Late Summer Lawn Grass

Late summer is actually an ideal time to care for cool-season grasses like bluegrass, as cooler temperatures and increased rainfall support healthy growth. This is the single best time of year to fertilize your lawn, whether you prefer chemical or organic products, so if you only feed your grass once annually, do it now. Tackle dandelions and other broadleaf weeds with a weed-and-feed product or spot treatments while they are actively growing, which also reduces weed pressure heading into spring. Round out your late summer lawn care by overseeding any bare patches to establish strong turf before the season ends.

Bermuda grass is a warm-season turf best overseeded in late spring to early summer when soil temperatures reach at least 65 degrees Fahrenheit, typically in USDA zones 7 through 10. Scalp your existing lawn short, around half an inch, and rake to loosen the soil surface before broadcasting seed at a rate of about 1 to 1.5 pounds of hulled Bermuda seed per 1,000 square feet. Keep the seedbed consistently moist with light, frequent watering until germination occurs in 7 to 14 days, then gradually transition to deeper, less frequent irrigation to encourage strong root development.

St. Augustine grass is a warm-season turf best suited to the humid South and Gulf Coast regions (USDA Zones 8-10), and its late summer care differs from cool-season grasses like bluegrass. During this period, focus on maintaining a mowing height of 3 to 4 inches, keeping up with irrigation during dry spells, and applying a balanced fertilizer in early to mid-August before growth begins to slow. Avoid heavy fertilization after mid-August, as pushing new growth too late in the season can leave your lawn vulnerable to cold damage. For personalized product recommendations suited to your region, visit your local cooperative extension service or consult the lawn care experts at Nature Hills.

For a weed-free lawn without harming your grass, late summer is the ideal window to act, as broadleaved weeds like dandelions are actively growing and will absorb treatments most effectively. Use a weed and feed product to tackle widespread weed pressure, or spot treat problem areas with a targeted broadleaf herbicide if your grass is otherwise healthy. This timing also knocks out weeds before they can reseed for spring, giving you a head start on next year. Follow up with a lawn fertilizer application to strengthen your turf and help it fill in any bare spots left behind.

Growing grass in Arizona during summer presents unique challenges, as the intense heat and arid conditions are far outside the cool-season context where bluegrass and similar varieties thrive. In Arizona's low desert regions (USDA zones 9-10), warm-season grasses like Bermuda or Zoysia are your best options, as they can tolerate extreme heat and are typically established in spring before temperatures peak. For overseeding with cool-season ryegrass, wait until fall when daytime temperatures consistently drop below 90 degrees Fahrenheit. Contact your local Arizona Cooperative Extension office for region-specific grass variety recommendations and a watering schedule suited to your climate.

Water your lawn within 24 hours of applying fertilizer to help activate the nutrients and move them down into the root zone. For granular fertilizers, aim for about a quarter to half an inch of water, either from rainfall or irrigation. Watering too long after application can allow nutrients to volatilize or wash off before absorbing, reducing effectiveness. Set your sprinklers or plan around expected rainfall to ensure your lawn gets that initial drink right after feeding.

Bermuda grass is a warm-season turf that thrives in USDA zones 7-10, and the best time to overseed it is late spring through early summer when soil temperatures are consistently above 65 degrees Fahrenheit, typically between May and July. Overseeding during peak summer heat allows Bermuda grass seed to germinate quickly, usually within 7 to 14 days, and establish before cooler fall temperatures arrive. For best results, mow your existing lawn short, loosen the soil surface, spread seed at the recommended rate of about 1 to 1.5 pounds of hulled seed per 1,000 square feet, and keep the area consistently moist until the new grass is well established.

Yes, late summer is actually an ideal time to apply weed and feed products to your lawn, particularly for bluegrass and other cool-season grasses. Broadleaved weeds like dandelions are actively growing during this period, making them highly receptive to herbicide treatments, and tackling them now also helps prevent weed problems the following spring. Choose a weed and feed product suited to your grass type, apply it according to label directions, and follow up with overseeding any bare spots to round out your late-season lawn care.

You can continue mowing your lawn as long as it continues to actively grow, which for cool-season grasses like bluegrass typically means into October or even early November in many parts of the country. As temperatures drop in fall, gradually lower your mowing height to around 2 to 2.5 inches for your final cuts of the season, which helps prevent matting and reduces the risk of snow mold over winter. Keep mowing on a regular schedule until the grass goes dormant and stops growing, then put the mower away for the season.

Yes, late summer is actually the ideal time to fertilize your lawn, particularly for cool-season grasses like bluegrass. As temperatures begin to ease and rainfall becomes more consistent, grass is actively growing and will make excellent use of the nutrients. Whether you choose chemical or organic fertilizer, if you only apply once per year, late summer is the time to do it. Combine your fertilization with broadleaf weed treatment and overseeding any bare spots to get the most out of this prime lawn care window.