South Central region · warm-season lawns
Houston is warm-season grass country in its purest form, a humid subtropical (Koppen Cfa) corner of the Gulf Coast that almost never freezes hard. You sit in USDA zone 9a to 9b on the 2023 map, with the urban core running 9b and outer suburbs 9a, and a growing season that stretches close to 300 frost-free days. The average last spring frost lands around mid-to-late February (inland and north suburbs trend toward March 1), and the first fall frost holds off until late November or early December, so your grass is actively growing most of the year. Summers are long and brutally humid, with July and August highs of 93 to 95F and heat-index days well past 100F, while winters are mild, January lows averaging 43 to 44F. The catch is water: Houston is one of the wettest major US metros at roughly 50 inches of rain a year, concentrated in a soggy warm season from May through October. All of that falls on heavy coastal 'gumbo' clay (the Lake Charles and Beaumont series), an expansive, slow-draining soil that seals when wet, cracks when dry, and runs neutral to alkaline at pH 7.0 to 8.0. That drainage-plus-moisture combination is why your enemy here is disease and chinch bugs, not the drought that plagues drier Texas metros, and why the high-pH clay so often locks up iron and leaves St. Augustine yellow.
For take-all root rot, the spring decline disease that thins St. Augustine on Houston's high-pH gumbo, Texas A&M AgriLife Extension recommends topdressing with low-pH sphagnum peat moss at a rate of about one 3.8 cubic foot bale per 1,000 square feet, applied in spring and fall when the disease is active and watered in thoroughly so it reaches the soil surface. Lowering the pH right at the root zone is what suppresses the fungus, and AgriLife field trials found peat moss more effective long term than compost. On fertilizer, AgriLife's St. Augustine guidance is just as specific: make your first nitrogen application only after the lawn has been mowed at least twice in spring (that second mow confirms real growth), keep total nitrogen between 1 and 4 pounds per 1,000 square feet a year, and stop applying nitrogen 4 to 6 weeks before your historic first frost (so by mid-October here) to avoid pushing tender growth into the rare hard freeze.
Picked for Houston's climate and soil. Tap any grass for the full growing guide.
The Houston default, and for good reason. Most yards here have mature trees and humid, partly shaded beds, and St. Augustine handles that filtered shade better than any other warm-season grass while loving the Gulf Coast humidity and salt tolerance. Choose Floratam for full-sun lawns, or Palmetto and Raleigh where you need more shade tolerance. The honest tradeoffs: it is the favorite target of the southern chinch bug, it shows iron chlorosis on high-pH gumbo, and it is the most freeze-sensitive option when a rare Arctic outbreak drops you into the 20s F.
Read the St. Augustinegrass guideA dense, fine-bladed, lower-input alternative that takes foot traffic and moderate shade well, so it suits play areas and side yards that St. Augustine struggles with. Empire, Emerald, and Palisades all do well in the Houston heat and humidity. It greens up a bit later in spring than St. Augustine and is slower to fill in damage, but it needs less mowing and less babysitting through the wet summer, and it shrugs off chinch bugs far better than St. Augustine.
Read the Zoysiagrass guideThe pick for wide-open, full-sun Houston lawns with heavy traffic, like backyards with kids and dogs. Celebration, TifGrand, and common or hybrid types recover fast from wear and tolerate the heat with ease. The catch is sun: Bermuda thins out badly under the tree shade so common in older Houston neighborhoods, and its vigorous growth means more frequent mowing through a long warm season. In the wet spring and fall it can also pick up large patch, so watch the drainage.
Read the Bermudagrass guideA niche, low-input choice for large, sunny, unirrigated lots and rural acreage on the coastal prairie where you would rather not pour water and fertilizer into a lawn. It is tough and drought-hardy once established, but it is coarse-textured, throws up tall seed heads that demand frequent mowing, and looks too utilitarian for a polished front yard. Most irrigated Houston homeowners will be happier with St. Augustine or zoysia; buffalograss is another low-input option but dislikes the wet, humid Gulf Coast.
Read the Bahiagrass guideHouston soils warm earliest in the whole Gulf cohort, so your spring crabgrass pre-emergent goes down very early, late January into February, before the coastal ground hits the low 50s F. Miss that window and crabgrass and goosegrass are already germinating by the time you mow. Add a second application in September or October to block cool-season weeds like henbit and chickweed.
Most Houston yards sit on heavy "gumbo" clay (Lake Charles and Beaumont series on the coastal prairie) that seals when wet and cracks when dry. That slow drainage plus 50 inches of rain a year is exactly what nutsedge and dollarweed love, and the high-pH (7.0 to 8.0) gumbo is why St. Augustine here so often shows iron chlorosis and take-all root rot. The signature pest is the southern chinch bug, which hammers sunny, heat-stressed St. Augustine near driveways and curbs from June through September.
Twelve months tuned to our local season. Grouped by what the lawn is actually doing.
The lawn is dormant or barely growing through Houston's mild winter, and most of your work is done. Stay off the turf during the occasional hard freeze, when frozen blades are brittle and easily damaged. Service and sharpen the mower over the quiet season. Start watching the calendar and soil temperatures, because your very early crabgrass pre-emergent window opens again in just weeks, in late January, earlier than nearly anywhere else in the country.
Your warm-season lawn is dormant or semi-dormant in the mild Houston winter, often still tinged green during a warm spell. This is the month to get ahead of crabgrass: AgriLife's Gulf Coast timing puts your spring pre-emergent very early, so plan to apply by late January into February before the coastal soil warms into the low 50s F. Hold off on nitrogen entirely. If a hard Arctic freeze is forecast, water the lawn a day ahead, since moist soil holds heat and protects roots better than dry, cracked gumbo.
This is the heart of your pre-emergent window. Apply your crabgrass and goosegrass pre-emergent now if you did not in late January, because Houston soils warm earlier than almost anywhere else in the cohort. Check the timing with the soil-temperature tool rather than the calendar. Last spring frost averages mid-to-late February, a bit later in the northern suburbs, so the lawn is starting to think about waking up but is not actively growing yet. Still no nitrogen.
Spring green-up begins as soil temperatures climb. Watch closely for take-all root rot now, the classic Houston spring decline in St. Augustine: thin, yellowing patches that do not recover and roots that pull up short and dark. If you see it, this is the time to start the AgriLife peat moss topdressing program. Do not fertilize yet. Resist the urge to push nitrogen into a lawn that has only just started growing, since early feeding mostly feeds weeds and brown patch.
Once you have mowed at least twice, the lawn is truly growing and you can make your first nitrogen application of the year, per AgriLife guidance. Keep St. Augustine at a 3 to 4 inch mowing height to shade out weeds and conserve moisture. If your grass looks yellow-green between the veins on the high-pH gumbo, that is iron chlorosis, not a nitrogen shortage, so reach for a chelated iron or greensand product rather than more nitrogen. Continue any peat moss topdressing for take-all.
The wet warm season is underway and the lawn is growing fast. Watch for brown patch and large patch in the cool, moist transition, showing as circular yellow-to-brown rings, and improve drainage and ease off the water in affected spots. Scout for the first chinch bugs in sunny, hot areas near driveways, sidewalks, and curbs. With 50 inches of annual rain mostly arriving now, let rainfall do the work and only run irrigation during a genuine dry stretch. Use the watering-schedule tool to avoid the overwatering that feeds nutsedge and dollarweed.
Peak chinch bug season opens and runs hard through September. Inspect sunny, drought-stressed St. Augustine patches that look heat-burned but do not green up after watering, and use the float test or part the grass at the green margin to confirm. Make your second nitrogen application of the season if growth warrants. Mow weekly at the high end of the range, and never remove more than a third of the blade at once. Keep mower blades sharp, since ragged cuts on humid Gulf Coast turf invite gray leaf spot.
Full Houston summer, 93 to 95F highs and oppressive humidity. Chinch bugs are at their worst, so keep scouting the hottest, sunniest strips of the yard weekly. Gray leaf spot can flare in shady, over-fertilized, over-watered St. Augustine, so do not push extra nitrogen now and water deeply but infrequently in the early morning. Watch for fall armyworm activity beginning late in the month. Raise the mowing height slightly to help the lawn ride out the heat.
The hottest month, with highs near 95F. Stay on chinch-bug patrol and treat only the affected areas if you confirm them above threshold (roughly 20 to 25 bugs per square foot in the damaged area), rather than blanket-spraying the whole lawn. Scout for fall armyworms, which can strip a lawn almost overnight in late summer outbreaks; a soapy-water flush brings them to the surface to confirm. Keep watering early and deep, and resist late, heavy nitrogen that fuels disease in the humidity.
Chinch bug pressure finally eases as nights cool. Time your fall pre-emergent now through October to block cool-season weeds like henbit, chickweed, and annual bluegrass before they germinate, using the herbicide-timing tool to nail the date. Brown patch and large patch return with the cool, moist nights, so cut back on watering and watch for the telltale rings. This is also a good window to resume peat moss topdressing for take-all root rot.
Make your final nitrogen application no later than mid-October, which keeps you 4 to 6 weeks ahead of Houston's late-November first frost per AgriLife guidance, so you avoid pushing tender growth into the cold. A light potassium feeding now helps the lawn harden off for any winter freeze. Large patch is often most visible this month in the cool, wet weather. Keep mowing as long as the grass is actively growing, and rake or mulch falling leaves so they do not smother St. Augustine.
Growth slows sharply as the first fall frost arrives late in the month (average around November 29 to December 5). Drop the mower onto fallen leaves to mulch them rather than letting wet mats sit on the turf and invite disease. No more nitrogen. If a freeze is coming, a deep watering beforehand helps insulate the root zone in the heavy clay. This is your last real chance to address persistent perennial weeds like dollarweed and Virginia buttonweed before dormancy.
The issues we see most on local lawns, and how the timing works here.
Chinch bugs evolved alongside St. Augustine on the Gulf Coast and preferentially attack it, peaking in the hot, sunny, heat-stressed stretches from June through September. The damage almost always starts in the sunniest, most heat-stressed parts of the yard, near driveways, sidewalks, and south-facing curbs, and looks like irregular yellow-to-brown patches that fail to green up even after watering (which is why it is so often mistaken for drought). Confirm before you spray: part the grass at the edge of a dying patch and look for the small black-and-white adults and reddish nymphs, or push a bottomless can into the soil and fill it with water to float them up. Texas A&M AgriLife's treatment threshold is roughly 20 to 25 bugs per square foot, and you should spot-treat only the affected areas with a labeled insecticide rather than blanket-spraying. Keeping the lawn well watered and not over-fertilized makes it far less inviting in the first place.
Take-all root rot (TARR, caused by Gaeumannomyces) is a Houston signature disease, aggravated by the alkaline 7.0 to 8.0 gumbo clay so common here. It shows up in spring as yellowing, thinning patches that simply do not recover, with stolons that lift easily and roots that are short, dark, and rotted. Because it is a root-zone problem, foliar fungicides give poor results, so the cultural fix matters most. Texas A&M AgriLife recommends topdressing with low-pH sphagnum peat moss at about one 3.8 cubic foot bale per 1,000 square feet in spring and fall, watered in well, to acidify the surface and suppress the fungus. Also stop the things that feed it: avoid high nitrogen in early spring, improve drainage in the clay, and do not scalp or over-water the affected turf.
Both of these thrive on exactly what Houston has in abundance: 50 inches of rain a year falling on slow-draining clay, plus the overwatering many homeowners add on top. Yellow and purple nutsedge shoots up faster than the surrounding grass with a triangular stem you can feel by rolling it between your fingers, while dollarweed (pennywort) spreads bright round, coin-shaped leaves across the wettest, soggiest spots. The first and most durable fix is drainage and water discipline: fix low spots that pond, aerate the compacted clay, and stop watering on a calendar so the soil dries between irrigations. For chemical control, use a sedge-specific herbicide (halosulfuron or sulfentrazone) for nutsedge and a product labeled for dollarweed; both are perennials that regrow from tubers or rhizomes, so expect repeat applications.
Rhizoctonia solani is the most common turf disease in Houston, surfacing as circular yellow-to-brown rings or patches in spring and fall when nights are cool, mornings are heavy with dew, and the soil stays moist. It is a moisture-and-management disease, not a drought one, so the cure is mostly about drying the lawn out. Water only in the early morning so the blades dry quickly, never in the evening, and improve drainage and airflow in the affected areas. Avoid pushing nitrogen in spring and fall when the disease is active, since lush, soft growth is far more susceptible. If pressure is high in a chronically wet spot, a labeled lawn fungicide applied at the first sign of rings can slow it, but fixing the watering and drainage is what keeps it from coming back.
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Soil temperature for your city, so you time pre-emergent right.
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Deep, infrequent run times for your grass and soil.
Seed amounts for the right window.
Relieve compacted soil at the right time.
For most Houston yards, St. Augustinegrass is the default, and the reason is shade and humidity. So many homes here sit under mature trees that filtered shade is the rule, not the exception, and St. Augustine tolerates that better than any other warm-season grass while loving the Gulf Coast humidity and salt air. Pick Floratam for full sun and Palmetto or Raleigh for shadier yards. If you have a wide-open, full-sun lot with kids and dogs, Bermuda recovers from traffic faster, and if you want a lower-input, denser lawn that resists chinch bugs, zoysia is worth a look. Not sure what is already growing in your yard? Snap a photo and run it through our free grass identification at /diagnose before you make any changes.
Earlier than you probably think. Houston's coastal gumbo warms before almost anywhere else in the country, so your spring crabgrass pre-emergent should go down in late January into February, well ahead of the March timing many national guides quote. The trigger is soil temperature, not the calendar: you want it down before the soil hits the low 50s F, which is when crabgrass and goosegrass start to germinate. Then add a second application in September or October to block cool-season weeds like henbit, chickweed, and annual bluegrass. Our soil-temperature tool at /tools/soil-temperature tracks your local readings so you can hit the window precisely instead of guessing.
There are two common culprits, and they call for opposite responses. The first is iron chlorosis: Houston's high-pH gumbo clay (often 7.0 to 8.0) locks up iron, leaving blades yellow-green between the veins while the veins stay green. The fix is chelated iron or greensand, not more nitrogen, which would only make it worse. The second is take-all root rot, a spring disease where patches yellow, thin, and do not recover, with roots that pull up short and dark. That one calls for the peat moss topdressing program, not a fertilizer or iron product. If the yellowing is in a sunny spot near concrete and the grass crunches and stays brown after watering, suspect chinch bugs instead. When you feed, our /tools/fertilizer-calculator turns an iron or nitrogen target into the exact bag amount for your yard.
Less than most people do. With roughly 50 inches of rain a year, mostly in a soggy May-through-October warm season, the mistake here is overwatering, not underwatering, and chronically wet gumbo is exactly what feeds nutsedge, dollarweed, brown patch, and take-all root rot. During the wet season, let rainfall carry the lawn and only irrigate during a real dry stretch. When you do water, go deep and infrequent in the early morning so the blades dry fast, rather than light daily sprinkles. A good rule is about an inch of water per week including rain, applied in one or two soakings. Our /tools/watering-schedule tool converts that into exact runtimes for your sprinkler type and the slow-absorbing clay.
Usually yes, but not always, and that is worth planning for. Houston winters are mild, with January lows averaging 43 to 44F, so most years your warm-season lawn just goes semi-dormant and bounces back. The risk is the occasional Arctic outbreak that drops the metro into the 20s or low 30s F, and St. Augustine is the most freeze-sensitive of the common Houston grasses. A couple of things help: do not push nitrogen late in the season (stop by mid-October so you are not forcing tender growth into the cold), and if a hard freeze is forecast, water the lawn a day ahead, since moist soil holds heat and insulates the roots better than dry, cracked clay. If a severe freeze does brown the lawn out, be patient in spring; St. Augustine often regrows from surviving stolons even when the top looks dead.
