Why Is My Grass Turning Yellow? 15 Solutions to Try

Wondering why your grass is turning yellow? Yellow spots on your lawn may indicate that action is necessary to return your grass to a healthy condition. Then again, yellowing lawn spots may be perfectly normal. 

Either way, diagnosing the problem that's killing your lawn, or determining that there's no trouble at all, can tell you how to remedy the situation and get you back to enjoying your lawn worry-free. For help pinpointing the issue, consult a local lawn treatment service to get an expert opinion.

1. Too Much or Too Little Water

Watering the grass is the most fundamental task in keeping your lawn healthy. Although your lawn can suffer from having too little water, too much can be even worse. Patches or large areas of grass that turn pale and start to yellow while displaying a thinning appearance are signs that it needs more water. On the other hand, a lawn that receives too much water will turn yellow because of other causes that result from overwatering. 

How to Fix Water Quantity Problems

Repairing your too-dry lawn is a simple fix. Watering your lawn more frequently will quickly reverse the condition. Although the yellow grass blades won't become green again, new, more lively-looking grass will replace them quickly. 

Lawns with damage from overwatering likely have other issues that need resolution, too. Overwatering dilutes the nutrients in the soil and leaves the grass weak and prone to fungus, lawn pests, and weeds. Allow the lawn to dry out and address the remaining issues to return your yard to a green state. A simple fix is to install a sprinkler system that you can program to water your lawn at regular intervals.  

2. Too Much or Too Little Fertilizer

Your lawn needs the right mix of nutrients to keep it healthy. If you add too much lawn fertilizer, your grass can develop yellow or brown tips, wilt easily without water present, and start to look thinner. Too many nutrients, specifically nitrogen, and your lawn can become 'burned.' The affected areas will turn yellow and brown and perish in severe cases.  

How to Remedy Fertilizer Trouble

If your grass is undernourished, apply a nitrogen-rich fertilizer designed to revive your lawn at your earliest convenience and establish a feeding schedule for your yard. 

Repairing an over-fertilized lawn can be more challenging. If you have only minor damage, slightly overwatering your yard for a few days to dilute excess nitrogen will likely help the grass heal itself. Severe cases may require you to rake and remove the dead and dying grass and reseed your yard. To reduce the chances of over or under-feeding your lawn, carefully follow the directions and recommendations for the fertilizer you choose.

3. Pet Urine Damage

Small patches of yellow and dying grass surrounded by seemingly healthy, bright-green blades are typically memories, etched in the grass, of your dog relieving themself in that location. Dog urine kills grass because it contains nitrogen and can over-fertilize spots in your yard.  

How to Neutralize Pet Urine

Unfortunately, the only way to repair the dead spots is to reseed your lawn, specifically the affected areas. To keep new spots from forming while still allowing your dog to wander free in the yard, follow closely behind with a garden hose and immediately saturate the area they choose to use as a restroom to dilute the new nitrogen.

For more convenient prevention of dog spots, you can encourage your pet to relieve themselves in a designated area, adjust the amount of fertilizer you apply to that part of the lawn, or slightly overwater your yard if it can support the extra moisture without causing other damage. 

4. Poor Soil Conditions

Poor soil conditions is a general term that means the soil isn't, or is no longer, ideal for growing grass. Lawn areas with heavy foot traffic or too much water can compact over time and limit strong grass root growth, causing lawn yellowing and thinning. Inadequate nutrient supply in the soil causes damage that appears similar. If soil is too acidic, many grasses will turn yellow in response.

How to Repair Poor Soil Conditions

How you repair your poor soil conditions depends on what kind of soil problem exists. Compacted soil is repairable by aerating your lawn, reseeding, and developing a regular aeration schedule if the area is still subject to heavy use. 

Determining what nutrients are lacking in your soil can be tricky. Test your soil to determine what nutrients you need to add and how to adjust the pH level to keep your lawn in top shape. Then, hire a local lawn treatment service to provide the advanced services necessary to restore your soil and lawn to its former condition.

5. Lawn Diseases

Lawn fungus and disease are more common than you might think. They come in various forms, with names like fairy circles, yellow spot, rust, blight, and dollar spot. Some of them are treatable and preventable, while others aren't. Luckily, rust and fairy rings are easily identifiable by their telltale signatures of rusty blades or circles of oddly-colored grass. Often, diseases start in a single, small location and spread. 

How to Prevent and Cure Lawn Diseases

If you can identify the type of fungus damaging your yard, you may be able to find a fungicide that can remedy the situation in the short term. A more long-term solution is to prevent fungus growth by following a lawn care maintenance checklist each season that includes aeration and consistent watering. 

6. Insect Infestation

Grubs, cutworms, leatherjackets, webworms, and more make up the army of pests that can damage your lawn in chunks or as a whole. Yellowing and sometimes dead spots are the result of this common lawn problem. These pests are typically insect larvae that feed on the roots of your grass. Sometimes you can see the critters within or under the lawn thatch.  

How to Treat Insect Infestations

Identification is key to treating an infestation. Once you determine what kind of insect larvae your lawn is harboring, finding the applicable pesticide at your lawn care or home center is simple. However, better ways to handle the situation include hiring a professional lawn care company to address and prevent larvae from returning or following a proper lawn care schedule. 

7. Dull Lawn Mower Blades

It's true: How we maintain our lawnmowers can affect the health of our yards. Dull blades or blades with extensive damage on a lawnmower breaks and crushes the grass tips instead of neatly trimming each one. You can identify the trouble by noticing dead and dried-out cut ends of grass that may split open, leaving them ripe for other problems and diseases. As long as we're talking lawn tool maintenance—dripping oil from a leaking mower can also create dead spots in your yard. 

How to Repair Mower Blade Damage

Sharpening your lawn mower blades, either as a DIY project or by taking your mower to a local lawn mower repair pro, will immediately stop the damage from worsening. To speed the healing, consider adding nitrogen-rich fertilizer if it's been a while since the last feeding. 

To avoid future damage, sharpen your lawn mower blades every 25 to 30 mowing hours, raise the cutting deck to about three inches to leave enough grass behind to promote healing, and avoid mowing during excessively hot or dry weather.  

8. Cold Weather

Even in moderate climates, but especially in cold locations, your lawn may go dormant and turn pale green or yellow during cold weather. It can appear to dry out and may look thin during this time. 

How to Handle Cold Weather

A dormant lawn requires little care, and you can essentially ignore it until it begins growing again. Avoid overwatering and mowing your lawn during this time. Avoid walking on grass with frost on its surface to keep from breaking the fragile blades. 

9. Heat Damage

When grass bakes in the sun, it doesn’t always turn a burnt brown. Many grass species will turn yellow from the heat as they dry out and their healthy cells are damaged.

Direct sunlight can cause heat damage during the height of summer, especially if your lawn isn’t adequately watered. But heat damage can have other causes, too. If you accidentally leave a tarp or plastic cover over the grass on a summer day, you may find that the grass underneath died after only a few hours. Thick coverings can trap heat against the grass, quickly rising temperatures and killing the part of the lawn underneath. Awkward yellow sections often result. 

How to Deal with Heat Damage

Never leave heavy coverings on your lawn for more than several minutes at a time, especially during the summer. Keep your lawn well irrigated in the hot months.

10. Too Much Shade 

Some grass species, including rough bluegrass and fescue, have no problem with shade and even thrive in it. But many lawn-friendly grass species don’t grow well in the shade. If the grass is surrounded by trees, rooftops, and fences, it may not get the hours of sunlight it needs, causing grass to die, often yellowing as it goes.

How to Handle Too Much Shade

Always research the type of grass species that will work best in your yard before buying sod or planting seeds. Match the grass to your climate and the shade level of your backyard. It’s worth keeping an eye on the lawn during the weekend and estimating how many hours of sun it gets.

11. Accidental Chemical Poisoning

While grass can suffer from over-fertilization, there’s a more insidious killer: Accidental chemical runoff. Two common causes include salt and de-icer runoff that soaks into the ground during the winter and ruins the borders of lawns in spring, and chlorinated pool water splashed on grass from nearby pools or hot tubs. However, other types of runoff from exterior painting and construction can cause similar effects. In these cases, borders and splotches on the lawn will turn yellow.

How to Deal with Accidental Poisoning

Always be wary of runoff that soaks directly into your lawn, and avoid it when possible. Avoid the use of harsh chemicals near or on the lawn.

12. Iron Chlorosis

This technical-sounding term means that grass isn’t getting enough iron to produce chlorophyll, leading to yellowing and lawn death. Some fertilizers can help, but not all lawn fertilizers include iron, and certain grass species may be more vulnerable than others. Iron chlorosis is more likely in acidic soils, over-watered soil, and compacted soil that starves plants of nutrients. This problem is more common in southwestern regions of the United States.

How to Handle Iron Chlorosis

Test your soil’s iron levels and provide the right fertilizer for the grass. Aerate your lawn on a regular schedule, and avoid overwatering in between lawn services.

13. Objects are Blocking the Sun

Even if your home’s location doesn’t experience very hot summers, objects that block the lawn from the sun can cause long-term problems. This grass killer happens most often with things that sit on the lawn for several weeks, including lawn chairs, inflatable pools, larger toys, and more. It can also happen if your yard gets a heavy cover of leaves in the fall and the leaves clump and linger through spring.

How to Prevent Blocking the Sun

Remove objects from the lawn after you finish using them. Remove thick leaf layers in a timely manner for healthy spring growth.

14. You’re Cutting the Lawn Too Short

Grass species thrive at different lengths. Not all grasses will thrive at short lengths, like one inch high. If the grass can’t attain enough growth to absorb necessary sunlight, it may start to yellow and fade over time.

How to Deal With Cutting a Lawn Too Short

Research your grass species and the best height to keep it healthy. The recommended grass height for most species is two to three inches tall, but some varieties, like Bermuda grass, require a shorter cut.

15. Weedy Competition After Winter

It can be alarming to see grass starting to yellow during spring when most grass species hit a healthy, green growth spurt. But it’s not uncommon, especially in wetter climates. Over the winter, grass tends to go dormant and other competitive plants can start to creep in. Invasive, non-native species, mosses, and weeds can grow into grass, competing for resources. If they’re significantly stronger than grass at the start of spring, the lawn may starve for nutrients, resulting in yellowed grass around the newcomers.

How to Handle Invasive Weeds in Spring

Keep your lawn healthy and well-maintained to avoid competitors encroaching. Use lawn feed and fertilizers that encourage your grass while killing weeds and moss. Look for treatments for removing weedy intruders, usually with the description “moss and fungus control” or similar words. Aerate your lawn regularly so your grass can maintain strong growth.