Lawn Care Guide for Terrebonne Parish
Terrebonne Parish, Louisiana
USDA SSURGO / PHZMData Story
About Lawn Care in Terrebonne Parish, Louisiana
Terrebonne's coastal lawn struggle
Terrebonne Parish scores a 29.3 on the difficulty scale, making it tougher than the state average. This Zone 9b region faces unique coastal challenges that require a specialized approach to turf management.
High humidity and steady rain
The parish receives 65.4 inches of rain annually, which can saturate the soil and stress root systems. However, with 76 extreme heat days, it stays slightly cooler than the 84-day state average.
Heavy clay and acidic baseline
A high clay content of 40.7% can lead to significant drainage issues and soil compaction. The pH of 5.44 is below the ideal range, so testing for lime requirements is a critical first step for any new lawn.
Total parish under severe drought
Currently, 100% of Terrebonne is in severe drought, a critical situation for local landscapes. Efficient irrigation is a must, as the parish saw 12 weeks of drought over the past year.
Plant early in the year
Zone 9b allows for an early start, with the last frost usually occurring by February 5. St. Augustine grass is highly recommended here for its salt tolerance and ability to handle heavy clay.
Lawn Difficulty Score
Top Grass Fit for Terrebonne Parish
Excellent match
Pennington Zenith Zoysia Grass Seed & Mulch
Pennington
Top cultivar score: 86/100
Zone 9b vs Zoysiagrass's 6–9 band.
Soil pH 5.4438953209557 vs Zoysiagrass's 6–6.5 window.
Precipitation 65.42" + soil AWC vs Zoysiagrass's 20–30" need.
Growing-degree-days + frost window vs a advanced-difficulty establishment.
Zenith Zoysia occupies a unique position in the grass seed market: it's essentially the only Zoysia variety widely available as seed. Most Zoysia (Emerald, Zeon, Innovation) is sold as sod or plugs at $300-500+ per 1,000 sq ft.
Limited product coverage — one vetted cultivar for this species.
Shop Pennington Zenith Zoysia Grass Seed & MulchIn Terrebonne Parish, USDA zone 9b, soil pH 5.4, Pennington Zenith Zoysia Grass Seed & Mulch scores 86/100 — a strong zone match, adequate moisture, and a long enough establishment window.
Why we ruled these out
- Outsidepride Midnight Kentucky Bluegrass Seed — USDA zone 9b is above Outsidepride Midnight Kentucky Bluegrass Seed's effective range (2–8); not recommended for this county.
See our fit-score methodology for how survivability is determined.
Recommended Grasses
Bermudagrass
Cynodon dactylon
Best Grass Seed for Terrebonne Parish
Zone 9b • Warm-season grasses thrive here.
Find Seeds for Zone 9bClimate Snapshot
Annual Precip
65.4"
Growing Degree Days
7,350
Base 50F
Last Spring Frost
02/05
First Fall Frost
12/17
Days Above 95F
76
Hardiness Zone
9b
Seeding Calendar — Zone 9B
Seasonal Lawn Care Checklist
Spring
- Apply pre-emergent herbicide when soil reaches 55F
- Begin mowing when grass reaches 3 inches
- Start irrigation if rainfall is below 1 inch/week
- Soil test every 2-3 years — adjust lime or sulfur as needed
Summer
- Raise mowing height to reduce heat stress
- Water deeply 1-2 times per week (1 inch total)
- Avoid fertilizing cool-season grasses in peak heat
- Scout for grubs and treat if >10 per sq ft
Fall
- Overseed warm-season lawns if thinning
- Apply fall fertilizer (highest N application for cool-season)
- Continue mowing until growth stops
- Rake or mulch leaves to prevent smothering
Winter
- Apply pre-emergent for winter weeds
- Service mower and sharpen blades
- Plan spring soil amendments based on fall test
- Overseed with ryegrass for winter color
Watering Deficit Calculator
Monthly Deficit
0.0"
inches of water
Monthly Water
0
gallons
Estimated Monthly Cost
$0.00
at $0.008/gallon average
Estimates based on 65" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Terrebonne Parish
Excess Moisture & Fungal Disease
High annual rainfall (65 inches) increases risk of fungal diseases like brown patch and dollar spot. Ensure good drainage and avoid overwatering.
Heavy Clay Soil
Clay content of 41% leads to poor drainage and soil compaction. Core aeration 1-2 times yearly and topdressing with compost can improve root growth.
Acidic Soil
Soil pH of 5.4 is below the ideal range for most grasses (6.0-7.0). Apply agricultural lime to raise pH gradually.
Learn more about regional lawn challenges at The Lawn Report.
Lawn Care Advisory: Terrebonne Parish
Lawn Verdict
Terrebonne Parish is in USDA hardiness zone 9b, a warm zone well-suited to heat-tolerant grasses. with winter lows reaching around 25.0°F. and 7,350 growing degree days annually, supporting vigorous warm-season lawns. High annual precipitation (65.4 inches) supports lush growth but increases disease pressure.
Seasonal Breakdown
Wait until after February 5 to seed or overseed; soil temperatures should consistently reach 50-55°F. Summers are warm (July averages 82.7°F); monitor for heat stress and water when soil is dry 2-3 inches down. With 76.1 days above 90°F annually, warm-season grasses recover faster from summer stress than cool-season types. Aerate and overseed cool-season lawns by early fall, well before December 17; this is the best renovation window. Mild winters (January averages 53.7°F) allow year-round mowing for warm-season lawns and minimal dormancy.
Watering Guidance
Terrebonne Parish receives abundant rainfall (65.4 inches annually), so lawns rarely need supplemental irrigation. Currently, 100.0% of the county is in severe drought according to the US Drought Monitor. Mandatory watering restrictions may be in effect; follow local guidelines and prioritize tree and shrub watering over turf. Standard warm-season watering of 1 inch per week is usually adequate during summer. High heat accumulation means warm-season grasses use water aggressively — monitor soil moisture regularly.
Regional Context
Terrebonne Parish is close to the Louisiana average temperature, it is somewhat wetter than the state average, the growing season is noticeably longer than the state average, USDA zone 9b helps guide grass selection compared to neighboring counties.
Want detailed soil composition, drainage classes, and soil series data? View soil details on SoilByCounty.com
Frequently Asked Questions
What USDA hardiness zone is Terrebonne Parish in?
What is the best grass for Terrebonne Parish?
How much rainfall does Terrebonne Parish get?
What is the soil pH in Terrebonne Parish?
Data sourced from USDA SSURGO, NOAA Climate Normals (1991-2020), USDA Plant Hardiness Zone Map, and US Drought Monitor. Lawn difficulty scores and grass recommendations are estimates for informational purposes only.
Explore more data for Terrebonne Parish