Zoysiagrass Lawn Care Calendar for Virginia (Zone 7a)

Nitrogen Budget

For zoysiagrass in Virginia, aim for about 2 pounds of nitrogen per 1,000 square feet across the season, treating 3 pounds as the ceiling you don't want to cross. Split that total across two or three feedings rather than one large application, so the grass doesn't surge into weak, disease-prone growth. Confirm any product's label for its actual nitrogen percentage before calculating a rate.

Mowing Height Through the Season

Zoysiagrass in Virginia does best mowed to about 1½ inches through spring, summer, and fall — a height that sits inside the general 1 to 2 inch band for warm-season lawns. Whatever the season, never remove more than one-third of the blade in a single mow; if the lawn has gotten away from you, step the height down over two or three cuts instead of scalping it back in one pass.

In spring, a single low reset cut down to about 1 inch can clear out the previous year's dormant thatch and speed green-up. This is a once-a-year move, not a routine height — bag the clippings from that cut, then return to the normal 1½ inch mowing height for the rest of the season.

Spring: Pre-Emergent and Green-Up

The window for a pre-emergent herbicide application runs from March 22 to April 19, centered around April 5, timed to soil temperature climbing through 55°F. Applied in that window, it heads off summer annual weeds before they germinate, while the lawn is still filling in.

Once soil is consistently above 65°F and the lawn shows roughly half green-up, the window for the first fertilizer application of the year opens, running April 27 to May 25 and centered on May 11. Spring aeration follows once the lawn is actively growing — soil above 65°F and about three-quarters green — in a window from May 5 to June 16.

Seeding Window

If you're establishing or renovating a zoysiagrass lawn, the window runs May 25 to July 20, centered on June 22, once soil is reliably in the 65 to 70°F range and nights stay warm. Seeding this early gives the grass a full growing season to establish before it goes dormant. Zoysiagrass, like other warm-season grasses, should not be seeded in fall.

Watering

The general target is about ¾ inch of water a week, split into two deep soakings of about ½ inch each, applied early in the morning so the lawn dries before nightfall — wet grass overnight invites disease. In sustained heat, that weekly target rises: about a quarter inch more when highs run near the mid 80s, up to about half an inch more when three or more days push near 90, capped so the soil can absorb it without runoff. Watering deep and infrequently, rather than little and often, encourages roots to grow down instead of staying shallow.

Summer and Fall Care

Peak-growth feeding for the summer runs June 5 to July 17, centered on June 26 — match the rate to your grass, since some warm-season types need far less nitrogen than others. A wetting agent, applied before the heat peaks and reapplied as needed through the season (window: May 27 to July 26), can help water soak in rather than bead up and run off during the driest stretches.

Broadleaf weed control is best done once the lawn has fully greened up and weeds are actively growing, in a window from May 12 to June 29 — avoid applying above roughly 90°F or when the lawn is under drought stress, and confirm the label lists your grass type before spraying.

In early fall, a high-potassium, low-nitrogen application (window: August 14 to September 25, centered on September 4) helps the lawn harden off before dormancy. As soil cools through about 70°F, typically August 24 to September 29, a fall pre-emergent can stop winter annual weeds like annual bluegrass, henbit, and chickweed from germinating — but it also blocks grass seed, so it's one or the other, not both, if a fall overseed is planned. An annual soil test, taken any time from late July through late October while the grass is still active, is worth doing to guide lime and nutrient decisions for the following year. Grub damage is worth watching for, but a preventive treatment is only useful in the early summer window (May 22 to July 3) before eggs hatch, and only makes sense if grub damage has been a recurring problem.

Product Timing Conflicts

Herbicide and seeding timing can work against each other if the order isn't right. If you've recently applied a broadleaf herbicide, wait about six weeks (42 days) before seeding. If you've recently applied a crabgrass pre-emergent, wait about twelve weeks (84 days) before seeding — it doesn't distinguish between weed seed and grass seed. Plan any renovation around whichever product went down last.

Gear this schedule assumes

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Rain gauge

Any $10 gauge works. You need it to hit the 0.75 in/week target above without guessing.

Soil thermometer

The seed and pre-emergent windows above are soil-temperature windows — a $15 probe beats calendar guessing.

Broadcast spreader

Needed for even fertilizer and seed rates. A basic rotary spreader covers most lawns.

Oscillating sprinkler + hose timer

Enough to water deeply and consistently if you have no in-ground system.

Smart irrigation controller

Only if you have an in-ground system — a Rachio-style controller automates the watering schedule.

Treat these windows as a general framework rather than fixed dates — soil temperature and how the lawn is actually growing should guide the final call each season.

More guides

Zoysiagrass in other states

Arkansas · California · Georgia · Illinois · Maryland · Missouri · North Carolina · South Carolina · Tennessee · Texas

Other grasses in Virginia

Bermudagrass · Fine Fescue · Perennial Ryegrass · St. Augustinegrass · Tall Fescue