Bermuda Grass vs St. Augustine Grass in Florida

National recommendation: For Florida and coastal Texas: St. Augustine if you have shade. Bermuda if you have full sun and want lower maintenance overall, especially under the 2026 SWFWMD Phase III water restrictions that make St. Augustine's 1.5-inch weekly need hard to meet.

Bermuda Grass and St. Augustine Grass in Florida: What the Climate Decides

Under SWFWMD Phase III 2026 restrictions (one day per week watering), Bermuda's 1-inch weekly water requirement is easier to meet than St. Augustine's 1.5-inch need. Tampa, Sarasota, and Bradenton homeowners are seeing St. Augustine thin in 2026. Coastal Florida still favors St. Augustine for salt tolerance.

Florida spans USDA zones 8a–11a with a humid-subtropical to tropical climate. Green-up in most of the state occurs February (south Florida), March (central/north Florida), and dormancy runs brief December–January in North Florida; South Florida grows year-round. Both Bermuda Grass and St. Augustine Grass are dominant choices in parts of the state — the right one for your lawn depends on local shade, soil, water budget, and traffic.

Bermuda Grass vs St. Augustine Grass: Which Climate Wins?

Bermuda and St. Augustine both perform in USDA Zones 8b through 10b, but they fill different microclimate niches. St. Augustine's optimal range is the humid subtropical Gulf Coast, Houston east through New Orleans, Mobile, Tampa, and South Florida, with humidity routinely above 70% and 50+ inches of annual rainfall. Bermuda dominates drier portions of the same zones, Dallas, Austin, San Antonio, Phoenix, and inland Florida, where humidity is lower and rainfall is more variable. The 2026 drought situation has shifted the balance: under SWFWMD Phase III restrictions in Florida (one watering day per week) and Stage 2 to 3 restrictions across Texas, St. Augustine's 1.5-inch weekly water requirement is increasingly unmeetable while Bermuda's 1-inch requirement is reachable. Many full-sun Florida and Texas homeowners are converting from St. Augustine to Bermuda specifically because of water restrictions, not because of personal preference.

The critical dividing line between Bermuda and St. Augustine is shade tolerance. In Houston's tree-lined suburban lawns, St. Augustine dominates. In Phoenix's open sun landscapes, Bermuda is universal. The Florida coast represents the most contested territory, beachfront properties with full sun often use Bermuda for its traffic tolerance, while most residential lots with mature trees use St. Augustine. In Texas, North Texas (Dallas, Fort Worth) sees Bermuda dominate open lawns, while South Texas (San Antonio, Austin) increasingly uses St. Augustine where irrigation is available to handle the extended heat.

Cost to Establish and Maintain

Establishment cost favors Bermuda by a wide margin. Bermuda from seed costs $0.05 to $0.15 per square foot, a fraction of any other warm-season option. Common Bermuda sod costs $0.30 to $0.50 per square foot installed. St. Augustine is sod-only (no seed available) at $0.50 to $1.00 per square foot installed, or plugs at $0.30 to $0.60 each on 12-inch centers requiring 4 to 6 months for full coverage. For a 5,000-square-foot lawn, the establishment cost difference is typically $1,500 to $2,500 in favor of Bermuda. Annual maintenance favors Bermuda as well: lower water bills under restrictions, lower fertilizer cost (3 to 4 lb N vs St. Augustine's 3 to 4 lb N, roughly equal, but St. Augustine often needs supplemental iron and chinch bug treatments adding $50 to $200 per year). The 10-year total cost of ownership for Bermuda is typically 30 to 40 percent lower than St. Augustine for equivalent lawn area in Florida and Texas.

5-Year Cost Comparison (5,000 sq ft lawn): • Sod installation: Bermuda $700–$1,200 vs St. Augustine $900–$1,500 • Annual fertilizer: Bermuda $80–$150 vs St. Augustine $120–$200 • Annual irrigation: Bermuda $200–$400 vs St. Augustine $300–$500 • Annual pest control: Bermuda $50–$150 vs St. Augustine $100–$250 • Annual mowing: Bermuda $600–$900 vs St. Augustine $500–$800 • 5-year total: Bermuda $4,230–$7,150 vs St. Augustine $5,100–$8,750 St. Augustine's higher ongoing costs reflect its greater fertilizer and pest management needs. Chinch bugs alone cost Florida homeowners an estimated $40M+ annually.

Annual Maintenance Compared

Bermuda requires weekly mowing at 1 to 1.5 inches; St. Augustine requires bi-weekly mowing at 3 to 4 inches. The mowing time is actually similar (Bermuda mows faster but more often) but St. Augustine's tall mowing height makes mulching mowers struggle and bagging more common. Bermuda's pest pressure is low, occasional armyworm and grub treatments. St. Augustine's pest pressure is high: chinch bugs require monthly inspection from May through September with insecticide treatment as needed (typical homeowner cost: $50 to $200 per year), brown patch fungus requires fungicide application 2 to 3 times per season in humid climates ($30 to $80 per application), and gray leaf spot affects Floratam and similar cultivars. Edging is more aggressive on Bermuda (weekly during growing season) than St. Augustine (every 2 to 3 weeks).

Side-by-Side Appearance

Visually, the two species are dramatically different. St. Augustine's broad, coarse blades (4 to 8 mm wide) produce a tropical, lush appearance with the largest leaf surface of any common lawn grass. Mowed at 3 to 4 inches, St. Augustine looks soft and luxuriant. Bermuda's fine to medium blades (1 to 3 mm wide) and short mowing height (1 to 1.5 inches) produce a manicured, golf-course appearance, visually 'tighter' and more refined. Color: St. Augustine is bright lime-green to medium green; Bermuda is medium green to dark green with hybrid varieties producing the deepest color. Texture underfoot: St. Augustine is soft and forgiving (better for bare feet and dogs); Bermuda is firmer and denser. For a tropical Florida or Hawaii look, St. Augustine wins; for a clean Southwestern or Southern manicured look, Bermuda wins.

How to Switch Between Bermuda Grass and St. Augustine Grass

Switching from St. Augustine to Bermuda is straightforward. Step 1 (April-May): Apply glyphosate at 2x label rate to the entire lawn. Wait 4 weeks. Step 2: Apply second glyphosate treatment to any survivors. Step 3 (May-June): Once all green tissue is dead, prepare seedbed by raking and adding compost as needed, then seed Bermuda at 1 to 2 lb per 1,000 sq ft. The new Bermuda lawn establishes in 60 to 90 days, with full coverage in one growing season. The reverse switch (Bermuda to St. Augustine) is significantly harder because Bermuda's aggressive rhizomes re-establish through any St. Augustine sod gaps. Plan on 2 to 3 years of glyphosate spot treatments to fully eliminate Bermuda from a converted St. Augustine lawn. Most landscape professionals discourage attempting to convert Bermuda to St. Augustine specifically because of this re-establishment problem.

Switching from St. Augustine to Bermuda (common in drought-prone areas): Kill existing St. Augustine in summer with glyphosate (requires 2–3 applications 2 weeks apart, St. Augustine stolons are persistent). Till lightly, level, and either sod or seed with hulled Bermuda seed in late May. Switching from Bermuda to St. Augustine (for shade): Bermuda will not disappear easily. Till to 10cm, remove as much stolon material as possible, and install St. Augustine sod in spring. Bermuda will attempt to reinvade, spot treat with fluazifop for 1–2 seasons.

Common Mistakes When Choosing Between Bermuda Grass and St. Augustine Grass

The biggest mistake homeowners make is planting Bermuda in partial shade. Bermuda needs 8+ hours of direct sun, anything less produces thin, patchy turf that weeds exploit immediately. If your lawn has mature trees or north-facing exposures, St. Augustine or Zoysia is the correct choice regardless of what your neighbor is growing.

The second common mistake: planting St. Augustine in the wrong climate. North of Zone 8 (Atlanta, Charlotte, Nashville), St. Augustine struggles through cold winters and emerges patchy in spring. In Zone 7, use Zoysia instead, it handles the same conditions with better cold tolerance.

Third mistake: overwatering Bermuda. Bermuda's aggressive root system accesses deep soil moisture that most homeowners don't realise is available. Deep, infrequent watering (once per week to 6-inch depth) produces a stronger lawn than frequent shallow irrigation.