Lawn Care Guide for St. Bernard Parish
St. Bernard Parish, Louisiana
Data Story
About Lawn Care in St. Bernard Parish, Louisiana
Strong Lawn Potential in St. Bernard
With a lawn score of 46.1, St. Bernard Parish is among the easier places in Louisiana to maintain a lawn. The parish sits comfortably above the state average of 33.8 and is very close to the national median of 50.0.
Mild Heat and High Growing Potential
St. Bernard averages only 55 extreme heat days, far fewer than the state average of 84. This milder climate, paired with 6,979 growing degree days, provides a long and productive season for Zone 9b lawns.
Ideal pH in Heavy Clay Soil
The soil pH of 6.71 is nearly perfect for most lawn types, falling squarely in the ideal 6.0 to 7.0 range. However, the high clay content of 43.2% means you must manage potential compaction and drainage issues carefully.
Managing Dry Weeks in the Delta
The parish experienced 18 weeks in drought over the last year, and 34.5% of the area is currently in severe drought. To combat these dry periods, use mulch-mowing techniques to retain moisture in your high-clay soil.
Long Growing Season in Zone 9b
With the last spring frost typically arriving by February 4, you have an exceptionally long window for lawn care. St. Augustine grass is a top performer here, benefiting from the ideal pH and the parish's coastal climate.
Lawn Difficulty Score
Recommended Grasses
Bermudagrass
Cynodon dactylon
Climate Snapshot
Annual Precip
N/A
Growing Degree Days
6,979.1
Base 50F
Last Spring Frost
02/04
First Fall Frost
12/15
Days Above 95F
55
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
1.6"
inches of water
Monthly Water
4,836
gallons
Estimated Monthly Cost
$38.69
at $0.008/gallon average
Estimates based on 30" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in St. Bernard Parish
Heavy Clay Soil
Clay content of 43% leads to poor drainage and soil compaction. Core aeration 1-2 times yearly and topdressing with compost can improve root growth.
Learn more about regional lawn challenges at The Lawn Report.
Want detailed soil composition, drainage classes, and soil series data? View soil details on SoilByCounty.com
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.
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