What Makes Grass Yellow And How Do I Fix It?

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Help! My Grass Has Big Yellow Spots, So How Do I Fix It?
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Home Outdoors Lawn Help! My Grass Has Big Yellow Spots, So How Do I Fix It?
Help! My Grass Has Big Yellow Spots, So How Do I Fix It?
Singjai20/Getty Images
Joe Churchill

By Joe Churchill

Family Handyman's Editorial Process

Updated on May 08, 2025

If you're seeing patches of yellow grass in your otherwise lush green lawn, here's what might be happening and how to fix it.

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It happens to most of us. You think you have this lawn care thing figured out. Then you notice “yellow” grass disrupting your masterpiece. Worse, the blemish seems to be taking on a life of its own. Here are seven things that can make your green grass turn yellow, plus a few solutions and tips for how to fix them.

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Over Fertilizing

Fertilizer is supposed to make your grass greener, but using too much of it can turn your lawn yellow instead. This is especially true when you use synthetic chemicals.

The Fix:

  1. Remove any excess fertilizer still present.
  2. Make sure to give the area adequate water.
  3. Plant new grass in the area if the over fertilized grass ended up dying.
  4. Care for the grass as you would the rest of your yard.

Dog Urine

Let’s start with a common culprit. If your dog always does its business in the same area of your lawn, you’ll probably start seeing the grass turn yellow. Dog urine contains salt. In high concentrations, salt kills grass. These dead areas usually show up in the spring after the snow melts and the rest of the grass begins to green.

The Fix:

  1. Remove the dead grass.
  2. Work up the exposed soil using a tool, such as a Garden Weasel Cultivator.
  3. Apply a generous amount of gypsum. Work it into the top two inches of soil. This will help neutralize the salt damage.
  4. Flush the spot with lots of water. This will help get the gypsum deep into the soil.
  5. Once the soil is workable, overseed with a quality grass seed mix. This is a convenient all-in-one kit that contains seed, mulch and a little fertilizer.

Soil Compaction

Compacted soil can cause all sorts of lawn problems. Vehicles, construction machinery and even lawn mowers following the same cutting pattern week after week are major culprits. Compaction squeezes pore space from the soil so it can’t absorb critical life support elements like water, nutrients and oxygen. When that happens, your grass suffers and can turn yellow as a result.

The Fix:

  1. Rent a core aerator for around $65/half day.
  2. Aerate when the soil is moist, not wet. Soft soil allows for deeper penetration of the coring tines. Make several passes over the yellow grass, punching as many holes in the area as possible. Don’t worry, you won’t harm the grass by aggressively aerating. Keep going until you see at least 12 holes per square foot of lawn.
  3. After they have dried, gently bust up the cores and work them back into the grass.
  4. Reseed the area with a quality seed mix suited for your climate and site conditions.
  5. Lightly top dress the seeded area with weed-free soil or compost.
  6. Water lightly and frequently as grass germinates and begins to grow.

Spilled Chemicals

We’ve all done it—accidentally spilling a weed killer on your lawn when filling your hand sprayer. That will almost certainly kill your grass. But acting quickly can minimizing the damage.

The Fix:

  1. If possible, soak up any remaining liquid on the surface by applying a highly absorbent material such as kitty litter, sawdust or calcined clay. Place in a plastic bag and dispose.
  2. You may be tempted to flush the spill area with water. Don’t! Flushing the area will only make the problem worse by spreading the chemical over a larger area.
  3. You’ll want to dig out the contaminated soil to a depth of six to 10 inches. How deep you need to excavate will depend on how deep the pesticide soaked into the soil.
  4. Backfill the hole with weed-free soil.
  5. Reseed the area as described earlier.

Grubs and Insects

Grub infestation can result in yellow grass. These tiny c-shaped “worms” (the larvae stage of many beetles) invisibly munch away at grass roots, severing them from the blades of grass above ground. Other insects, like chinch bugs and sod webworms, can feed on grass blades rather than the roots, killing your grass from the top down. Both grubs and surface-feeding insects can kill or severely damage your lawn, turning it yellow.

The Fix:

  1. Grubs can cause severe damage if left unchecked. Applying a preventative insecticide in early summer will keep them at bay. Grub control products that contain chlorantraniliprole do a great job and are pollinator-friendly, meaning they won’t harm bees, butterflies and other beneficial insects. Please strongly consider using a grub preventer containing this active ingredient. They’re much safer for the environment, humans and pets.
  2. Tiny insects can be hard to see. One way to determine if you have a heavy infestation of lawn-chewing insects like chinch bugs is to cut out the bottom of a coffee can, push it into the grass and fill it with water. Let the water soak into the ground (put a few drops of dish soap in the water to speed up the process). As the soapy water permeates the soil, the bugs will float to the surface of the water remaining in the can. How many bugs you see will help you determine if you have a chewing insect problem and how bad it is.
  3. Using safe lawn insecticides containing bifenthrin will provide good results when eliminating chewing insects.
  4. Most grub control products only work on grubs, so know which insect you’re targeting and choose your product wisely.

Lack of Nitrogen

Your lawn needs to be fed, just like you. When grass turns yellow, it may simply be hungry. Nitrogen, the first number of the fertilizer analysis, is what makes your lawn green. It’s an essential nutrient to keep your grass dense, weed-free and actively growing.

The Fix:

  1. Use a lawn food that contains a high percentage of nitrogen. It contains a lot of quickly available nitrogen fortified with five percent iron, which also turns your grass green. If you’d rather go the organic route, products like Milorganite Organic Nitrogen Fertilizer will green up your lawn nicely as well. It also contains a healthy dose of iron. (Note: Milorganite contains phosphorous. Some states and local regulations ban the use of phosphorus in lawn fertilizers. Check your state and local restrictions before using any lawn fertilizer containing it.)
  2. After applying fertilizer at the recommended rate, water it into the grass to activate. Then watch your lawn start to green up!

Too Much or Not Enough Water

Too much or not enough water can turn your lawn yellow or straw-colored. Too much water can drown grass roots and rob the soil of oxygen and that lush green color. Too little water will create drought symptoms that turn your lawn yellow or some shade of brown.

The Fix:

  1. Pay attention to the amount of water your lawn gets. That’s easier to do if you run an automated irrigation system. You can adjust the frequency and amount of water to fit weather conditions and the time of year.
  2. Pay attention to how often your system goes on. If it runs when it’s raining or when the ground is already moist, adjust the clock timer so you’re watering less frequently. Consider buying a simple and inexpensive soil moisture probe to make sure you’re not under- or over-watering.
  3. If you don’t have an automatic irrigation system, managing soil moisture can be a challenge. Focus your efforts on watering the dry, yellow grass. No need to water the entire lawn. There are many hose-end sprinklers to choose from. Select a model that best covers the shape and size of your dry area. You can also consider a smart sprinkler that can automate your hose-and-sprinkler lawn watering process for you.
Author Joe Churchill Joe Churchill is a self-proclaimed turf nerd with more than 40 years in the professional turf industry, working with professional grass growers from lawn care operators to pro league sports turf managers. His idea of a perfect workday is writing a fertility program or walking a baseball field with a client. He’s always happy to coach beleaguered ... Read More Joe Churchill Family Handyman Logo Search terms

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