If your yard sits under live oaks or gets broken shade for part of the day, plant St. Augustine. If it bakes in full sun and takes real foot traffic, plant Bermuda. In San Antonio, sunlight decides this matchup more than anything else.
The short answer, expanded
Both grasses handle our heat. That part isn’t the question. St. Augustine, Bermuda, and Zoysia all get grown successfully across the metro, so you’re choosing between proven options, not gambling on an experiment. The real differences show up in shade tolerance, water appetite, traffic recovery, and how much mowing you’re willing to sign up for.
Shade is the deciding factor
Bermuda is a sun worshipper. Texas A&M AgriLife Extension guidance puts its light requirement at roughly six or more hours of direct sun per day, and it thins out fast when it gets less. St. Augustine tolerates filtered shade better than any other warm-season turf commonly planted here, which is why you see it holding on under mature oaks all over the older neighborhoods.
Do a simple test before you buy anything. Walk the yard at mid-morning, early afternoon, and late afternoon on a clear day and note where the shadows fall. If big sections stay shaded, Bermuda will disappoint you there no matter how well you water it.
Water use and SAWS rules
Neither grass is a cactus. An established warm-season lawn typically wants somewhere around an inch of water a week during peak summer, per AgriLife guidance, counting rain and irrigation together. St. Augustine tends to show drought stress sooner, with blades that fold and go gray. Bermuda handles dry spells differently, going dormant and brown, then greening back up when water returns.
SAWS runs stage-based watering rules tied to aquifer levels, and under drought stages sprinkler use drops to one assigned day per week. Check the current SAWS stage before you plan a new lawn, because restrictions shift and the rules on the day you plant matter. Edwards Aquifer sensitivity sits behind all of it. If the watering math is what worries you most, read our comparison of xeriscape vs a traditional lawn before committing to either grass.
Thin soil over limestone
Much of the metro, especially out toward the Hill Country edge, has thin soil sitting right on top of limestone. A shallow root zone dries out quickly and heats up fast, which punishes any turf. Both grasses can succeed on these sites, but prep matters more than variety. Bringing in a few inches of quality topsoil before sodding gives roots somewhere to live and stretches the time between waterings.
Mowing and upkeep
AgriLife Extension recommends mowing St. Augustine at roughly 2.5 to 4 inches, while Bermuda performs best kept down around 1 to 2 inches. That difference matters in practice. Bermuda cut low looks like a golf fairway but demands frequent mowing in summer, and it aggressively runs into flower beds and sidewalk cracks. St. Augustine mows less often and taller, though it brings its own headaches, mainly chinch bug pressure in hot, dry stretches.
Traffic and recovery
Bermuda spreads by runners above and below the soil surface and repairs bare spots quickly, which makes it the pick for yards with kids, dogs, or a regular backyard game. St. Augustine fills in too, but slower, and a worn path through it takes longer to heal.
The verdict and the money question
Shade or mixed light, go St. Augustine. Full sun with traffic, go Bermuda. St. Augustine is installed as sod, while Bermuda can go in as sod or seed, and installed costs vary enough by yard size and prep that it’s worth checking real numbers in our San Antonio landscaping cost guide. If you’d rather have someone read your actual light and soil before you order pallets, San Antonio Pro Landscape does on-site assessments across the metro.
FAQ
Can St. Augustine and Bermuda coexist in the same yard?
They can, but not peacefully. Bermuda invades St. Augustine in sunny areas, and St. Augustine shades out Bermuda in low light. Most mixed yards drift toward whichever grass the conditions favor, so it’s cleaner to zone them deliberately or commit to one.
When should I install new grass in San Antonio?
Warm-season grasses establish best when soil is warm, so late spring through early fall is the working window. Confirm the current SAWS watering stage first, since new sod needs consistent moisture during its first weeks and stage rules change with drought conditions.
Which grass survives drought restrictions better?
Bermuda, generally. It goes dormant under stress and recovers when watering resumes. St. Augustine has less of a survival mode and can thin permanently after a hard, dry summer with one-day-per-week watering, though results depend on soil depth and shade.
“@context”: “https://schema.org”, “@type”: “FAQPage”, “mainEntity”: [ { “@type”: “Question”, “name”: “Can St. Augustine and Bermuda coexist in the same yard?”, “acceptedAnswer”: { “@type”: “Answer”, “text”: “They can, but not peacefully. Bermuda invades St. Augustine in sunny areas, and St. Augustine shades out Bermuda in low light. Most mixed yards drift toward whichever grass the conditions favor, so it’s cleaner to zone them deliberately or commit to one.” } }, { “@type”: “Question”, “name”: “When should I install new grass in San Antonio?”, “acceptedAnswer”: { “@type”: “Answer”, “text”: “Warm-season grasses establish best when soil is warm, so late spring through early fall is the working window. Confirm the current SAWS watering stage first, since new sod needs consistent moisture during its first weeks and stage rules change with drought conditions.” } }, { “@type”: “Question”, “name”: “Which grass survives drought restrictions better?”, “acceptedAnswer”: { “@type”: “Answer”, “text”: “Bermuda, generally. It goes dormant under stress and recovers when watering resumes. St. Augustine has less of a survival mode and can thin permanently after a hard, dry summer with one-day-per-week watering, though results depend on soil depth and shade.” } } ] }SCRIPT