Summer crabgrass thrives in heat, but timing your attack matters more than the product you choose. If you are searching for how to get rid of crabgrass in the summer, you likely already see those ugly, light-green clumps spreading across your lawn. The good news is that you can still fight back, even when temperatures are high.
This guide gives you a clear, step-by-step plan to remove crabgrass without destroying your turf. We will cover manual removal, targeted herbicides, and lawn repair methods that work in hot weather. Let’s get your yard back under control.
Why Crabgrass Explodes In Summer Heat
Crabgrass is a warm-season annual weed. It germinates in spring when soil temps hit 55°F, but it grows aggressively when the mercury rises. Summer heat is its favorite time to spread seeds and choke out your good grass.
Understanding this growth cycle is key. If you just pull the weed without fixing the underlying conditions, it will return next year. The plant is designed to survive drought and heat, so your regular grass often suffers while crabgrass thrives.
Identify Crabgrass Before You Act
Before you treat anything, make sure you are dealing with crabgrass. It looks like a coarse, spreading grass with wide blades. The stems grow outward from a central point, resembling a crab’s legs.
- Leaf blades are wider than regular turf grass
- Color is lighter green or yellow-green
- Grows in low, flat clumps
- Produces thick, finger-like seed heads in mid-summer
If you see these signs, proceed with the removal plan below. If you are unsure, check the base of the plant. Crabgrass roots are shallow and whitish, making it easy to pull.
How To Get Rid Of Crabgrass In The Summer
Now for the main event. The strategy changes depending on how much crabgrass you have. For small patches, hand pulling works. For larger infestations, you need a selective post-emergent herbicide. Here is the full breakdown.
Method 1: Hand Pulling For Small Patches
If you have less than a dozen plants, grab a bucket and start pulling. The best time to do this is after a rain or early morning when the soil is moist. Dry soil makes the roots break off, leaving the plant to regrow.
- Loosen the soil around the base with a dandelion digger or screwdriver
- Grasp the crabgrass at the base, not the tips
- Pull slowly and steadily to get the entire root system
- Place the weed in a bucket, not on the lawn
- Firm the soil back down with your foot
Do not compost pulled crabgrass if it has seed heads. The seeds survive composting and will spread when you use the compost. Bag it and throw it in the trash instead.
Hand pulling is tedious but effective. It gives you instant results and avoids chemicals. Just be prepared to repeat the process every few days until the seed bank is exhausted.
Method 2: Selective Herbicides For Large Infestations
When crabgrass covers more than 10% of your lawn, pulling is impractical. You need a post-emergent herbicide that targets crabgrass without killing your desired turf. Look for products containing quinclorac, fenoxaprop, or dithiopyr.
Read the label carefully. Some herbicides are safe for cool-season grasses like fescue and bluegrass. Others are only safe for warm-season grasses like Bermuda or Zoysia. Using the wrong one will nuke your entire yard.
How To Apply Herbicide Safely In Heat
Summer heat can stress your lawn. Applying herbicide during a heatwave can cause additional damage. Follow these rules to minimize risk:
- Apply when temps are below 85°F, ideally in the early morning
- Do not apply if rain is expected within 24 hours
- Water your lawn 24 hours before application to reduce stress
- Wait 48 hours before mowing after treatment
- Do not spray on windy days to avoid drift onto flowers or shrubs
You will see results in 7 to 14 days. The crabgrass will turn yellow, then brown, then die. Do not expect instant death; these products work slowly in hot weather.
Method 3: Vinegar And Natural Solutions
If you prefer non-chemical methods, household vinegar can work on young crabgrass. However, it is non-selective, meaning it kills everything it touches. Use it only for spot treatments on driveways or patios, not on the lawn itself.
For a stronger natural mix, combine one gallon of white vinegar, one cup of salt, and one tablespoon of dish soap. Spray this directly on crabgrass leaves on a sunny day. The salt dries out the plant, but it also sterilizes the soil for months.
Use this mix sparingly. It will leave bare spots that require reseeding. It is a good option for cracks in pavement but poor for lawn repair.
What To Do After The Crabgrass Dies
Killing crabgrass is only half the battle. The bare soil left behind is prime real estate for new weeds. You must repair the lawn quickly to prevent a second wave of crabgrass or other invaders.
Step 1: Remove Dead Debris
Once the crabgrass is brown and crispy, rake it out. Dead plant material blocks sunlight and prevents new grass seed from reaching the soil. Use a stiff rake to pull out the debris and loosen the top 1/4 inch of soil.
This step also helps aerate the soil slightly, which is beneficial in compacted areas. Do not till deeply; you will bring more weed seeds to the surface.
Step 2: Overseed With The Right Grass
Summer is a tough time to establish new grass. Cool-season grasses struggle in July and August heat. If you live in the north, wait until late August or early September to overseed. For warm-season lawns, you can overseed now, but it will take longer to germinate.
Choose a high-quality seed that matches your existing lawn. Spread it at the rate recommended on the bag. Cover with a thin layer of peat moss or straw to retain moisture.
Water lightly twice a day to keep the soil surface moist. Do not let it dry out completely. Germination takes 10 to 21 days depending on the grass type.
Step 3: Water Deeply And Infrequently
After the new grass is established, change your watering habits. Crabgrass loves shallow, frequent watering. Your good grass prefers deep, infrequent drinks. Water 1 to 1.5 inches per week, all at once.
This encourages deep root growth. Deep roots make your lawn more drought-tolerant and competitive against weeds. Use a rain gauge or a tuna can to measure your sprinkler output.
Preventing Crabgrass Next Summer
The best way to deal with summer crabgrass is to stop it before it starts. A healthy, dense lawn crowds out weeds naturally. Here is your prevention checklist for fall and spring.
Apply Pre-Emergent In Spring
Pre-emergent herbicides create a barrier in the soil that stops crabgrass seeds from germinating. Apply it when soil temperatures reach 55°F for three consecutive days. This usually happens when forsythia bushes are blooming.
Do not apply pre-emergent if you plan to overseed in the same season. The barrier prevents good grass seed from sprouting too. Time your applications carefully.
Mow High And Frequently
Set your mower blade to the highest setting for your grass type. Taller grass shades the soil, keeping it cooler and preventing crabgrass seeds from germinating. Never cut more than 1/3 of the grass blade at once.
Keep your mower blades sharp. Dull blades tear the grass, leaving jagged edges that turn brown and invite disease. Sharp blades cut cleanly and promote faster recovery.
Fertilize Properly
Crabgrass thrives in poor, compacted soil. A healthy lawn needs balanced nutrition. Test your soil every few years to know exactly what it lacks. Apply fertilizer based on the test results, not on a fixed schedule.
Avoid high-nitrogen fertilizers in late spring. They feed the crabgrass as much as your lawn. Use a slow-release formula that feeds your grass gradually.
Common Mistakes To Avoid
Many homeowners make the problem worse by using the wrong approach. Here are the most common errors and how to avoid them.
Mistake 1: Pulling In Dry Soil
Pulling crabgrass from dry soil breaks the roots. The plant regrows within a week. Always water the area first or pull after rain. You want the entire root to come out in one piece.
Mistake 2: Using Non-Selective Herbicide On The Lawn
Glyphosate (Roundup) kills everything. It is not selective. If you spray it on crabgrass in your lawn, you will also kill your good grass. Use it only for spot treatments on hardscapes.
Mistake 3: Applying Herbicide During A Heatwave
Herbicides stress plants. Applying them during 95°F heat can kill your turf along with the weed. Wait for a cooler day or apply in the early morning when temps are lower.
Mistake 4: Ignoring The Seed Bank
One crabgrass plant produces up to 150,000 seeds. Those seeds can stay viable in the soil for years. Even if you kill the current plants, new ones will sprout next year. This is why pre-emergent is so important.
Frequently Asked Questions
Can I Kill Crabgrass In July?
Yes, you can kill crabgrass in July using a selective post-emergent herbicide. The heat makes the weed more vulnerable, but it also stresses your lawn. Apply early in the morning and water well beforehand.
Does Pulling Crabgrass Make It Spread?
No, pulling crabgrass does not make it spread, unless you pull it when it has seed heads and shake them around. Pulling is safe and effective for small patches. Just remove the plant completely and dispose of it properly.
What Kills Crabgrass The Fastest?
Quinclorac-based herbicides are the fastest acting on crabgrass. They show visible results in 7 to 10 days. Natural solutions like vinegar work faster but kill everything they touch.
Will Crabgrass Die On Its Own In August?
Crabgrass will die on its own after the first hard frost in fall. However, it will drop thousands of seeds before dying. Do not wait for frost; kill it now to reduce next year’s problem.
Can I Reseed Over Dead Crabgrass?
You can reseed over dead crabgrass, but you must remove the dead debris first. Rake the area thoroughly to expose the soil. Then overseed and water consistently. Do not reseed if you applied a pre-emergent recently.
Final Thoughts On Summer Crabgrass Control
Dealing with crabgrass in the summer is frustrating, but it is not impossible. Start by identifying the extent of the problem. Pull small patches by hand, use selective herbicides for larger areas, and always repair the soil afterward.
Remember that prevention is your best ally. A thick, healthy lawn with proper mowing and watering will naturally resist crabgrass invasion. Apply pre-emergent next spring to stop the cycle before it begins.
Take action this week. The longer you wait, the more seeds the crabgrass will drop. With consistent effort, you can enjoy a weed-free lawn for the rest of the summer and beyond.