Learning Center / Timing and seasons
How do you keep a fescue lawn alive through summer?
Mow it tall, water it deeply in the early morning, keep an eye out for brown patch, and don't feed it. Summer is about getting fescue through the heat so fall can rebuild it.
- By David Obeid, founder
- Reviewed
- 5 min read
The short answer
Why do fescue lawns struggle in summer?
Tall fescue is a cool-season grass, so Northern Virginia heat slows it down and stresses it. It is still the right grass for this area, because the warm-season grasses that love summer go brown all winter here. It just needs help through July and August.
Some dulling in a hot, dry stretch is normal. Spreading patches, bare soil, or browning that gets worse after rain usually means disease or damage worth catching early. How to tell what is causing summer browning.
The summer list
What should you do for a lawn in summer?
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Mow tall
Keep fescue at about 3.5 to 4 inches, or taller in the heat. A taller lawn shades the soil, keeps the plant cool, drives deeper roots and crowds out crabgrass.
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Never take off more than a third
A big catch-up cut in July can scalp a stressed lawn. Weekly mowing keeps every cut small.
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Keep blades sharp and mow dry grass
Sharp blades cut cleanly instead of tearing, which lowers disease pressure. Mowing wet grass can spread disease from one part of the lawn to another.
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Water deeply in the early morning
About an inch a week, rain included, in one or two deep soakings. How much to water, and how to measure it.
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Skip the fertilizer
Feeding fescue in summer pushes soft growth it can't support in the heat. Save it for fall.
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Watch for grubs and pests
Our lawn program includes grub control, which also covers fleas, ants and ticks.
Drought
How can you tell if your lawn needs water?
Grass that turns dull blue-gray or straw-colored, and footprints that stay pressed into the lawn instead of springing back, are the usual signs. That is the lawn telling you it is short on water.
Water deeply when you see it, early in the morning. Light evening sprinkles keep roots shallow and leave the grass wet overnight, which invites disease.
Disease
When is lawn disease most likely?
In stretches of hot days, warm nights and humid air, which Northern Virginia summers have plenty of. Brown patch is the classic one for tall fescue: tan, roughly circular patches that spread fast in muggy weather.
Our disease prevention program runs five applications about three weeks apart from May into September. It prevents disease; grass that has already died needs reseeding in the fall. More on lawn disease.
Looking ahead
What should you plan in late summer?
Fall. The aeration and overseeding window opens in August, and the best seeding weather here runs from mid-September into October. If summer thinned the lawn, book it now so it lands in the right window. Here is what fall should look like.
Related questions
What people also ask
What height should tall fescue be mowed in summer?
About 3.5 to 4 inches, and even taller through summer heat.
Should I fertilize my lawn in summer?
Not a tall fescue lawn. Heavy feeding in summer mostly pushes soft growth that invites trouble. Fall is the most important feeding window for fescue.
What is brown patch?
A fungal lawn disease that shows up as tan, roughly circular patches in hot, humid weather. It is the most common summer disease in tall fescue lawns like the ones across Northern Virginia.
Do you mow less often in summer?
We mow weekly through the season. Fescue slows down in midsummer heat, and keeping every cut small is what keeps a stressed lawn from being scalped.
Keep reading
More from the Learning Center
- What should you do for your lawn each season in Northern Virginia? A season-by-season lawn calendar for tall fescue: what happens in winter, spring, summer and fall, and which season matters most. Timing and seasons · 6 min read
- Why shouldn't you leave leaves on your lawn all winter? What a wet mat of leaves does to a fescue lawn, why beds and walkways need clearing too, and why one cleanup in November is not enough here. Timing and seasons · 5 min read
- Should you mow your lawn shorter before winter? Why the last mows of the season should drop to about 3 to 3 1/2 inches: a long lawn traps leaves and debris over winter. Lower, never scalped. Timing and seasons · 4 min read
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