Zoysia Grass Lawn Care Schedule — USDA Zone 5

Timing: late March to early May

Warm-season turf begins breaking dormancy as soil temperatures reach about 55°F, but it isn't actively growing until the soil warms to roughly 65°F. As it greens up, make one early cleanup mow — cut a little lower than usual to clear matted dormant leaves and let sunlight reach the crowns, but no lower than about 0.75″ and never a hard scalp (that injures high-cut grasses like St. Augustine). Then mow at the normal height for your grass. Don't fertilize until it's about 50% green and actively growing — roughly when soil temperatures hold above ~65°F.

Timing: early April to late April

Apply a pre-emergent herbicide as soil temperatures climb through the low 50s°F — before they reach the ~55°F at which crabgrass germinates — to stop summer weeds before they start. A second application 6–8 weeks later extends control through the season.

⚠️Most pre-emergents block desirable grass seed as well as weed seed, so don't sow near one — though a few products (e.g. siduron, or mesotrione on labeled species) are made for use at seeding. Always check the label. Always read and follow the product label — it is the legal authority on rates, timing, and safety. These windows are regional estimates, not a prescription; defer to the label and your local extension office.

Timing: mid-May to early June

Make the first fertilizer application 2–4 weeks after full green-up, once the lawn is actively growing. Zoysia needs less nitrogen than bermuda — roughly 2–3 lbs per 1,000 sq ft per year, split across the summer growing season. Over-feeding accelerates thatch buildup without improving the lawn.

⚠️Resist the urge to push zoysia with extra nitrogen — excess feeding drives thatch, not color. Keep any single feeding at or below ~1 lb of nitrogen per 1,000 sq ft. Always read and follow the product label — it is the legal authority on rates, timing, and safety. These windows are regional estimates, not a prescription; defer to the label and your local extension office.

Timing: mid-May to early July

Core-aerate (and dethatch if the thatch layer is over about ½") during the peak growing season, when warm-season turf recovers fastest. Avoid aerating dormant or drought-stressed turf.

Timing: mid-June to early September

Summer is the warm-season growth peak. Zoysia needs less nitrogen than bermuda — roughly 2–3 lbs per 1,000 sq ft per year, split across the summer growing season. Over-feeding accelerates thatch buildup without improving the lawn. Spread the annual budget across the season rather than applying it all at once.

⚠️Never exceed ~1 lb of nitrogen per 1,000 sq ft in a single feeding. Always read and follow the product label — it is the legal authority on rates, timing, and safety. These windows are regional estimates, not a prescription; defer to the label and your local extension office.

Timing: mid-June to early September

Spot-treat broadleaf weeds during active growth, never on drought-stressed turf. Watch for insect and disease pressure in hot, humid weather and treat problem areas rather than the whole lawn.

Timing: late August to mid-September

Give a final feeding in early fall, then stop nitrogen — late-season nitrogen pushes tender growth into frost. Fall is also the best time to take a soil test so amendments are ready before spring.

⚠️Stop nitrogen about 6 weeks before your first expected frost. Always read and follow the product label — it is the legal authority on rates, timing, and safety. These windows are regional estimates, not a prescription; defer to the label and your local extension office.

Timing: early September to early October

A fall pre-emergent applied before soil cools below about 70°F controls winter annual weeds like Poa annua and henbit.

⚠️Always read and follow the product label — it is the legal authority on rates, timing, and safety. These windows are regional estimates, not a prescription; defer to the label and your local extension office.

Timing: late September to mid-October

For green color over winter dormancy, you can overseed with perennial ryegrass once soil cools below about 70°F. It's optional and adds maintenance — skip it if you're happy with a dormant, straw-colored lawn.

⚠️If you overseed, do not apply a fall pre-emergent — it will stop the ryegrass from germinating.

Timing: mid-October to early December

Wherever winter brings frost, expect a brown, dormant lawn from the first frost until spring green-up: hold off on fertilizer and pre-emergent, and give a light watering during extended winter drought to prevent desiccation. In the warmest, nearly frost-free areas (roughly USDA zone 10 — south Florida, coastal Southern California), the lawn often just slows down and stays partly green rather than going fully dormant; keep mowing and watering lightly as needed, and it can still use a little nitrogen or iron for winter color.