Last updated:
Last verified: October 6, 2026, against San Antonio Water System (SAWS).
How do you care for a lawn in San Antonio’s heat and drought?
Caring for a San Antonio lawn is about surviving extreme heat and Edwards Aquifer (SAWS) drought restrictions. The keys: choose a warm-season, drought-tough grass (Buffalo grass or Bermuda, or St. Augustine for shade); mow high (St. Augustine 3.5-4 inches) to shade the roots; water deeply but only on your SAWS-assigned day – currently once a week under Stage 3; and never fertilize drought-stressed turf. Improve the thin, alkaline limestone and caliche soil with compost and mulch so it holds moisture. The goal is a resilient lawn that survives San Antonio summers within the watering rules, not a thirsty one that browns out between waterings.
Source: Texas A&M AgriLife / SAWS. Updated 2026-06-16.
| Task | San Antonio heat & drought approach |
|---|---|
| Grass choice | Buffalo grass or Bermuda (low water); St. Augustine for shade |
| Mowing height | Mow high (St. Augustine 3.5-4 in) to shade soil and roots |
| Watering | Deep, on your SAWS day only (once/week under Stage 3); hand-water new areas |
| Fertilizing | After spring green-up and by mid-September; never on stressed turf |
| Soil | Add compost + mulch over thin alkaline caliche/limestone to hold moisture |
| Pests | Watch chinch bugs (hot, dry St. Augustine) and grubs |
| Drought stress | Footprints that stay, blue-gray color = water on your next legal day |
How do you keep a San Antonio lawn green during drought restrictions?
Under SAWS once-a-week watering, the trick is efficiency, not more water: water deeply on your assigned day (the legal 5-10 a.m. window soaks in best), mow high to shade the soil, and choose a drought-tough grass like Buffalo grass or Bermuda. Mulch beds and add compost so the thin soil holds moisture, hand-water only truly dry spots, and accept a little summer dormancy. A resilient lawn beats a thirsty one in a Stage 3 year. If your sprinklers can’t deliver a deep soak in that one window, our irrigation service in San Antonio can check coverage and reset the controller before the heat peaks.
How high should you mow your lawn in San Antonio’s heat?
Mow on the high side in San Antonio – St. Augustine at about 3.5-4 inches, Zoysia and Bermuda a bit lower – and never remove more than one-third of the blade at once. A taller canopy shades the soil, slows evaporation, keeps roots cooler, and crowds out weeds, all of which matter under once-a-week watering. Keep the mower blade sharp; ragged cuts stress an already heat-stressed lawn.
Why is my San Antonio lawn dying in summer?
The usual culprits are drought stress (too little water under the once-a-week limit), chinch bugs (expanding brown patches in hot, sunny St. Augustine), or grubs. Rule out chinch bugs first by parting the grass at a green-to-brown edge and looking for small insects. Deep watering on your legal day, a drought-tough grass, and mulched soil prevent most summer decline; confirm pests before treating.
Should you fertilize a San Antonio lawn in summer?
Avoid fertilizing San Antonio lawns in the heat of summer, especially drought-stressed turf – it forces growth the lawn can’t water and can burn it under the once-a-week limit. Feed after spring green-up (around April) and give a final feeding by mid-September. In the alkaline soil, a yellowing lawn usually needs iron, not nitrogen, so a soil test saves money and avoids stressing the grass.
What is the lowest-maintenance lawn for San Antonio?
For the least water and upkeep in San Antonio, Buffalo grass is the lowest-maintenance choice – a Texas native that survives on minimal irrigation in full sun. Pair it with mulched, compost-improved soil and you have a lawn built for drought restrictions. Bermuda is a tougher, more traffic-tolerant low-water option; St. Augustine is higher-maintenance but the go-to for shade. Match the grass to your light and water goals.