adds that dormant seed sown with an overseeder runs a greater risk of rotting or being eaten by insects such as grubs. None of the six bags here gives dormant-seeding directions, and Thick'R's label says to apply it only to actively growing turf, so save it for spring; Minnesota says dormant seeding works with every cool-season lawn grass it grows, Kentucky bluegrass, tall fescue and the fine fescues among them.

How to read a grass seed label

Every bag carries a label, and UConn's guide to it lists the parts in the order they appear:

• Purity: the percent by weight of each species in the bag.
• Variety: the cultivar of each species. Kansas State points to National Turfgrass Evaluation Program trial data to see which cultivars do well in your area.
• Germination: the percent of the pure seed expected to sprout. UConn says most grass seed should be 85 percent or better.
• Other crop: seed of cash crops such as clover, timothy and bentgrass, which count as weeds in a lawn.
• Weed seed: under 1 percent is the target, 0 the ideal, by UConn's account.
• Noxious weeds: the best seed reads "None Found".
• Inert matter: chaff and other material that will not grow. UConn notes that a coating's weight also shows on the label.
• Date tested: look for a germination test from the current year.

Multiply purity by germination for the share of live seed: UConn's example of 90 percent purity at 90 percent germination comes to 81 percent. Nebraska adds two things to watch for, seed listed as VNS (variety not stated) and annual ryegrass in a mix meant for a permanent lawn, and suggests certified seed with a blue tag. NC State says to buy seed free of noxious weed seed and low in other crop seed.

How to overseed, step by step

1. Test the soil if you have not lately. Bob Vila's overseeding tips and Nebraska both suggest a soil test before seeding; our soil test kit guide covers mail-in labs and home kits.
2. Mow low and clear the surface. Iowa State mows to 1.5 to 2 inches before overseeding, and Scotts says about 2 inches; rake out dead grass and debris. NC State's advice is to seed before leaf drop.
3. Open the soil. Seed has to touch soil. Iowa State makes three or four passes with a core aerator, for 20 to 40 holes in every square foot, then drags the lawn to break up the cores, or uses a vertical mower or a slit seeder, all of which some garden centers and rental stores rent. Kansas State's Johnson County office prefers verticutting and says core aeration gives a less uniform stand for overseeding; Michigan State favors a slit seeder. Our lawn aerator guide covers core and spike aerators.
4. Spread in two directions. NC State spreads half the seed one way, then the rest crosswise. Use the overseeding setting printed on the bag; our fertilizer spreader guide covers broadcast, handheld and tow-behind spreaders for seed and feed.
5. Feed the seedlings. Picks 1, 2, 3, 4 and 6 carry fertilizer in the bag; for pick 5, Pennington says to apply a starter fertilizer. Iowa State fertilizes about 6 weeks after germination, with 1 lb of actual nitrogen for every 1,000 sq ft. Our fall lawn fertilizer guide covers the fall feedings and why a weed and feed stays off a lawn you have just overseeded.
6. Water lightly and often. Iowa State says watering at least once a day is usually necessary; Scotts says daily until the seedlings are 2 inches tall, and Bob Vila's tester needed two to three waterings daily for full-sun seed. A sprinkler on a timer helps; our lawn sprinkler guide sorts them by lawn size and shape and includes a hose timer.
7. Keep mowing, and wait on weed control. Iowa State keeps mowing at 1.5 to 2 inches to hold back the existing grass, then raises the height gradually to a final 3 inches once the seedlings are being cut. Hold off on weed control until the new grass is established (see the weed and feed question below).

Overseeding a bermuda lawn with ryegrass

Iowa State notes that sowing a cool-season grass into dormant warm-season turf is far more common in warmer states than in Iowa, and Clemson's fact sheet is the clearest guide to it. Clemson says overseeding home lawns is not generally recommended and, if done, should be on bermudagrass only, and the Texas A&M column warns against overseeding a bermuda lawn that is already thin. Ryegrass gives green cover when bermuda goes brown after frost, but it competes with the bermuda for water, light and nutrients and can slow its spring recovery unless you manage the handoff.

• Timing: Clemson overseeds about 30 days before the first frost; the Texas A&M column puts the San Antonio date at late October through November, after the first frost.
• Prep: the Texas A&M column suggests aerating about 30 days ahead if you can, then scalping the bermuda as low as the mower goes right before seeding, and it warns never to scalp St. Augustine.
• Rate: Clemson uses 5 lb of ryegrass per 1,000 sq ft into an established lawn, and 10 lb on bare ground used for erosion cover.
• Water: lightly, two to three times daily until the seed germinates, without washing it away (Clemson).
• Mowing: Clemson begins mowing ryegrass when it reaches roughly 1 to 2 inches, then holds it at 1 to 1.5 inches, and after the second mowing applies 0.5 lb of nitrogen for each 1,000 sq ft.
• Spring handoff: Clemson stops fertilizing the ryegrass by mid to late January, keeps the lawn on the dry side, and mows the ryegrass down to 1 inch in spring to weaken it so the bermuda can come back.

Related guides

• Best grass seed for shade: six mixes sorted by hours of sun.
• Best fall lawn fertilizer: what to feed and when, including a bag for a lawn you are overseeding.
• Best fertilizer spreaders: broadcast, handheld and tow-behind spreaders for seed and feed.
• Best lawn aerators: opening compacted soil before you seed.
• Best lawn sprinklers: keeping new seed moist.
• Best soil test kits: knowing what the soil needs before you seed.

Frequently asked questions

What is the best grass seed for overseeding?

For most cool-season lawns, Scotts Turf Builder Sun and Shade Mix: three fine fescues with Kentucky bluegrass and perennial ryegrass, at 2,240 sq ft of overseeding per 5.6 lb bag. For a thin lawn, Scotts Thick'R Lawn 3-in-1 Sun and Shade; for tall fescue, Scotts Tall Fescue Mix; for winter color on bermuda, Pennington Annual Ryegrass or, for finer turf, Pennington Smart Seed Perennial Ryegrass.

Can you overseed in November?

On a bermuda lawn it depends where: the Texas A&M Bexar County column puts San Antonio's ryegrass date at late October through November, while Clemson's South Carolina dates are earlier: early October for the Upstate, late October for the Midlands and the coast. In Minnesota and Michigan, November is when dormant seeding starts: sow once the soil is below 40 degrees F so the seed sprouts in spring (Minnesota: early November to mid-March; Michigan State: usually November), and Nebraska Extension in Lancaster County prefers mid-December through mid-February. Minnesota's turf team warns that seedlings which sprout just before winter generally die, so a late seeding that germinates is the risky case.

How much grass seed do I need to overseed?

Follow the bag's overseeding coverage, which for these six picks runs from 2 lb to 10 lb per 1,000 sq ft because some bags include fertilizer and soil improver. For raw seed, extension rates are roughly half of a new-lawn rate: about 1 to 2 lb of Kentucky bluegrass or 3 to 4 lb of tall fescue per 1,000 sq ft (Nebraska), and 5 lb of ryegrass over bermuda (Clemson).

Should I overseed with the same grass I already have?

Usually, yes: a tall fescue lawn gets tall fescue and a bluegrass lawn gets a bluegrass mix, so new patches blend in. The exceptions are deliberate: ryegrass for winter color on bermuda, or adding turf-type tall fescue to a drought-thinned bluegrass lawn, as a University of Minnesota turf team article describes.

Do I need to aerate before overseeding?

You need seed-to-soil contact, and aeration is one way to get it. Iowa State uses a core aerator, a vertical mower or a slit seeder; Kansas State's Johnson County office prefers verticutting for overseeding, and Michigan State favors a slit seeder. At the least, Scotts and Pennington both say to rake to loosen the soil before you spread.

How often should I water after overseeding?

Lightly and often until the seed sprouts: at least once a day by Iowa State's guidance, and two to three times daily for full-sun seed in Bob Vila's test. Scotts' instruction is daily watering, or as needed, until the new grass stands 2 inches tall.

Can I use weed and feed when I overseed?

Not on a new seeding, by the sources we read. Thick'R's label says to hold weed control until the new grass has been mowed at least four times; Minnesota notes that most crabgrass preventers cannot be used on a dormant seeding because they affect the seed; and Nebraska names siduron (Tupersan) as the one pre-emergent that still lets grass seed germinate. Our fall lawn fertilizer guide covers why a weed and feed stays off new seed.

The bottom line

Overseed with the grass you already grow, at the bag's overseeding rate, in your region's window. For most northern and mixed lawns that means Scotts Turf Builder Sun and Shade Mix in late summer or early fall, or, with a dormant seeding, November in Minnesota and Michigan and mid-December in Nebraska; for a thin lawn, Thick'R Lawn in early fall or spring; for tall fescue, Scotts' Tall Fescue Mix by your state's cutoff; for a worn yard, the High Traffic Mix; and for a bermuda lawn you want green this winter, Pennington's annual ryegrass, or its perennial ryegrass for finer turf.

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