6 Essential Lawn Care Tasks to Complete Before August Ends

Key Takeaways

Many lawn care tasks should be completed during the short window between late summer and early fall.

Warm- and cool-season grasses differ in when and how to mow, seed, and fertilize.

August is a key month of recovery for cool-season lawns and active growth for warm-season ones.

Mid to late August is one of the most important times to give your yard a boost with some scheduled lawn maintenance. As summer heat peaks and the cooler fall weather approaches, your lawn may be showing signs of stress like brown patches or thinning grass, which can be addressed now.

Tasks like overseeding, aerating, and applying the right nutrients can help repair summer damage and prepare your grass to go dormant in the winter. We asked a couple of lawn care experts what you absolutely need to tackle before the end of August to ensure your lawn looks its best through fall and beyond.

Related: 5 Lawn Care Mistakes That Are Making Your Yard Look Worse

01 of 06

Sharpen Your Mower Blade

Late August lawn care includes high-impact tasks to encourage growth, but don’t forget about basic mower maintenance. “Fall is a key season for lawn care—it’s a great time to grow new grass and to eradicate weeds from their roots to lessen how many come back the following spring,” says Craig Elworthy, a lawn care expert and the founder of Lawnbright. But even the best fall prep won’t make an impact if your mower is tearing through your grass.

To prepare for that fall growth window, Elworthy says you should sharpen your mower blade now—a project many homeowners overlook by late summer. “At this point in the season, your blade is likely a little dull, and a dull blade can leave jagged grass, which opens it up to disease. A sharp blade and a clean cut helps protect your turf,” he says. Make this step a priority so you’re not adding unnecessary stress to your lawn when it’s in recovery mode.

02 of 06

Mow on a Lower Setting

Once your mower blades are sharp, it’s time to adjust the height setting. “After a summer of mowing high, you’re ready to lower your mower blade and cut grass a bit shorter, especially if you are overseeding,” says Elworthy.

For cool-season grasses in zones 3 to 6, Elworthy says to start cutting at three inches in early August, which is down from the recommended four-inch height during the summer. Once you overseed (more on that later), set the mower to two inches just for that mow. “You want to get everything growing consistently, and then go back to three inches once it’s ready to be mowed post-overseeding,” he says. “You want to stick at three inches for the rest of the season.”

Elworthy explains that warm-season grasses grown in zones 8 to 10 can be mowed lower in the fall. Keep your mower setting at two or two and a half inches from early August until winter.

03 of 06

Aerate Your Lawn

The next lawn care step might be one you’ve never done before. “Aeration is an important but sometimes overlooked service that can significantly improve your lawn’s health,” says Rob Palmer, founder of the lawn care company Lawn Squad.

“If you’re in the southern U.S. with warm-season grass, August is a great time to aerate while your lawn is still actively growing.” Aerating now reduces soil compaction, improves water and nutrient absorption, and promotes deeper root growth, which Palmer says can have crucial benefits before the grass begins slowing down for fall. The task can also reduce thatch buildup and increase overall turf density going into cooler months.

For those with cool-season lawns in Northern or transitional zones, Palmer says it’s best to plan aeration for late August into early September. “Aerating just before your fall fertilization can help nutrients penetrate effectively and support stronger turf development going into the cooler months,” he says. “Skipping aeration, especially in compacted soils, can result in poor drainage, weak root systems, and patchy growth.”

Keep It Simple

According to Palmer, aerating is particularly beneficial for bermudagrass, zoysia, and St. Augustine lawns, which thrive with deeper root systems that are established late in the growing season.

Related: How to Know When Your Lawn Needs Dethatching—and the Best Time of Year to Do It

04 of 06

Overseed Grass at the Right Time

Elworthy says that people who live in cooler zones should overseed their grass at the end of August at the earliest. “In zones 3 through 6—the cool-season grasses in the North—late August to mid-September is go-time for overseeding and weed control,” says Elworthy. “Before you overseed, dethatch (if you have more than half an inch of thatch) and aerate to prep the ground.”

The end of August is a good initial target for cool-season grasses like fescues or ryegrass, but Palmer adds that you should avoid seeding during extreme heat or drought, as this leads to increased water demands and poor germination.

“If you live in a southern zone and are growing warm-season grasses, early August is generally the last chance to establish new growth through seeding before temperatures begin to drop,” says Palmer. “Warm-season grasses thrive in soil temperatures around 80 to 95 degrees, so seeding during this time can be successful if adequate moisture is available.”

05 of 06

Apply Fertilizer

Fertilization needs vary depending on your grass type and region. “In the southern U.S., warm-season grasses like bermudagrass, zoysia, centipede, and St. Augustine are actively growing in August,” says Palmer. “This makes late summer an ideal time for applying fertilizer, especially slow-release nitrogen products.”

As far as application, Palmer recommends a ½ pound of nitrogen per 1,000 square feet for zoysia and centipede lawns and up to 1 pound for bermudagrass and St. Augustine. “Just make sure not to fertilize too late into the season, as these grasses will soon begin to slow their growth,” he says.

On the other hand, homeowners in the North or in transition zones with cool-season grasses like Kentucky bluegrass, fescue, or ryegrass may want to hold off on major fertilization until early fall. “If necessary, a light summer feeding in early August can be done, but heavier applications should wait until September when these grasses begin their peak growing season,” says Palmer.

06 of 06

Consider a Watering Schedule

Some households might want to maintain a consistent watering schedule to keep their lawn green throughout August. “Most lawns need between one to two inches of water per week, either from rainfall or supplemental irrigation,” says Palmer. “In normal conditions, watering three mornings a week for about 20 to 30 minutes per zone typically meets the grass’s needs. However, during heatwaves or droughts, you may need to water daily or every other day for 45 to 60 minutes to replace moisture lost through evaporation.”

The best time to water is early in the morning, and Palmer says this is especially important in August when the sun is intense and soil conditions can dry out quickly. But there are a couple of caveats. First, you may not be allowed to water your lawn. “In regions experiencing water restrictions, the goal should be lawn preservation, not perfection,” says Palmer. “If a homeowner chooses not to water, they should shift their goal to maintaining turf viability rather than cosmetic greenness.”

If you can’t water your lawn, either because of local restrictions or self-imposed limits, Palmer recommends:

Mowing less frequently with a higher height (three to four inches) to provide shade to the soil and reduce water evaporation

Avoiding foot traffic to prevent stress on brittle grass

Topdressing with compost to naturally retain moisture and improve soil health

Letting the grass enter dormancy, a natural survival mechanism

Planning fall renovations (like overseeding or aeration) to rejuvenate the lawn when cooler, wetter conditions return

Related: The Best Time of Day to Water Your Lawn for Healthier, Greener Grass (and Lower Bills)

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