In this guide
Short answer
A bare spot is a small problem that grows if you leave it. Weeds move in first, because they always find open soil before grass does. Then the edges thin and the spot gets bigger.
Fixing one is cheap and takes about half an hour of work. The hard part is the waiting, and the daily watering. This guide is based on extension advice from Kentucky, Illinois, Colorado State, Nebraska, Iowa State and Georgia. I look after my own lawn with EGO battery tools, but for this job a garden rake and a hose do almost everything.
Step one: figure out what killed the grass
If you skip this, you’ll be reseeding the same spot every year. The University of Kentucky lists the usual suspects: turf disease, pet urine, spilled mower gasoline, fertilizer spills, heavy foot traffic and big rocks just under the surface.
Here’s how to tell them apart and what to do about each.
| Cause | What it looks like | Fix before seeding |
|---|---|---|
| Dog urine | Round brown spots, often with a dark green ring | Flush with water; remove dead turf and 0.5 to 1 inch of soil |
| Fertilizer or fuel spill | Sharp-edged dead patch, often a stripe or splash shape | Flush heavily with water; replace the top soil if it’s badly soaked |
| Foot traffic or compaction | Bare paths, shortcuts, play areas | Loosen soil; consider stepping stones or a path |
| Shade | Thin, weak grass slowly fading under trees | Shade-tolerant seed (fine fescue); thin tree branches; or a mulch bed |
| Grubs | Grass peels back like carpet; no roots | Confirm grubs, treat per label, then reseed |
| Rocks or debris | Spot browns fast in dry weather | Dig out the rock or debris; add soil |
| Disease | Irregular patches, often in humid weather | Identify it; adjust watering and mowing; reseed in season |
| Poor drainage | Spot stays wet or puddles | Improve grading; aerate |
Dog urine spots
Colorado State Extension explains that urine damage comes from a high concentration of nitrogen and salts in one small area. Larger dogs and dogs that squat leave more obvious spots.
Their advice: water is the only real neutralizer. They advise against baking soda, gypsum and dish soap. Flush the area well. If the grass is dead, remove the dead sod plus 0.5 to 1 inch of soil, then reseed or resod.
They also suggest matching the repair to the lawn:
- Kentucky bluegrass lawn: perennial ryegrass patches more reliably than bluegrass for spot repairs.
- Tall fescue lawn: use turf-type tall fescue.
- Fine fescue lawn: fine fescue; not ryegrass or tall fescue.
- Zoysia or bermuda: patch with sod, from a sod farm or from a hidden corner of your own lawn.
Spills
Kentucky’s advice for a fertilizer spill is to flush it with water right away. For gas or oil spilled while filling a mower, dig out any soil that still smells of fuel and replace it before you seed. Filling the mower on the driveway, or switching to a battery mower, ends this problem for good.
Grubs
Pull up a dead section. If it rolls back like a loose rug and you see C-shaped white larvae in the soil, grubs ate the roots. Iowa State says late June to early August is the best window for preventive grub control in lawns with a history of damage. Follow the product label.
Seed, sod or plugs?
| Method | Best for | Pros | Cons |
|---|---|---|---|
| Seed | Cool-season lawns; common bermuda | Cheapest; easy to match the lawn | Needs daily watering; slower; timing-sensitive |
| Sod patch | Any grass, especially zoysia and St. Augustine | Instant result; no germination wait | Costs more; can look different from the rest of the lawn |
| Plugs | Zoysia, St. Augustine, centipede | Cheaper than full sod; spreads to fill | Slow to cover; needs weed control while it fills |
The rule of thumb: if your grass spreads by runners (bermuda, zoysia, St. Augustine, centipede), a sod patch or plugs is usually easier than seed. If you have a cool-season lawn, seed is the simple choice.
For larger thin areas rather than spots, overseeding the whole lawn makes more sense. See how to overseed a lawn.
When to fix bare spots
Cool-season grass: early fall. Kentucky Extension says fall is best because warm days, warm soil and cool nights favor germination and give roots time to establish before the next summer. Nebraska and Iowa State put the window at mid-August to mid-September. Spring works as a backup, roughly April through mid-May.
Warm-season grass: late spring through summer, while the grass is actively growing. NC State says seed wants soil holding 65 to 70°F. UGA rates May through August as the best months for sodding and seeding bermuda.
Check the lawn care calendar for both grass groups by month.
What you’ll need
- A garden rake or hard-tined rake
- A shovel or flat spade (for removing dead sod)
- Grass seed that matches your lawn, or sod or plugs
- Topsoil or compost
- A hose with a gentle spray nozzle
- Optional: a sharp knife for cutting sod, starter fertilizer, a light layer of straw
How to fix a bare spot with seed
1. Clear the spot
Pull out dead grass, weeds and roots. If it’s a urine spot or a spill, dig out the top 0.5 to 1 inch of soil as Colorado State suggests.
2. Loosen the soil
Kentucky Extension says to break up the soil with a garden rake or similar tool. Go a little past the bare edge into the healthy grass so the new and old turf knit together. If the soil is hard as a sidewalk, dig it over a few inches deep with a shovel first.
3. Add soil and level it
Fill low spots so the patch sits level with the surrounding lawn. A patch that sits low collects water. One that sits high gets scalped by the mower.
4. Mix and spread the seed
Kentucky suggests mixing seed with topsoil or peat so it doesn’t clump, then broadcasting it over the spot. Illinois Extension gives a recipe: mix seed with a 50/50 blend of topsoil and compost at a 3:1 ratio, rake it in and keep it moist.
Use the rate on the seed bag. Too much seed makes crowded, weak seedlings. Pick a seed that matches the rest of your lawn. Our best grass seed guide lists options by grass type.
5. Tamp it down
Kentucky says to tamp the area to get good seed-to-soil contact. Press it with the back of the rake or step on a board laid across the spot. Seed that sits loose on top dries out.
A very thin layer of straw on top helps hold moisture. Iowa State suggests a light covering where about half the soil still shows through.
6. Water daily
Keep the top inch moist until the seed sprouts. Kentucky says water slowly and thoroughly so the soil stays moist but not soggy. In practice, a light watering once or twice a day, more on hot or windy days.
Use a gentle spray. A hard jet washes seed into one corner.
7. Wait it out
UC IPM’s germination times: perennial ryegrass 5 to 10 days, tall fescue 7 to 12, fine fescues 7 to 14, Kentucky bluegrass 14 to 30. Once seedlings are up, water a little less often but more deeply.
8. First mow
Kentucky says not to mow new grass until it’s at least 4 inches tall. Use a sharp blade so you don’t pull the seedlings out. How to mow a lawn covers heights for each grass type.
How to fix a bare spot with sod
- Cut out the damaged area in a clean square or rectangle. Squares are easier to fit sod into than ragged circles.
- Loosen the soil a few inches and level it. The new sod should sit even with the lawn, so remove soil to match the sod’s thickness.
- Cut sod to fit snugly, with edges pressed tight against the old grass. Gaps dry out first.
- Press it down so roots touch soil.
- Water deeply right away, then keep it moist until it roots. Lift a corner after a week or two; if it resists, roots are taking hold.
If you can’t buy a small amount of sod, Colorado State notes you can cut a patch from an out-of-the-way part of your own lawn, then reseed or let runners fill that spot.
How to fix a bare spot with plugs
Plugs are small squares or rounds of sod, common for zoysia, St. Augustine and centipede. Plant them in a grid into loosened soil, press them in firmly and water as you would sod. They spread outward to fill the gaps. Keep weeds pulled from the open soil between them while they fill in.
Don’t undo your work
Skip pre-emergent on seeded spots. Most crabgrass pre-emergents also stop grass seed. Nebraska notes only a few products, such as mesotrione, are safe at seeding. Check the label. See how to get rid of crabgrass for timing.
Hold off on weed killer until the new grass is established. The herbicide label tells you how long to wait.
Keep traffic off for a few weeks. A couple of stakes and string is enough of a reminder.
Fix the cause. If it’s a shortcut path, put in stepping stones. If it’s the dog, water the favorite spot after each visit.
FAQ
Can I just throw grass seed on bare spots?
It rarely works well. Seed on hard or crusted soil dries out or washes away. Rake the soil loose, spread the seed, tamp it down and keep it moist.
What is the best time to fix bare spots in the lawn?
Early fall for cool-season grass, roughly mid-August to mid-September. Late spring to early summer for warm-season grass, when the soil holds 65 to 70°F.
How long does it take for bare spots to fill in?
Seed sprouts in about 5 to 30 days depending on the grass, with ryegrass fastest and bluegrass slowest. The patch usually looks like the rest of the lawn after a few mowings. Sod looks finished on day one and roots in a couple of weeks.
Should I use topsoil or compost on bare spots?
Either helps, and a mix is common. Illinois Extension suggests a 50/50 topsoil and compost blend mixed with seed at a 3:1 ratio. Keep any covering thin so the seed isn't buried deep.
How do I fix dog urine spots in my lawn?
Flush the spot with plenty of water. If the grass is dead, remove it with 0.5 to 1 inch of soil, then reseed or patch with sod. Colorado State says water works and baking soda, gypsum and dish soap don't.
Why won't grass grow in one spot?
Usually compaction, deep shade, buried rocks or debris, poor drainage, or repeated damage from pets or traffic. Dig a few inches down to check the soil, and fix the cause before reseeding.
Can I patch a lawn in summer?
For warm-season grass, yes, summer is a good time. For cool-season grass, summer heat makes seed hard to establish, so it's better to wait for late summer or early fall.
Do I need starter fertilizer for bare spots?
It can help new grass, but it's optional for small patches. If you use one, follow the label rate, and don't combine it with a pre-emergent on a spot you've seeded unless the label says that's fine.